toothbrush

Abstract

To provide a toothbrush capable of more effectively cleaning gaps between teeth and between teeth and gums, reducing problems such as incomplete brushing due to user habits, and contributing to improvement of tooth brushing accuracy. [Solution] The toothbrush set 1 comprises a first toothbrush 2A and a second toothbrush 2B. The first toothbrush 2A has a toothbrush body 5 having a long handle 3 and a bristle section 4 formed at the tip of the handle 3, and a brush section 8A composed of multiple central bristle bundles 6a and multiple side bristle bundles 7a. The second toothbrush 2B has a toothbrush body 5 having a long handle 3 and a bristle section 4 formed at the tip of the handle 3, and a brush section 8B composed of multiple central bristle bundles 6b and multiple side bristle bundles 7b. The tips of the brush section 8A of the first toothbrush 2A and the brush section 8B of the second toothbrush 2B are shaped so that a curved convex portion and a curved concave portion are connected in the longitudinal direction of the handle 3.

Description

[Technical Field]

[0001] This invention relates to a toothbrush that uses bristles attached to the tip of the handle to remove plaque and other dirt from teeth. [Background technology]

[0002] A toothbrush generally consists of a handle that is long and easy to grip, and a brush head with bristles attached to the end of the handle. By gripping and moving the handle, the tip of the brush head at the end of the handle comes into contact with the teeth, removing plaque and other dirt that has accumulated on the teeth.

[0003] Recently, the issue has become how to efficiently remove not only dirt on the surface of the teeth, but also dirt that resides between the teeth (interdental spaces), at the borders between the teeth and gums, in the grooves of the teeth, etc. To address this issue, there are toothbrushes with bristles designed to efficiently reach between the teeth.

[0004] For example, the toothbrush described in Patent Document 1 has a brush head that is generally mountain-shaped when viewed from the side. In other words, the brush head is cut so that it gradually becomes taller as it approaches the center. This makes it easier for the peaks of the mountain-shaped brush head to reach between teeth, the gaps between the teeth and gums (so-called periodontal pockets), and the grooves in the teeth, compared to brush heads with a flat surface.

[0005] However, even if the tip of the brush part is simply formed to have an overall mountain shape when viewed from the side, it may not be possible to effectively clean plaque in the grooves between the teeth or in the gaps between the teeth and gums.

[0006] Furthermore, when brushing teeth with a toothbrush, each person has their own brushing habits, so it is easy to leave the same areas unbrushed. Since people rarely pay attention to such habits when brushing their teeth on a daily basis, it is difficult to improve problems such as leaving teeth unbrushed due to individual differences in habits. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-075725 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was made in consideration of the above points, and its purpose is to provide a toothbrush that can more effectively clean between teeth and the gaps between the teeth and gums by brushing for a short time and with light pressure.

[0009] Another object of the present invention is to provide a toothbrush that can reduce problems such as leaving areas unbrushed due to user habits and contribute to improving tooth brushing accuracy. [Means for solving the problem]

[0010] In order to achieve the above object, the toothbrush (2A, 2B) of the present invention has a long handle (3), a bristle section (4) formed at the tip of the handle (3), and a brush section (8A, 8B) consisting of multiple bristle bundles (6a, 7a, 6b, 7b) planted in the bristle section (4), and is a toothbrush that cleans teeth (T) using the brush section (8A, 8B), and is characterized in that the tip of the brush section (8A, 8B) has a shape in which a curved convex section and a curved concave section are connected in the longitudinal direction of the handle (3).

[0011] According to the toothbrush of the present invention, the tip of the brush head has a shape in which a curved convex portion and a curved concave portion are connected together, so the difference in brushing function between the curved convex portion and the curved concave portion can reduce missed spots and poor brushing due to user habits, thereby improving tooth brushing accuracy.

[0012] In addition, in the toothbrush (2A) described above, the brush portion (8A) may have, as bristle bundles, a plurality of central bristle bundles (6a) arranged in a line in the longitudinal direction of the handle (3) and a plurality of side bristle bundles (7a) arranged adjacent to and surrounding the plurality of central bristle bundles (6a), and the side bristle bundles (7a) each comprise a smoothly curved convex portion (7aC) at the longitudinal tip side of the brush portion (8A) and a smoothly curved concave portion (7aR) at the rear end side that is continuous with the curved convex portion (7aC), and the central bristle bundles (6a) each comprise a smoothly curved convex portion (6aC) at the longitudinal tip side of the brush portion (8A) and a smoothly curved concave portion (6aR) at the rear end side that is continuous with the curved convex portion (6aC), and the curved convex portion (6aC) of the central bristle bundle (6a) may have longer bristles than the curved convex portions (7aC) of the side bristle bundles (7a). This allows the central bristle bundle to penetrate deep into the teeth, while the side bristle bundles hit the periphery later, improving the accuracy of cleaning interdental spaces and the like.

[0013] In addition, in the toothbrush (2A) described above, the brush portion (8A) may have, as bristle bundles, a plurality of central bristle bundles (6a) arranged in a line in the longitudinal direction of the handle (3) and a plurality of side bristle bundles (7a) arranged adjacent to and surrounding the plurality of central bristle bundles (6a), and the side bristle bundles (7a) are each composed of a smoothly curved convex portion (7aC) at the longitudinal tip side of the brush portion (8A) and a smoothly curved concave portion (7aR) at the rear end side that is continuous with the curved convex portion (7aC), and the central bristle bundles (6a) are each composed of a smoothly curved convex portion (6aC) at the longitudinal tip side of the brush portion (8A) and a smoothly curved concave portion (6aR) at the rear end side that is continuous with the curved convex portion (6aC), and the curved concave portion (6aR) of the central bristle bundle (6a) may have shorter bristles than the curved concave portions (7aR) of the side bristle bundles (7a). This allows the curved recesses of the central tufts, which have not yet sagged, to come into contact with the curved recesses of the side tufts in a stepwise manner, thereby improving cleaning accuracy.

[0014] Furthermore, the toothbrush (2A) may be configured so that the central bristle bundle (6a) and the side bristle bundles (7a) are different colors, which makes it easy to obtain the optimal angle for brushing the gum gap and surrounding areas.

[0015] In addition, in the toothbrush (2B) described above, the brush portion (8B) may have, as bristle bundles, a plurality of central bristle bundles (6b) arranged in a line in the longitudinal direction of the handle (3) and a plurality of side bristle bundles (7b) arranged adjacent to and surrounding the plurality of central bristle bundles (6b), and the side bristle bundles (7b) each comprise a smoothly curved recess (7bR) at the longitudinal tip side of the brush portion (8B) and a smoothly curved convex portion (7bC) at the rear end side that is continuous with the curved recess (7bR), and the central bristle bundles (6b) each comprise a smoothly curved recess (6bR) at the longitudinal tip side of the brush portion (8B) and a smoothly curved convex portion (6bC) at the rear end side that is continuous with the curved recess (6bR), and the curved convex portion (6bC) of the central bristle bundle (6b) may have longer bristles than the curved convex portions (7bC) of the side bristle bundles (7b). This allows the central bristles to penetrate deeper into the teeth, while the side bristles are slower to reach the periphery, improving the accuracy of cleaning interdental spaces and the like.

[0016] In addition, in the toothbrush (2B) described above, the brush portion (8B) may have, as bristle bundles, a plurality of central bristle bundles (6b) arranged in a line in the longitudinal direction of the handle (3) and a plurality of side bristle bundles (7b) arranged adjacent to and surrounding the plurality of central bristle bundles (6b), and the side bristle bundles (7b) are composed of a smoothly curved recess (7bR) at the longitudinal tip side of the brush portion (8B) and a smoothly curved convex portion (7bC) at the rear end side that is continuous with the curved recess (7bR), and the central bristle bundles (6b) are composed of a smoothly curved recess (6bR) at the longitudinal tip side of the brush portion (8B) and a smoothly curved convex portion (6bC) at the rear end side that is continuous with the curved recess (6bR), and the curved recess (6bR) of the central bristle bundle (6b) may have shorter bristles than the curved recesses (7bR) of the side bristle bundles (7b). This allows the curved recesses of the central tufts, which have not yet sagged, to come into contact with the curved recesses of the side tufts in a stepwise manner, thereby improving cleaning accuracy.

[0017] Furthermore, the toothbrush (2B) may be configured so that the central bristle bundle (6b) and the side bristle bundles (7b) are different colors, which makes it easy to obtain the optimal angle for brushing the gum line and its surrounding areas.

[0018] Furthermore, in the toothbrush set (1) of the present invention, when one of the brushes is the first toothbrush (2A) and the other is the second toothbrush (2B), when the brush head (8A) of the first toothbrush (2A) and the brush head (8B) of the second toothbrush (2B) are butted together with their tips facing each other, the surface of the bristles of the brush head (8A) of the first toothbrush (2A) and the surface of the bristles of the brush head (8B) of the second toothbrush (2B) may be configured to coincide. In this way, the tip of the brush head has a shape in which the curved convex portion and the curved concave portion are connected, and the curved convex portion and the curved concave portion are reversed, so that the difference in brushing function can reduce missed spots and poor brushing due to user habits, thereby improving tooth brushing accuracy.

[0019] Furthermore, the toothbrush set (1) may be configured so that when the bristles are butted together with their tips facing each other, the tips of the side bristles (7a, 7b) and the tips of the central bristles (6a, 6b) coincide with each other. This allows for differences in brushing function based on the inverse concave-convex structure to reduce missed spots and imperfect brushing due to user habits, thereby improving tooth brushing accuracy.

[0020] Furthermore, the toothbrush set (1) may be configured so that when the toothbrushes are butted together with their tips facing each other, the curved convex portions (6aC, 7bC) of each tooth are received in and interlock with the curved concave portions (6aR, 7bR) of the other tooth. This allows for differences in brushing function based on the inverse structure of the concave and convex portions, reducing missed spots and imperfect brushing due to user habits, and further improving tooth brushing accuracy. [Effects of the Invention]

[0021] This device allows for quick and gentle brushing to clean the gaps between teeth and gums more effectively. It also reduces the problem of missed spots due to user habits, contributing to improved brushing accuracy. [Brief explanation of the drawings]

[0022] [Figure 1]1 is a plan view of a toothbrush set (first and second toothbrushes) according to an embodiment of the present invention; [Figure 2] 2 is an enlarged view of a main part showing that when the brush parts of the toothbrush set shown in FIG. 1 are butted together with their tips facing each other, the surfaces where the bristles are joined together coincide. [Figure 3] These are diagrams showing the first toothbrush, where (a) is a front view, (b) is a side view, (c) is a side view showing only the central bristle bundle, (d) is a view from the tip of the handle, and (e) is a view from the base of the handle. [Figure 4] FIG. 2 is an enlarged front view of a main part showing the arrangement of the central bristle bundles and the side bristle bundles in the brush head of the first toothbrush. [Figure 5] These are diagrams showing the second toothbrush, where (a) is a front view, (b) is a side view, (c) is a side view showing only the central bristle bundle, (d) is a view from the tip of the handle, and (e) is a view from the base of the handle. [Figure 6] FIG. 10 is an enlarged front view of the main part showing the arrangement of the central bristle bundles and the side bristle bundles in the brush head of the second toothbrush. [Figure 7] These are diagrams of teeth viewed from above, showing the state of cleaning the interdental spaces and tooth surfaces, (a) is a diagram of the first toothbrush, and (b) is a diagram of the second toothbrush. [Figure 8] FIG. 10 is a side view of the teeth and gums showing a state in which the first toothbrush is being used to clean the gap between the gums and the surfaces of the teeth. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] FIG. 1 is an overall view of a toothbrush set 1 according to one embodiment of the present invention. The toothbrush set 1 comprises a first toothbrush 2A and a second toothbrush 2B, which are used individually to correct any missed spots due to the user's brushing habits. The first toothbrush 2A and the second toothbrush 2B are housed in a case (not shown), for example, and the two are used as a set. The case makes them easy to carry to work, travel, etc.

[0025] The first toothbrush 2A has a toothbrush body 5 having a long handle 3 and a bristle section 4 formed at the tip of the handle 3, and a brush section 8A consisting of multiple central bristle bundles 6a and multiple side bristle bundles 7a. The central bristle bundles 6a are shown in black for ease of understanding. The second toothbrush 2B, like the first toothbrush 2A, has a toothbrush body 5 having a long handle 3 and a bristle section 4 formed at the tip of the handle 3, and a brush section 8B consisting of multiple central bristle bundles 6b and multiple side bristle bundles 7b. The tips of the brush section 8A of the first toothbrush 2A and the brush section 8B of the second toothbrush 2B have a shape in which a curved convex portion and a curved concave portion are connected in the longitudinal direction of the handle 3.

[0026] As shown in Fig. 1, when the brush head 8A of the first toothbrush 2A and the brush head 8B of the second toothbrush 2B are butted together with their tips facing each other, the surface of the bristles of the brush head 8A of the first toothbrush 2A and the surface of the bristles of the brush head 8B of the second toothbrush 2B are configured to coincide, as shown in Fig. 2. In other words, the bristles of the brush head 8A of the first toothbrush 2A and the bristles of the brush head 8B of the second toothbrush 2B are in a point-symmetric relationship, overlapping when either one is rotated 180 degrees. The configuration of the first toothbrush 2A and the second toothbrush 2B will be described in detail below.

[0027] As mentioned above, the only difference between the first toothbrush 2A and the second toothbrush 2B is the shape of the bristles of the brush heads 8A and 8B. Therefore, the following description will focus on the first toothbrush 2A. In Figure 3, (a) is a front view, (b) is a left side view, (c) is a left side view of the brush head 8A showing only the central bristle bundle 6a, (d) is a view from the tip of the handle, and (e) is a view from the base of the handle. The handle 3 of the first toothbrush 2A has a gripping portion 3A that the user grips and a neck portion 3B that is narrower than the gripping portion 3A and therefore more flexible. A recess 3C is formed between the gripping portion 3A and the neck portion 3B for placing the tip of a finger, such as the thumb, to secure the toothbrush in place. Reference symbol 3D denotes a through-hole for hanging from a hook or threading a string through.

[0028] With this configuration, the user cleans teeth T (see Figures 7 and 8) by grasping gripping portion 3A and moving brush portion 8A at the tip of handle 3. Handle 3 of first toothbrush 2A is made of a relatively hard synthetic resin material such as polypropylene, and the bristles that make up central bristle bundle 6a and side bristle bundles 7a of brush portion 8A are made of a relatively soft synthetic resin material such as nylon.

[0029] As shown in Figure 3(a), the brush head 8A preferably has a longitudinal width W1 of approximately 20 mm and a lateral width W2 of approximately 7 mm to allow it to easily fit into the oral cavity and be maneuverable. The thickness t of the bristle section 4 is approximately 4 mm. As shown in Figure 5, the second toothbrush 2B has a similar configuration except for the brush head 8B.

[0030] As shown in Figure 3(a), the bristle bundles that make up the brush part 8A are classified into two types: central bristle bundles 6a, indicated by black circles, and side bristle bundles 7a, indicated by white circles, depending on where they are placed in the bristle implantation part 4. That is, the brush part 8A is composed of multiple central bristle bundles 6a arranged along the longitudinal direction P in the center of the bristle implantation part 4, and multiple side bristle bundles 7a arranged adjacent to and surrounding the central bristle bundles 6a. The black and white designation is simply for ease of distinction and does not indicate a difference in material.

[0031] Next, the configuration of the central hair bundle 6a and the side hair bundles 7a will be described in detail. As shown in FIG. 4, the central hair bundle 6a is composed of multiple hair bundles and is arranged in a row at equal intervals in the longitudinal direction P at the center of the lateral direction Q of the bristle implantation section 4. In this embodiment, an example is shown in which six central hair bundles 6a are arranged. The side hair bundles 7a include a first portion 7a1 arranged closer to the handle 3 than the multiple central hair bundles 6a, a second portion 7a2 arranged on both sides of the multiple central hair bundles 6a in a direction perpendicular to the longitudinal direction P (lateral direction Q) at equal intervals from the central hair bundle 6a, and a third portion 7a3 arranged closer to the tip than the multiple central hair bundles 6a. In this embodiment, the first portion 7a1 has three bundles, the second portion 7a2 has a total of 12 bundles on both sides, and the third portion 7a3 has two bundles. The second portions 7a2 are spaced at the same intervals as the central bristle bundles 6a and have the same amount of bristles, so as shown in Figure 3(b), they appear to overlap the central bristle bundles 6a when viewed from the side. Furthermore, while the number of bristle bundles on each side of the handle 3 is three, the number of bristle bundles in the third portion 7a3 at the tip end is two, which allows the width of the tip end of the brush head 8A to be narrowed. This makes it easier to clean the back teeth.

[0032] As shown in FIG. 3(b), the side bristle bundles 7a each have a smoothly curved convex portion 7aC at the longitudinal tip of the brush portion 8A and a smoothly curved concave portion 7aR at the rear end that connects to the curved convex portion 7aC. As shown in FIG. 3(c), the center bristle bundles 6a each have a smoothly curved convex portion 6aC at the longitudinal tip of the brush portion 8A and a smoothly curved concave portion 6aR at the rear end that connects to the curved convex portion 6aC. The curved convex portion 6aC of the center bristle bundles 6a has a longer tip than the convex portion 7aC of the side bristle bundles 7a. Therefore, as shown in black in FIG. 3(b), the tip of the curved convex portion 6aC of the center bristle bundle 6a protrudes from the ridge of the curved convex portion 7aC of the side bristle bundles 7a. On the other hand, the curved concave portion 6aR of the center bristle bundle 6a has a shorter tip than the curved concave portion 7aR of the side bristle bundles 7a. Therefore, as shown by the broken line in FIG. 3(b), the ridge line of the curved recess 6aR of the central hair bundle 6a is hidden inside the curved recess 7aR of the side hair bundle 7a.

[0033] Next, the brush part 8B of the second toothbrush 2B will be described in detail with reference to Figure 5. In Figure 5, (a) is a front view, (b) is a left side view, (c) is a left side view of the brush part 8B showing only the central bristle tuft 6b, (d) is a view from the tip of the handle, and (e) is a view from the base of the handle. The arrangement of the bristle tufts is the same as in brush part 8A, so the reference numerals for the central bristle tufts and the side bristle tufts have been changed to 6b and 7b, respectively, in Figure 6, and their explanations will be omitted.

[0034] As shown in Figure 5(b), the side bristle bundles 7b each have a smoothly curved recessed portion 7bR at the longitudinal tip of the brush portion 8B and a smoothly curved convex portion 7bC at the rear end that connects to the curved recessed portion 7bR. The central bristle bundles 6b each have a smoothly curved recessed portion 6bR at the longitudinal tip of the brush portion 8B and a smoothly curved convex portion 6bC at the rear end that connects to the curved recessed portion 6bR. The curved convex portion 6bC of the central bristle bundle 6b has a longer tip than the curved convex portion 7bC of the side bristle bundles 7b. Therefore, as shown in black, the tip of the curved convex portion 6bC of the central bristle bundle 6b protrudes from the ridge of the curved convex portion 7bC of the side bristle bundles 7b. On the other hand, the curved concave portion 6bR of the central bristle bundle 6b has a shorter tip than the curved concave portion 7bR of the side bristle bundles 7b. Therefore, the ridges of the curved recesses 6bR of the central bristle bundle 6b are hidden inside the curved recesses 7bR of the side bristle bundles 7b. In other words, the tip shape (concave-convex order) of the brush head 8B is opposite to that of the brush head 8A of the first toothbrush 2A.

[0035] Next, with reference to FIGS. 7 and 8, the advantages of selectively using the first toothbrush 2A and the second toothbrush 2B for tooth brushing will be described.

[0036] 7A and 7B are diagrams showing the first toothbrush 2A and the second toothbrush 2B in use, showing the state in which they are cleaning the interdental gaps TG between teeth T, and are views of multiple teeth T from above. FIG. 7A shows the first toothbrush 2A in use, in which the brush head 8A is placed against the surfaces TS and interdental gaps TG of teeth T and moved in small increments to clean the surfaces TS and interdental gaps TG of teeth T.

[0037] At this time, the apexes of the curved convex portions 6aC of the central bristle bundle 6a and the curved convex portions 7aC of the side bristle bundles 7a can easily penetrate not only the surfaces TS of the teeth T but also the depressions TU and interdental gaps TG of the teeth T, enabling the removal of dirt from deep positions. In this case, the central bristle bundle 6a, which has a narrower width in the short direction Q, hits the surfaces of the teeth T before the side bristle bundles 7a, and the convex shape of the central bristle bundle 6a allows it to penetrate deeper positions. At this time, the contact of the central bristle bundle 6a is not impeded by the side bristle bundles 7a, which are shorter than the central bristle bundle 6a, allowing the central bristle bundle 6a to penetrate locally deeper. In practice, the central bristle bundle 6a cleans deep positions such as the interdental gaps TG, while the surrounding areas (such as the surfaces TS of the teeth T) are cleaned by the side bristle bundles 7a, which hit the surfaces of the teeth T later than the central bristle bundle 6a. In other words, the central bristle bundle 6a and the side bristle bundles 7a perform separate cleaning functions in the depth direction. Therefore, the ability to remove dirt from deep areas can be prevented from decreasing compared to when cleaning the surface TS of the teeth T.

[0038] Meanwhile, the curved recesses 6aR of the central bristle bundle 6a and the curved recesses 7aR of the side bristle bundles 7a, which are continuous with the curved protrusions 6aC and 7aC, function as a whole to contain dirt removed by the curved protrusions 6aC and 7aC, and also fit to surround and clean the surface TS of the tooth T. In this case, the curved recesses 7aR hit the surface TS of the tooth T first, and then the curved recesses 6aR hit later. Cleaning efficiency is improved because the unsettled curved recesses 6aR hit the area of ​​the surface TS of the tooth T surrounded by the curved recesses 7aR. In other words, the relationship between the curved recesses 6aR and 7aR is gradual, just like the relationship between the curved protrusions 6aC and 7aC, and cleaning efficiency is improved.

[0039] Figure 7(b) shows the second toothbrush 2B in use. As mentioned above, the curved convex and concave portions of the brush head 8A of the first toothbrush 2A are reversed, resulting in a different brushing function. Therefore, any missed spots or imperfect brushing caused by the user's brushing habits with the first toothbrush 2A can be corrected (including the concepts of complementation and correction) by using the second toothbrush 2B, thereby improving tooth brushing accuracy.

[0040] FIG. 8 shows the first toothbrush 2A using the curved convex portions 6aC and 7aC to clean the gum gap MG, which is the gap between the tooth T and the gum M. If the first toothbrush 2A is tilted at approximately 45°, the central bristle bundles 6a can penetrate the gum gap MG, making it easier to scrape away dirt from within the gum gap MG. In this case, too, the side bristle bundles 7a are lower in height than the central bristle bundles 6a at the curved convex portions 6aC and 7aC, so the side bristle bundles 7a do not prevent the tips of the central bristle bundles 6a from penetrating the gum gap MG. The side bristle bundles 7a clean the surface TS of the tooth T around the gum gap MG. The curved concave portions 6aR and 7aR also perform the same function. The same mutual correction function is achieved with the second toothbrush 2B when cleaning the gum gap MG.

[0041] The angle θ (45°) shown in Figure 8 is the optimal angle for brushing the gum gap MG and its surrounding area. To easily obtain this angle, the central bristle bundle 6a is pointed toward the gum gap MG while the side bristle bundles 7a are in contact with the surface TS of the tooth T, resulting in an angle of approximately 45°. If the color of the central bristle bundle 6a is made different from that of the side bristle bundles 7a to make it stand out, it becomes easier to align the central bristle bundle 6a toward the gum gap MG when brushing your teeth while looking in the mirror, making it easier to set the angle at 45°. In this case, only the side bristle bundles 7a may be colored to make the central bristle bundle 6a stand out.

[0042] Furthermore, in the first toothbrush 2A and the second toothbrush 2B configured as described above, the central bristle bundle 6a may be configured to be harder than the side bristle bundles 7a. Furthermore, in the first toothbrush 2A and the second toothbrush 2B, the bristles of the central bristle bundle 6a may be configured to be greater in volume than the side bristle bundles 7a. By increasing the bristles of the central bristle bundle 6a, the rigidity of the central bristle bundle 6a can be improved relative to the side bristle bundles 7a. This allows the central bristle bundle 6a to maintain high cleaning performance when reaching deep into the interdental gaps TG, gum gaps MG, and grooves TU. Conversely, the bristles of the central bristle bundle 6a may be configured to be less than the side bristle bundles 7a. This can reduce irritation when the central bristle bundle 6a comes into contact first, even in cases of gingivitis, and can prevent unexpected pain.

[0043] Although a certain degree of cleaning function can be achieved by using only either the first toothbrush 2A or the second toothbrush 2B, using the first toothbrush 2A and the second toothbrush 2B separately allows for highly accurate correction of areas that are left unbrushed due to the user's brushing habits. The intervals between uses may be consecutive when brushing teeth, for example, using the first toothbrush 2A in the morning and the second toothbrush 2B in the evening. In this case, for example, the handles 3 may be different colors so that they can be visually distinguished, and by deciding which color to use first, the mistake of using the same toothbrush twice can be prevented.

[0044] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the claims of the utility model registration and the technical ideas described in the specification and drawings. [Explanation of symbols]

[0045] 1 toothbrush set 3 patterns 3A grip part 3B neck 3C recess 4. Hair transplantation area 5 Toothbrush body 6a, 6b central hair bundle 6aC, 6bC, 7aC, 7bC Curved convex part 6aR, 6bR, 7aR, 7bR curved recess 7a, 7b Side hair bundles 7a1, 7b1 First part 7a2, 7b2 Second part 7a3, 7b3 Third part 8A, 8B Brush section M gums MG Gum gap T tooth TG interdental gap TS Tooth surface TU Tooth depression

Claims

1. A toothbrush having a long handle, a bristle section formed on the tip side of the handle, and a brush section consisting of a plurality of bristle bundles planted in the bristle section, for cleaning teeth with the brush section, A toothbrush characterized in that the tip of the brush part has a shape in which a curved convex part and a curved concave part are connected in the longitudinal direction of the handle.

2. The brush section has, as the bristle bundles, a plurality of central bristle bundles arranged side by side in the longitudinal direction of the handle, and a plurality of side bristle bundles arranged adjacent to and surrounding the periphery of the plurality of central bristle bundles, The side tufts of bristles each have a smoothly curved convex portion at the tip end of the brush part in the longitudinal direction and a smoothly curved concave portion at the rear end that is continuous with the curved convex portion, The central bristle bundle has a smoothly curved convex portion at the tip end side in the longitudinal direction of the brush part and a smoothly curved concave portion at the rear end side that is continuous with the curved convex portion, 2. The toothbrush according to claim 1, wherein the curved convex portion of the central bristle bundle has a longer tip than the curved convex portion of the side bristle bundles.

3. The brush section has, as the bristle bundles, a plurality of central bristle bundles arranged side by side in the longitudinal direction of the handle, and a plurality of side bristle bundles arranged adjacent to and surrounding the periphery of the plurality of central bristle bundles, The side tufts of bristles each have a smoothly curved convex portion at the tip end of the brush part in the longitudinal direction and a smoothly curved concave portion at the rear end that is continuous with the curved convex portion, The central bristle bundle has a smoothly curved convex portion at the tip end side in the longitudinal direction of the brush part and a smoothly curved concave portion at the rear end side that is continuous with the curved convex portion, 2. The toothbrush according to claim 1, wherein the curved recess of the central bristle bundle has shorter bristles than the curved recess of the side bristle bundles.

4. 4. The toothbrush according to claim 2, wherein the central bristle bundles and the side bristle bundles have different colors.

5. The brush section has, as the bristle bundles, a plurality of central bristle bundles arranged side by side in the longitudinal direction of the handle, and a plurality of side bristle bundles arranged adjacent to and surrounding the periphery of the plurality of central bristle bundles, The side tufts of bristles each have a smoothly curved recess at the tip end of the brush part in the longitudinal direction and a smoothly curved protrusion at the rear end that is continuous with the curved recess, The central bristle bundle has a smoothly curved recess at the tip end side in the longitudinal direction of the brush part and a smoothly curved protrusion at the rear end side that is continuous with the curved recess, 2. The toothbrush according to claim 1, wherein the curved convex portion of the central bristle bundle has a longer tip than the curved convex portion of the side bristle bundles.

6. The brush section has, as the bristle bundles, a plurality of central bristle bundles arranged side by side in the longitudinal direction of the handle, and a plurality of side bristle bundles arranged adjacent to and surrounding the periphery of the plurality of central bristle bundles, The side tufts of bristles each have a smoothly curved recess at the tip end of the brush part in the longitudinal direction and a smoothly curved protrusion at the rear end that is continuous with the curved recess, The central bristle bundle has a smoothly curved recess at the tip end side in the longitudinal direction of the brush part and a smoothly curved protrusion at the rear end side that is continuous with the curved recess, 2. The toothbrush according to claim 1, wherein the curved recess of the central bristle bundle has shorter bristles than the curved recess of the side bristle bundles.

7. 7. The toothbrush according to claim 5, wherein the central bristle bundles and the side bristle bundles have different colors.

8. A toothbrush set characterized in that, when the toothbrush described in any one of claims 2 to 4 is used as a first toothbrush and the toothbrush described in any one of claims 5 to 7 is used as a second toothbrush, when the brush part of the first toothbrush and the brush part of the second toothbrush are butted together with their tip ends facing each other, the surface on which the bristles of the brush part of the first toothbrush are connected coincides with the surface on which the bristles of the brush part of the second toothbrush are connected.

9. The toothbrush set according to claim 8, wherein when the toothbrushes are butted together with the tip ends facing each other, the tips of the side bristles and the tips of the central bristles coincide with each other.

10. The toothbrush set according to claim 9, wherein when the toothbrushes are butted together with their tip ends facing each other, the convex portions of each tooth are received in the concave portions of the other tooth and fit together.

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