Back tooth end face toothbrush

Abstract

The utility model provides a back tooth end face toothbrush, which belongs to the technical field of daily necessities, and comprises a grab handle, a toothbrush head, a toothbrush handle and a toothbrush head, the grab handle comprises a holding rod and a mounting rod, the holding rod and the mounting rod are mutually connected into a whole, and the included angle between the holding rod and the mounting rod is an obtuse angle; the L-shaped brush rod is provided with a connecting end and a brush head end, the connecting end of the L-shaped brush rod is connected with the end of the mounting rod, and bristles are arranged on one end face of the brush head end of the brush rod. The tooth cleaning device is simple in structure, good in cleaning effect and capable of effectively cleaning the end face of the rear tooth.

Description

Technical Field

[0001] The utility model relates to the technical field of daily necessities, in particular to a toothbrush for the end surfaces of posterior teeth. Background Art

[0002] As people's living standards improve, their health awareness is also gradually improving, and their requirements for dental health are also increasing, and they are paying more and more attention to the protection of teeth. Although there are more and more tools and means for cleaning and protecting teeth, such as manual toothbrushes, electric toothbrushes, interdental brushes (also known as interdental brushes), adaptive interdental brushes, dental floss, water flossers, mouthwashes, etc. for daily use, and they can also go to dental hospitals or clinics regularly for ultrasonic, sandblasting, whitening, polishing and other methods to clean teeth, there is no effective tooth cleaning device for the posterior end surface of the posterior teeth (second molars or third molars-wisdom teeth) to effectively clean the tooth surface. The second molar (or third molar-wisdom tooth) tooth bears an extremely important function of eating and chewing. Because it is located at the innermost part of the oral cavity, it is also the most difficult part to clean. This position is also the most prone to periodontal disease and caries. Once caries and periodontal disease occur here, it will affect eating, sleeping, and mentality at the least, and even cause tooth loss and even systemic diseases, bringing a series of physical and mental health problems.

[0003] In order to solve the problem of cleaning the end faces of posterior teeth, the following two methods are usually used:

[0004] 1. Go to a dental hospital or clinic regularly for professional ultrasonic cleaning, but it is time-consuming and expensive. Therefore, it cannot be used as a daily cleaning method;

[0005] 2. Currently, the only tools that can be used to clean the end surfaces of posterior teeth are large-diameter interdental brushes. However, since interdental brushes are not designed specifically for cleaning the end surfaces of teeth, their brush heads have low strength, are easily deformed, are small in size, and the shape of the bristles does not fit the tooth surface well, resulting in low cleaning efficiency. The ergonomics of the brush handles are poor, the handles are short, and actual operation is inconvenient. Utility Model Content

[0006] The purpose of the embodiment of the utility model is to provide a toothbrush for the end faces of posterior teeth, so as to solve the above-mentioned problems that in order to clean the end faces of posterior teeth, it is necessary to go to a dental hospital or clinic for professional ultrasonic teeth cleaning regularly, but it is time-consuming and expensive; and the interdental brush is used for cleaning, but the interdental brush has low strength, is easy to deform, has a small brush head size, the shape of the bristles does not fit the tooth surface well, the cleaning efficiency is low, the ergonomics of the brush handle is poor, the handle is short, and the actual operation is inconvenient.

[0007] In order to achieve the above-mentioned object, the embodiment of the utility model provides a posterior tooth end surface toothbrush, and the posterior tooth end surface toothbrush comprises:

[0008] A handle, the handle comprising a grip rod and a mounting rod, the grip rod and the mounting rod are connected to each other as a whole, and the angle between the grip rod and the mounting rod is an obtuse angle;

[0009] The L-shaped brush rod comprises a connecting end and a brush head end. The connecting end of the L-shaped brush rod is connected to the end of the mounting rod. Bristles are arranged on one end surface of the brush head end of the brush rod.

[0010] Optionally, a plurality of first position limiting protrusion groups are arranged at intervals on the surface of the mounting rod;

[0011] The connecting end of the L-shaped brush rod is provided with a concave hole, and a plurality of second limiting protrusions are arranged at intervals in the concave hole;

[0012] The end of the mounting rod is inserted into the recessed hole of the L-shaped brush rod, and the first limiting protrusion group and the corresponding second limiting protrusion are engaged with each other to realize the fastening connection between the mounting rod and the brush rod, and the engaging relationship between the first limiting protrusion group and the second limiting protrusion is changed, thereby adjusting the telescopic amount of the L-shaped brush rod relative to the end of the mounting rod and changing the length of the toothbrush on the posterior tooth end surface.

[0013] Optionally, the connecting end of the L-shaped brush rod is a first connecting rod, the brush head end of the L-shaped brush rod is a second connecting rod, the second connecting rod is connected to the first connecting rod via a bending connection portion to form the L-shaped brush rod, and the bending connection portion can be subjected to force to produce elastic deformation to change the bending angle of the L-shaped brush rod.

[0014] Optionally, the bent connection portion includes:

[0015] An L-shaped metal sheet, two ends of which are respectively connected to the first connecting rod and the second connecting rod;

[0016] The plastic layer is arranged to cover the L-shaped metal sheet.

[0017] Optionally, the handle serves as a hand-holding portion, and its width gradually decreases toward the end of the mounting rod, so that the width of the L-shaped brush rod connected to the mounting rod is smaller than the hand-holding portion.

[0018] Optionally, the hand-held portion has an anti-skid friction section, and the surface of the anti-skid friction section is provided with anti-skid protrusions arranged in a uniform manner.

[0019] Optionally, an extension line of the handle is directed toward the bristles.

[0020] Optionally, the length, width and height of the bristle area are 10-18 mm, 3-7 mm and 3-7 mm respectively.

[0021] Optionally, the length of the bristles located in the middle is greater than the length of the bristles located at the edge.

[0022] Optionally, the angle between the grip rod and the mounting rod is 135-155 degrees.

[0023] The technical solution has a simple structure, low use cost, and high cleaning efficiency, and can effectively clean the end faces of the posterior teeth and effectively protect the teeth.

[0024] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0026] Figure 1 It is a front view of the posterior tooth end surface toothbrush provided by the utility model;

[0027] Figure 2 It is a top view of the posterior tooth end surface toothbrush provided by the utility model;

[0028] Figure 3 This is a schematic diagram of the connection structure between the first mounting rod and the L-shaped brush rod provided by the utility model;

[0029] Figure 4 This is a schematic diagram of the connection structure between the second mounting rod and the L-shaped brush rod provided by the utility model;

[0030] Figure 5 It is a schematic diagram of the connection structure of the bending connection part provided by the utility model;

[0031] Figure 6 It is a schematic diagram of using the posterior tooth end surface toothbrush provided by the utility model.

[0032] Description of Reference Numerals

[0033] 1-handle; 2-L-shaped brush rod; 3-bristles;

[0034] 4-bending connection part; 11-grip rod; 12-installation rod;

[0035] 21-concave hole; 22-first connecting rod; 23-second connecting rod;

[0036] 41-L-shaped metal sheet; 42-plastic layer; 111-anti-slip friction section;

[0037] 121 - first limiting protrusion group; 211 - second limiting protrusion. DETAILED DESCRIPTION

[0038] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0039] In the embodiments of the present utility model, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use.

[0040] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0041] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0042] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Figure 1 It is a front view of the posterior tooth end surface toothbrush provided by the utility model; Figure 2 It is a top view of the posterior tooth end surface toothbrush provided by the utility model; Figure 3This is a schematic diagram of the connection structure between the first mounting rod and the L-shaped brush rod provided by the utility model; Figure 4 This is a schematic diagram of the connection structure between the second mounting rod and the L-shaped brush rod provided by the utility model; Figure 5 It is a schematic diagram of the connection structure of the bending connection part provided by the utility model; Figure 6 It is a schematic diagram of using the posterior tooth end surface toothbrush provided by the utility model.

[0046] like Figure 1-2 As shown, this embodiment provides a posterior tooth end surface toothbrush, and the posterior tooth end surface toothbrush comprises:

[0047] A handle 1, wherein the handle 1 comprises a grip rod 11 and a mounting rod 12, wherein the grip rod 11 and the mounting rod 12 are connected to each other as a whole, and an angle between the grip rod 11 and the mounting rod 12 is an obtuse angle;

[0048] The L-shaped brush rod 2 has a connecting end and a brush head end. The connecting end of the L-shaped brush rod 2 is connected to the end of the mounting rod 12 . Bristles 3 are arranged on one end surface of the brush head end of the brush rod 2 .

[0049] Specifically, in the present embodiment, in order to achieve effective cleaning of the end faces of the posterior teeth, a toothbrush for the end faces of the posterior teeth is provided, and in order to improve the fitting effect and the convenience of use, in combination with the oral structure, the position of the teeth, and the fact that the brush handle is not completely parallel to the oral cavity when the hand-held end face brush enters the oral cavity to brush the teeth, its overall structure is provided to include: a handle 1 and an L-shaped brush rod 2, wherein the handle 1 includes a handle 11 and a mounting rod 12, and the mounting rod 12 is obliquely arranged at the end of the handle 11, and the two have a certain inclination angle, forming an obtuse angle, and the bristles 3 are arranged on the brush head end of the L-shaped brush rod 2, and are connected to the mounting rod 12 through the connecting end of the L-shaped brush rod 2. The toothbrush for the end faces of the posterior teeth formed by the above structure can improve the convenience of use and effectively clean the end faces of the posterior teeth. During use, if Figure 6 As shown, after squeezing toothpaste onto the bristles 3, hold the handle 11 with your hand and put the end of the bristles 3 into the oral cavity, so that the bristles 3 fit the end surface of the back teeth and move back and forth to clean the end surface of the back teeth.

[0050] Among them, all edges of the L-shaped brush rod 2 are rounded to improve the comfort of the brush head in the mouth and in the hand. The grip rod 11 and the mounting rod 12 can be an integrally formed structure to enhance the strength of the mechanism. In addition, the first end of the mounting rod 12 connected to the grip rod 11 has the same width and thickness as the grip rod 11, and the end connected to the L-shaped brush rod 2 is the second end. The width and thickness of the mounting rod 12 decrease from the first end to the second end.

[0051] Furthermore, if Figure 3-4 As shown, a plurality of first position-limiting protrusion groups 121 are arranged at intervals on the surface of the mounting rod 12;

[0052] A concave hole 21 is provided at one end of the L-shaped brush rod 2 connected to the mounting rod 12, and a plurality of second limiting protrusions 211 are arranged at intervals in the concave hole 21;

[0053] The end of the mounting rod 12 is inserted into the recessed hole 21 of the L-shaped brush rod 2, and the first limiting protrusion group 121 and the corresponding second limiting protrusion 211 are engaged with each other to realize the fastening connection between the mounting rod 12 and the brush rod 2, and the engaging relationship between the first limiting protrusion group 121 and the second limiting protrusion 211 is changed, thereby adjusting the extension and contraction amount of the L-shaped brush rod 2 relative to the end of the mounting rod 12, and changing the length of the posterior tooth end surface toothbrush.

[0054] Specifically, in the present embodiment, since there are certain differences in the size of the oral cavity and the depth of the teeth in the oral cavity between children and adults, if the posterior tooth end surface toothbrush is set as a structure with a fixed length, the convenience of use of either party will be reduced, thereby reducing the cleaning effect. Therefore, the L-shaped brush rod 2 is detachably set on the mounting rod 12. In order to achieve position adjustment and ensure that the L-shaped brush rod 2 can be fixed on the mounting rod 12, a plurality of first limiting protrusion groups 121 are arranged at intervals on the mounting rod 12; a concave hole 21 is arranged at one end of the L-shaped brush rod 2 connected to the mounting rod 12, and a plurality of first limiting protrusion groups 121 are arranged at intervals in the concave hole 21. A plurality of second limiting protrusions 211 are arranged at intervals. After the end of the mounting rod 12 is inserted into the concave hole 21 of the L-shaped brush rod 2, the corresponding first limiting protrusion group 121 and the corresponding second limiting protrusion 211 are engaged with each other, so that the L-shaped brush rod 2 and the mounting rod 12 are engaged and fixed. In addition, when the length adjustment is required, the L-shaped brush rod 2 is pulled outward to adjust the extension amount of the L-shaped brush rod 2 relative to the end of the mounting rod 12 (changing the position of the end of the mounting rod 12 in the concave hole 21). At this time, the corresponding first limiting protrusion group 121 and the new corresponding second limiting protrusion 211 are engaged with each other, thereby changing the length of the posterior tooth end surface toothbrush. Among them, the first limiting protrusion group 121 includes two limiting protrusions arranged at intervals, and the corresponding second limiting protrusion 211 is engaged between the two limiting protrusions of the first limiting protrusion group 121.

[0055] More specifically, in order to avoid rotational displacement and shaking between the mounting rod 12 and the L-shaped brush rod 2 during use, the mounting rod 12 and the L-shaped brush rod 2 are set to a structure other than a circular structure, that is, their cross-sections are set to a rectangular, elliptical, etc. structure. Each first limiting protrusion group 121 and the second limiting protrusion 211 can adopt intermittent convex strips to ensure contact stability.

[0056] Furthermore, if Figure 5As shown, the connecting end of the L-shaped brush rod 2 is a first connecting rod 22, the brush head end of the L-shaped brush rod 2 is a second connecting rod 23, the second connecting rod 23 is connected to the first connecting rod 22 through a bending connecting part 4 to form the L-shaped brush rod 2, and the bending connecting part 4 can produce elastic deformation under force to change the bending angle of the L-shaped brush rod 2.

[0057] Specifically, in the present embodiment, when the posterior tooth end surface is cleaned with a toothbrush for the posterior tooth end surface, since the L-shaped brush rod 2 will be subjected to a certain extrusion force, the turning point of the L-shaped brush rod 2 is the weakest part of the whole, and there is a risk of breakage during use, which may cause damage to the oral cavity. Therefore, a bending connection part 4 is embedded at the turning point to increase its bending strength, ensure that the L-shaped brush rod 2 can produce elastic deformation, and effectively avoid breakage during use.

[0058] More specifically, in order to reduce stress concentration, the L-shaped brush rod 2 adopts an arc transition, that is, a round chamfer structure.

[0059] Furthermore, if Figure 5 As shown, the bent connection portion 4 includes:

[0060] An L-shaped metal sheet 41, two ends of which are respectively connected to the first connecting rod 22 and the second connecting rod 23;

[0061] The plastic layer 42 is disposed to cover the L-shaped metal sheet 41 .

[0062] Specifically, in this embodiment, the bending connection part 4 is configured to include an L-shaped metal sheet 41. The structural strength of the L-shaped metal sheet 41 is greater than that of the plastic structure, and it has a certain elastic deformation and is not easy to bend. In addition, the outer layer of the L-shaped metal sheet 41 is covered with a plastic layer 42 to protect the L-shaped metal sheet 41 and increase its service life. The L-shaped metal sheet can also be replaced by an arc-shaped metal sheet.

[0063] Furthermore, the handle 1 serves as a hand-held portion, and its width gradually decreases toward the end of the mounting rod 12, so that the width of the L-shaped brush rod 2 connected to the mounting rod 12 is smaller than the hand-held portion.

[0064] Specifically, due to the special position of the end surface of the back teeth, the part of the toothbrush entering the oral cavity may affect the normal sawing brushing. Therefore, in this embodiment, the overall shape and structure of the L-shaped brush rod 2 and the bristles 3 are slightly smaller than those of a conventional toothbrush. At the same time, in order to facilitate the grip during use, the width of the L-shaped brush rod 2 is smaller than the width of the handle 1. Preferably, its length is about two-thirds of that of a conventional toothbrush, and its width is about half of that of a conventional toothbrush, so that the tooth surface can be basically covered when the brush head is sawing brushing.

[0065] Furthermore, if Figure 2 As shown, the hand-held portion has an anti-skid friction section 111, and the surface of the anti-skid friction section 111 is provided with anti-skid protrusions arranged in a uniform manner.

[0066] Specifically, in this embodiment, an anti-skid friction section 111 is provided on the grip 11, so that the grip is more stable during use. The anti-skid friction section 111 is usually provided at the position where the thumb is located when the grip is tight.

[0067] Furthermore, the bristles 3 are soft plastic bristles.

[0068] Specifically, in this embodiment, the bristles 3 are made of soft plastic bristles, which can ensure the cleaning effect and protect the gums.

[0069] Furthermore, an extension line of the handle 11 faces the bristles 3 .

[0070] Specifically, the overall structure is defined by limiting the extension line of the handle 11 toward the bristles 3 .

[0071] Furthermore, the length, width and height of the bristle 3 area are 10-18 mm, 3-7 mm and 3-7 mm respectively.

[0072] Specifically, the height of the second or third molar above the gum surface is about 2 to 4 mm for the lower teeth and about 3 to 6 mm for the upper teeth, and the width of the end face is about 7 to 10 mm. For this reason, the bristle surface size of the toothbrush head is preferably determined to be 15×5 mm, with a length dimension of about two-thirds of that of a traditional toothbrush and a width dimension of about half of that of a traditional toothbrush, which can basically ensure that the tooth surface is covered when the brush head is sawing. The bristle height is compressed to less than half of the bristle height of a traditional toothbrush, preferably determined to be 5 mm, and the thickness of the bristle mounting panel is preferably determined to be 2 mm, the sum of the two is 7 mm. Due to the limited space at the rear of the end face of the posterior teeth, if the size is too large, it may affect the normal sawing brushing.

[0073] Furthermore, the length of the bristles 3 located in the middle is greater than the length of the bristles 3 located at the edge.

[0074] Specifically, in this embodiment, the overall shape of the bristles 3 is high in the middle and low on both sides. This is because when the tooth end brush is held in the hand and enters the oral cavity to brush teeth, the brush handle is not completely parallel to the oral cavity, but has a certain angle. The purpose is to eliminate the influence of this angle and ensure that the brush surface and the tooth surface are effectively fitted when brushing teeth. The bristles are soft bristles used in traditional toothbrushes, and the bristle tip size is controlled at 0.01-0.02mm. The bristles are arranged in two or three groups along the longitudinal direction of the brush head.

[0075] Furthermore, the included angle between the mounting rod 12 and the grip rod 11 is 135-155 degrees.

[0076] Specifically, since the handle 1 is not completely parallel to the oral cavity when the hand-held dental face brush is put into the oral cavity to brush teeth, there is a certain angle. In order to eliminate the influence of this angle, the mounting rod 12 is tilted on the grip rod 11, and the angle between the mounting rod 12 and the grip rod 11 is 135-155 degrees, ensuring effective fit between the brush surface and the tooth surface when brushing teeth.

[0077] Example

[0078] In one embodiment, according to the use scenarios and requirements of the end-face toothbrush for the posterior teeth, the requirements of easy gripping, flexible use, and good cleaning effect need to be met. The total length of the handle 1 is controlled within 100mm, the width is 9mm, the thickness is 6mm, and the width transitions to 5mm and the thickness is 3mm within 30mm near the front end of the brush head. The handle is bent and extended 30mm at a distance of 30mm from the brush head. The angle between the mounting rod 12 and the grip rod 11 is 150 degrees. The purpose is to prevent the handle from colliding with the corners of the mouth when the end-face brush is used according to the characteristics of the oral structure. An anti-slip friction surface is set at the end of the handle 1 (where the thumb is grasped after holding it) to ensure a firmer grip during use. The overall surface size of the bristles is determined to be 15×5mm, the height of the bristles is compressed to less than half the height of the bristles of a traditional toothbrush, initially set at 5mm, and the thickness of the bristle mounting panel is tentatively set at 2mm, and the sum of the two is 7mm.

[0079] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0080] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0081] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A toothbrush for the end surface of posterior teeth, characterized in that: The posterior tooth end surface toothbrush comprises: A handle (1), the handle (1) comprising a grip rod (11) and a mounting rod (12), the grip rod (11) and the mounting rod (12) being connected to each other as a whole, and an angle between the grip rod (11) and the mounting rod (12) being an obtuse angle; An L-shaped brush rod (2) having a connecting end and a brush head end, wherein the connecting end of the L-shaped brush rod (2) is connected to the end of the mounting rod (12), and bristles (3) are arranged on one end surface of the brush head end of the brush rod (2); A plurality of first position-limiting protrusion groups (121) are arranged at intervals on the surface of the mounting rod (12); The connecting end of the L-shaped brush rod (2) is provided with a concave hole (21), and a plurality of second limiting protrusions (211) are arranged at intervals in the concave hole (21); The end of the mounting rod (12) is inserted into the concave hole (21) of the L-shaped brush rod (2), and the first limiting protrusion group (121) and the corresponding second limiting protrusion (211) are mutually engaged to realize the fastening connection between the mounting rod (12) and the brush rod (2), and the engagement relationship between the first limiting protrusion group (121) and the second limiting protrusion (211) is changed, thereby adjusting the extension and contraction amount of the L-shaped brush rod (2) relative to the end of the mounting rod (12), thereby changing the length of the posterior tooth end surface toothbrush.

2. The posterior tooth end surface toothbrush according to claim 1, characterized in that: The connecting end of the L-shaped brush rod (2) is a first connecting rod (22), the brush head end of the L-shaped brush rod (2) is a second connecting rod (23), the second connecting rod (23) is connected to the first connecting rod (22) via a bending connecting portion (4) to form the L-shaped brush rod (2), and the bending connecting portion (4) can be subjected to force to generate elastic deformation to change the bending angle of the L-shaped brush rod (2).

3. The posterior tooth end surface toothbrush according to claim 2, characterized in that: The bent connecting portion (4) comprises: An L-shaped metal sheet (41), wherein two ends of the L-shaped metal sheet (41) are respectively connected to the first connecting rod (22) and the second connecting rod (23); The plastic layer (42) is arranged to cover the L-shaped metal sheet (41).

4. The posterior tooth end surface toothbrush according to claim 1, characterized in that: The handle (1) serves as a hand-held portion, and its width gradually decreases toward the end of the mounting rod (12), so that the width of the L-shaped brush rod (2) connected to the mounting rod (12) is smaller than the hand-held portion.

5. The posterior tooth end surface toothbrush according to claim 4, characterized in that: The hand-held part has an anti-skid friction section (111), and the surface of the anti-skid friction section (111) is provided with anti-skid protrusions arranged in a uniform manner.

6. The posterior tooth end surface toothbrush according to claim 1, characterized in that: An extension line of the gripping rod (11) faces the bristles (3).

7. The posterior tooth end surface toothbrush according to claim 1, characterized in that: The length, width and height of the bristle (3) area are respectively: 10-18 mm, 3-7 mm, and 3-7 mm.

8. The posterior tooth end surface toothbrush according to claim 1, characterized in that: The length of the bristles (3) located in the middle is greater than the length of the bristles (3) located at the edge.

9. The posterior tooth end surface toothbrush according to claim 1, characterized in that: The angle between the grip rod (11) and the mounting rod (12) is 135-155 degrees.

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