Gum massage brush

Abstract

To provide a gum massage brush which is capable of gentle massage and of facilitating blood circulation of the gum comfortably and effectively.SOLUTION: On a bristle implanting face 12a of a head part 12, a plurality of bristle implanting holes 15 of 2 to 5 mm hole diameters are dispersedly arranged and formed at seven places, and in the bristle implanting holes 15, bristle bundles 16 are each implanted by flat line bristle implantation using flat lines 18. Bristles 17 constituting the bristle bundles 16 are provided with tapered shape parts formed by tapered processing by agent and are implanted so that a length h becomes 6 to 12 mm. Also, in the respective implanted bristle bundles 16, the bristles are implanted in different lengths h within a range where difference s in height between the shortest bristles 17 and the longest bristles 17 is within 1.5 to 5.0 mm.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a gum massaging brush, and more particularly to a gum massaging brush that stimulates the attached gum area to promote blood circulation in the gums. [Background technology]

[0002] Massaging the gums can promote blood circulation in the gums, stimulate the oral cavity, and promote saliva secretion, so various gum massage brushes have been developed for massaging the gums (see, for example, Patent Documents 1, 2, and 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3219859 [Patent Document 2] JP 2015-211750 A [Patent Document 3] JP 2017-6475 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, since arterioles run through the attached gingiva, which is the base of the gums, it is thought that massaging the attached gingiva area (see Figure 4) can further increase blood flow and more effectively promote blood circulation in the gums. However, a specialized gum brush designed to massage the attached gingiva area has not yet been developed.

[0005] In addition, because the part of the gum where the gums are attached has a protrusion due to the alveolar bone, it is desirable to develop a gum massage brush that takes into account the presence of such a protrusion due to the alveolar bone, and that can transmit force firmly to the part of the attached gum while massaging gently, thereby making it possible to comfortably and effectively promote blood circulation in the gums.

[0006] To provide a gum massaging brush capable of massaging the attached gum part with gentle touch while firmly transmitting force to the attached gum part, and thereby promoting blood circulation in the gums in a comfortable and effective manner. [Means for solving the problem]

[0007] The present invention is a gum massaging brush, which comprises a brush body having a head portion, a grip portion, and a neck portion connecting the head portion and the grip portion, and a plurality of bristle implantation holes having a hole diameter of 2 to 5 mm are formed and distributed on the bristle implantation surface of the head portion, and bristle bundles each consisting of a bundle of a plurality of bristles are implanted in each of these bristle implantation holes by flat wire implantation using a flat wire, and the bristles constituting the bristle bundles have a tapered portion formed by tapering with a chemical at the tip side portion so that the arithmetic mean roughness Ra of the surface is 1 μm or less, preferably in a region 300 μm from the tip of the bristles, and are implanted to have a bristle length of 6 to 12 mm, and in each implanted bristle bundle, the plurality of bristles are implanted with different bristle lengths so that the height difference between the bristles with the shortest bristle length and the bristles with the longest bristle length is in the range of 1.5 to 5.0 mm. Effect of the Invention

[0008] According to the gum massaging brush of the present invention, it is possible to transmit force firmly to the attached gum part while massaging it gently, and to promote blood circulation in the gums comfortably and effectively. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view of a gum massaging brush according to a preferred embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of a gum massaging brush according to a preferred embodiment of the present invention. [Diagram 3] FIG. 3(a) is an enlarged schematic plan view of the bristles of the gum massage brush, FIG. 3(b) is an enlarged schematic vertical sectional view, and FIG. 3(c) is an enlarged schematic horizontal sectional view. [Figure 4] FIG. 4 is an explanatory diagram of the attached gingiva portion. [Diagram 5] FIG. 5 is an explanatory diagram of a situation in which the gums are massaged using a gum massaging brush. [Figure 6] 6(a) to (d) are explanatory diagrams of gum massaging brushes of Examples 1 to 4. [Figure 7] 7(a) and (b) are explanatory diagrams of gum massaging brushes of Comparative Examples 1 and 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] As shown in Fig. 1 and Fig. 2, the gum massaging brush 10 according to a preferred embodiment of the present invention is formed by implanting tufts 16 each consisting of a bundle of bristles 17 into a plurality of implantation holes 15 formed in the head part 12 of the brush body 11 having a head part 12, a grip part 13, and a neck part 14 connecting them, using a flat wire 18 (see Fig. 3(a) and (c)). The gum massaging brush 10 of this embodiment has tufts 16 implanted into each implantation hole 15 having a large hole diameter, and the bristles 17 constituting each tuft 16 are implanted with a predetermined bristle length h and a predetermined height difference s, thereby enabling the gums to be effectively massaged (see Fig. 5) at the part of the gums that is attached to the gums, and has the function of effectively improving blood circulation in the gums.

[0011] The gum massaging brush 10 of this embodiment is a gum massaging brush that stimulates the attached gums to promote blood circulation in the gums, and includes a brush body 11 having a head 12, a grip 13, and a neck 14 that connects the head 12 and the grip 13. A plurality of bristle implantation holes 15 having a hole diameter of 2 to 5 mm are formed and distributed on the bristle implantation surface 12a of the head 12, and bristle bundles 16 each consisting of a bundle of bristles 17 are implanted in each of the bristle implantation holes 15 by flat wire implantation using a flat wire 18. The bristles 17 that make up the bristle bundles 16 have a tapered portion formed by tapering with a chemical agent at the tip end, and are implanted to have a bristle length h of 6 to 12 mm (see Figs. 3(b) and (c)). In each implanted bristle bundle 16, the bristles 17 are implanted with different bristle length h such that the height difference s between the bristles 17 with the shortest bristle length and the bristles 17 with the longest bristle length is in the range of 1.5 to 5.0 mm. The tapered portion of the bristles 17 formed by tapering with a chemical has an arithmetic mean roughness Ra of the surface of the bristles 17 in a region 300 μm from the tip thereof being 1 μm or less.

[0012] In addition, in this embodiment, as preferably shown in Figure 3 (c), in each bristle bundle 16, the multiple bristles 17 are planted so that the bristles 17 have a bristles height h that gradually decrease from the bristles 17 with the highest bristles height h in the portion close to the upper portion of the driven flat line 18 to the outer bristles 17 that are away from the upper portion of the flat line 18, due to the bristles 16 being planted in a flat line.

[0013] In this embodiment, the brush body 11 can be formed by using, without any particular limitation, synthetic resins that are generally used as brush bodies of toothbrushes. The brush body 11 can be formed by integrally molding the brush body 11 consisting of the head portion 12, the grip portion 13, and the neck portion 14, using, for example, polybutylene terephthalate resin, polypropylene resin, plant-derived polyethylene resin, etc. The head portion 12 is formed to have a thickness t (see FIG. 3(b)) of preferably 3.0 to 6.0 mm (for example, 5 mm in this embodiment). The thickness t of the head portion is preferably 3.0 mm or more, more preferably 4.0 mm or more, and preferably 6.0 mm or less, and more preferably 5.0 mm or less, from the viewpoint of improving the bristle strength and the ease of insertion into the oral cavity. The grip portion 13 is formed in a shape that is easy for the user to grip when operating the brush 10, and the neck portion 14 is formed as a part that connects the head portion 12 and the grip portion 13, as described above.

[0014] In this embodiment, the head portion 12 is formed so that the axial length L of the brush body 11 from the base end connected to the neck portion 14 to the tip (see FIG. 3(a)) is preferably 13 to 19 mm, and the maximum width B of the brush body 11 in a direction perpendicular to the axial direction (see FIG. 3(a)) is preferably 13 to 19 mm. By forming the head portion 12 to such a size, it is possible to improve the reachability to the attached gums when massaging the gums. The "base end connected to the neck portion 14" referred to here refers to the outer edge of the bristle implantation hole 15 provided on the neck portion 14 side, which is the rearmost end side, among the multiple bristle implantation holes 15 provided in the head portion 12.

[0015] Furthermore, in this embodiment, the bristle implantation surface 12a of the head portion 12 has a plurality of bristle implantation holes 15 formed in a dispersed arrangement with a hole diameter in the range of 2 to 5 mm (for example, 4 mm in this embodiment), which is larger than the hole diameter of the bristle implantation hole formed in the bristle implantation base of a general toothbrush. From the viewpoint of ensuring the bristle strength and the feeling of use at the same time, the hole diameter of the bristle implantation hole 15 is preferably 2 mm or more, more preferably 2.5 mm or more, preferably 5 mm or less, and more preferably less than 4.5 mm. The bristle implantation holes 15 are preferably formed in 3 to 19 places (for example, 7 places in this embodiment), preferably arranged in a staggered pattern, and are opened. By forming the plurality of bristle implantation holes 15 in a dispersed arrangement in a staggered pattern, it is possible to arrange the bristle implantation holes 15 with a large hole diameter more densely, and the thick-diameter bristle bundles 16 planted in these bristle implantation holes 15 can also be arranged more densely, so that the force can be firmly transmitted to the gums without the tips of the bristles 17 being lost.

[0016] Furthermore, in this embodiment, the multiple bristle implantation holes 15 can be formed to a depth d (see FIG. 3(b)) of preferably 2.5 to 5.5 mm from the bristle implantation surface 12a of the head portion 12 (for example, a depth of 4.0 mm in this embodiment). From the viewpoint of ensuring bristle implantation strength, the depth d is preferably 2.5 mm or more, and more preferably 3.0 mm or more. From the viewpoint of improving insertability into the oral cavity, the depth d is preferably 5.5 mm or less, and more preferably 5.0 mm or less. The depth d of the bristle implantation holes 15 from the bristle implantation surface 12a of the head portion 12 can be appropriately set depending on the number of bristles 17 constituting the bristle bundle 16, the height of the flat line 18 to be driven, etc.

[0017] In this embodiment, bristle bundles 16 each consisting of a bundle of bristles 17 are planted in each of the bristle planting holes 15 by flat wire planting using a flat wire 18. The bristles 17 constituting the bristle bundles 16 are made of artificial bristles such as saturated polyester resin or nylon, and preferably have a relatively soft bristle diameter of, for example, about 6 mil (0.152 mm). The aforementioned saturated polyester or nylon is preferable as the artificial bristles, and the bristle diameter is preferably 4 mil (0.101 mm) or more and 8 mil (0.203 mm) or less. The bristles 17 are preferably used in a bundle of 50 to 450 bristles (for example, 260 bristles in this embodiment) so as to form bristles 16 having a bundle diameter to be planted in bristles holes 15 having a large hole diameter, and when the flat wires 18 are driven in and the bristles 16 are planted in each bristles hole 15, the bristles are folded in half at the center where the driven flat wires 18 are arranged, and the bristles are planted with a bristles height h of 6 to 12 mm from the bristles planting surface 12a. In this embodiment, from the viewpoint of improving the insertability of the brush against the attached gum of the molar teeth and from the viewpoint of providing a good feeling of use to the attached gum, the sum (h+t) of the bristles 17 bristles height h and the thickness t of the head portion is preferably 9 to 17 mm, more preferably 11 to 16 mm, and even more preferably 13 to 15 mm.

[0018] In addition, in this embodiment, when the multiple bristles 17 that make up the bristle bundle 16 are implanted flat, the outer bristles 17 that are folded back at a position farther from the flat line 18 in each implantation hole 15 have a larger radius of curvature than the inner bristles 17 (see Figures 6(a) to (d)).Therefore, the outer bristles 17 have a longer portion embedded inside the implantation hole 15, and the bristles 17 have a bristle length h, which is the height of the portion protruding from the implantation surface 12a, that is shorter than the bristles h of the inner bristles 17, which have a smaller radius of curvature.

[0019] 3(c), in each bristle bundle 16, the bristles 17 are implanted so that the bristles h gradually decrease from the bristles 17a with the highest bristles h in the area close to the upper part of the driven flat line 18 toward the bristles 17b with the lowest bristles h on the outside, away from the upper part of the flat line 18. As a result, the bristles 17 constituting the bristle bundle 16 are implanted to have a bristles h of 6 to 12 mm, and in each implanted bristle bundle 16, the bristles are implanted with different bristles h within a range in which the height difference s between the bristles 17a with the highest bristles and the bristles 17b with the lowest bristles h is 1.5 to 5.0 mm depending on the bundle diameter of the bristles 16. In addition, from the viewpoint of ensuring that the tips of the bristles 17 reach gaps such as the neck of the teeth, the height difference s between the bristles 17a with the highest bristles and the bristles 17b with the lowest bristles is preferably 1.5 mm or more, more preferably 2.0 mm or more, and is preferably 5.0 mm or less, and more preferably 4.5 mm or less.

[0020] In each bristle bundle 16, the multiple bristles 17 are planted in a roof shape so that the bristles have a gradually decreasing bristles height h, from bristles 17a with the highest bristles height h located close to the top of the driven flat line 18 toward the outer bristles 17b away from the top of the flat line. This enables the tips of the bristles 17 to firmly reach gaps such as the neck of the teeth, allowing for a more effective massage of the gums.

[0021] In this embodiment, the bristles 17 constituting the bristle bundle 16 are tapered bristles having a tapered portion with a cross-sectional area gradually decreasing toward the tip at a portion of, for example, about 6 to 10 mm from the tip side, and preferably have a plurality of branched core hairs in the tapered portion. The tapered portion of the bristles 17 is obtained by immersing the tip of the bristles to a predetermined depth in a known dissolving solvent, for example, and sharpening the tip with a chemical. The branched core hairs preferably provided in the tapered portion can be obtained by, for example, a method described in JP-A-9-322821, in which a bundle of islands-in-the-sea composite fibers is immersed in a heated caustic soda solution with both cut end faces exposed, and the sea component made of polyethylene terephthalate at both ends is selectively dissolved and removed to expose an island-shaped core made of nylon 610.

[0022] The tapered bristles of the present invention have an arithmetic mean roughness Ra of the surface in a region 300 μm from the tip of the bristles 17 of 1 μm or less (for example, 0.1 μm in this embodiment). From the viewpoint of obtaining a gentle feel on the gums, the arithmetic mean roughness Ra of the surface in a region 300 μm from the tip of the bristles 17 is preferably 1 μm or less, more preferably 0.8 μm or less, and even more preferably 0.5 μm or less. Here, the arithmetic mean roughness Ra of the surface of the tapered portion of the bristles 17 is an average roughness measured and calculated according to, for example, JIS standard B0601 (revised version in 2013). Moreover, the region 300 μm from the tip of the tapered portion is preferably an area large enough to obtain a measurement image in one image using a commercially available microscope.

[0023] The bristles 17 constituting the bristle bundle 16 are tapered bristles with a tapered tip formed by tapering with a chemical, which allows a gentler feel on the gums when massaging the gums. Preferably, the tapered tip has multiple branched core bristles, which allows a gentler feel on the gums and maintains the rigidity of the roots of the bristles 17, allowing for a more reliable transfer of force to the gums.

[0024] In this embodiment, in each of the seven bristle implantation holes 15 formed in the bristle implantation surface 12a of the head portion 12, a bristle bundle 16 consisting of a bundle of bristles 17 is implanted by flat wire implantation using a flat wire 18. The flat wire 18 is a known material in the shape of a thin strip, and is made of metal such as brass, stainless steel, or aluminum, or plastic such as hard plastic or biodegradable plastic. The flat wire 18 has a thickness of preferably about 0.14 to 0.26 mm (for example, 0.2 mm in this embodiment) and a strip shape with a height in the driving direction of preferably about 0.8 to 1.8 mm (for example, 1.2 mm in this embodiment). The length of the flat wire 18 is longer than the diameter of the tufting hole 15, for example 4 mm, so that the flat wire 18 is driven into the resin forming the head portion 12 at the periphery of the tufting hole 15 so that both ends are pressed into the resin, and the rear edge (upper edge) in the driving direction is positioned inside (lower) than the opening surface of the tufting hole 15 (see FIG. 3(c)). This makes it possible to efficiently plant each bristle bundle 16 into each tufting hole 15 while maintaining the desired tufting strength, with the bristles 17 standing upright from the tufting surface 12a of the head portion 12.

[0025] In this embodiment, it is preferable that the flat lines 18 are driven in with the same orientation, for example, at an angle in the range of 0±5° or 90±5° (for example, an angle in the range of 0±5° in this embodiment) with respect to the axial direction of the brush body 11 in all seven bristle implantation holes 15. This creates regularity in the uneven shape of the brush surface caused by the tips of the implanted multiple bristle bundles 16 when the gum massaging brush 10 is viewed from the front direction facing the axial direction of the brush body 11 or from the side direction perpendicular to the axial direction, thereby improving the design of the gum massaging brush 10.

[0026] In this embodiment, as shown in Fig. 3(a), the brush width b, which is the maximum width in the lateral direction perpendicular to the axial direction of the brush body 11, of the brush section 19 formed by the planted multiple bristle bundles 16, is preferably 13 to 19 mm. This makes it possible to effectively massage the gums even when the brush section 19 is centered on the cervical part of the gums, while reaching the attached gums (see Fig. 5). Here, the brush width b is the maximum width in the lateral direction perpendicular to the axial direction of the brush body 11 at the standing base end of the multiple bristle bundles 16 from the bristle planting surface 12a.

[0027] In this embodiment, the brush length l, which is the maximum axial length of the brush body 19 in the brush section 19 formed by the multiple planted bristle bundles 16, is preferably set to the brush width b±10% of the brush width b. This makes it possible to stabilize the position at which the brush section 19 reaches the gums even if the angle at which the brush section 19 is applied varies depending on the part of the gums. Here, the brush length l is the maximum axial length of the brush body 19 at the erect base end of the multiple bristle bundles 16 from the bristle planting surface 12a.

[0028] 1, it is preferable that the head portion 12 has a concave portion 20 formed in a region between at least one pair of adjacent bristle implantation holes 15 (three in this embodiment) located on the outer periphery of the multiple dispersed bristle implantation holes 15, the peripheral portion of which is recessed toward the center of the head portion 12. This makes it possible to reduce the amount of resin used to form the brush body 11 by reducing the unimplanted space in the head portion 12 where no bristle bundles 16 are implanted.

[0029] Furthermore, in this embodiment, it is preferable that the head portion 12 has a thickness t that is 1.0 to 2.0 times the hole diameter of the tufting hole 15. This ensures a sufficient tufting depth and makes it possible to prevent an extreme decrease in tufting strength.

[0030] Furthermore, the gum massaging brush 10 of this embodiment having the above-mentioned configuration can transmit force firmly to the attached gum area while providing a gentle massage, making it possible to promote blood circulation in the gums in a pleasant and effective manner.

[0031] That is, according to the gum massage brush 10 of this embodiment, a plurality of bristle implantation holes 15 having a hole diameter of 2 to 5 mm are formed in a dispersed arrangement in, for example, seven places on the bristle implantation surface 12a of the head portion 12, and bristle bundles 16 are implanted in each of these bristle implantation holes 15 by flat wire implantation using a flat wire 18. The bristles 17 constituting the bristle bundles 16 have a tapered portion formed by tapering processing with a chemical agent, and are implanted to have a bristle length h of 6 to 12 mm, and in each implanted bristle bundle 16, the bristles are implanted with different bristle lengths h within a range in which the height difference s between the bristles 17 with the shortest bristle length and the bristles 17 with the longest bristle length is 1.5 to 5.0 mm.

[0032] As a result, according to the gum massage brush 10 of this embodiment, the bristles 17 have a tapered portion formed with a medicinal agent, which makes it possible to provide a gentle feeling, especially to the area of ​​the gums where the gums are attached; and because the hole diameter of the bristle implantation holes 15 and the bundle diameter of the bristle bundles 16 implanted therein are large, the tips of the bristles 17 that make up the bristle bundles 16 do not escape, making it possible to transmit force firmly; and because there is a large difference in the height of the bristles 17 in each bristle bundle 16, the tips of the bristles vary, making it easier for them to follow the unevenness of the area of ​​the gums where the gums are attached, which effectively promotes blood circulation in the gums in the area of ​​the gums where the arterioles run.

[0033] The present invention is not limited to the above embodiment and may be modified in various ways. For example, the tufting holes do not necessarily have to have a circular cross-sectional shape, and may have various other cross-sectional shapes such as a polygon, a rectangle, a trapezoid, etc. In this case, the hole diameter is the hole diameter when the cross-sectional area is converted into the area of ​​a circle. In addition, the multiple tufting holes do not necessarily have to be formed in a staggered arrangement in the head portion, and it is not necessarily required that the peripheral portion of the head portion has a recessed portion recessed toward the center. EXAMPLES

[0034] The gum massaging brush of the present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited in any way by the descriptions of the following examples and comparative examples.

[0035] [Gum massage brushes of Examples 1 to 4, and gum massage brushes of Comparative Examples 1 and 2] The gum massaging brushes of Examples 1 to 4 were made to have the same configuration as the gum massaging brush of the above embodiment, and the hole diameter of the bristle implantation hole, the processing method of the tapered bristles, the insertion depth of the flat wires, the height difference of the bristle length in the bristle bundle, etc. were as shown in Table 1 and Figures 6(a) to (d). The gum massaging brushes of Comparative Examples 1 and 2 were made to have the hole diameter, the processing method of the tapered bristles, the insertion depth of the flat wires, the height difference of the bristle length in the bristle bundle, etc. as shown in Table 1 and Figures 7(a) and (b). In these gum massaging brushes, the length of the bristles before implantation was 24 mm, the thickness of the hole bottom was 1.0 mm, the thickness of the flat wire was 0.20 mm, and the height of the flat wire was 1.2 mm.

[0036] [Table 1]

[0037] The gum massage brushes of Examples 1 to 4 and the gum massage brushes of Comparative Examples 1 and 2 were evaluated for "feeling gentle on the gums," "feeling of force being transmitted to the gums," "bristle strength," and "overall evaluation." The "feeling gentle on the gums" and "feeling of force being transmitted to the gums" were evaluated using a 5-point evaluation method based on actual use (80% or more agreeing with the brush is marked as O, 50% or more but less than 70% as △, and less than 50% as ×), while the "bristle strength" was evaluated using the measured values ​​of the bristle fastening strength test defined in the JIS standard (S3016) (maximum tensile strength of 12N or more is marked as O, 8N or more but less than 12N as △, and less than 8N as ×). The evaluation results are shown in Table 1.

[0038] According to the evaluation results shown in Table 1, it is clear that the gum massaging brushes of Examples 1 to 4 according to the present invention are superior to the brushes of Comparative Examples 1 to 3 as gum massaging brushes. [Explanation of symbols]

[0039] 10 Gum massage brush 11 Brush body 12 Head section 12a Flocked surface 13 Grip part 14 Neck 15 Hair transplant hole 16 Hair bundle 17 Bristle 17a Highest bristles 17b Shortest bristles 18 Flat Line 19 Brush section 20 Concave part h hair length s Height difference b Brush width l Brush length t Thickness

Claims

1. A gum massaging brush, The brush body has a head portion, a handle portion, and a neck portion connecting the head portion and the handle portion, A plurality of implantation holes having a diameter of 2 to 5 mm are formed and distributed on the implantation surface of the head portion, and bristle bundles each consisting of a bundle of bristles are implanted in each of the implantation holes by flat wire implantation using a flat wire. The bristles constituting the hair bundle have a tapered portion at the tip end portion formed by tapering processing using a chemical, and are implanted so as to have a hair length of 6 to 12 mm; In the gum massaging brush, the bristles in each of the planted bristle bundles are planted with different bristle lengths, with the height difference between the bristles with the shortest bristle length and the bristles with the longest bristle length being within a range of 1.5 to 5.0 mm.

2. A gum massaging brush as described in claim 1, wherein the bristles of each of the bristle bundles are planted in a flat line such that the bristles have gradually shorter bristles from the bristles with the highest bristles in the area closest to the flat line that is driven in, toward the outer bristles that are away from the flat line.

3. 3. The gum massaging brush according to claim 1, wherein the bristles each have a plurality of branched core bristles at the tapered portion.

4. A gum massaging brush as described in any one of claims 1 to 3, wherein in all of the bristle holes, the flat lines are driven in with the same orientation at an angle in the range of 0±5° or 90±5° relative to the axial direction of the brush body.

5. 5. The gum massaging brush according to claim 1, wherein the bristles are arranged in a staggered pattern on the bristles surface of the head portion.

6. A gum massaging brush according to any one of claims 1 to 5, wherein the brush width, which is the maximum width in the horizontal direction perpendicular to the axial direction of the brush body, of the brush portion made up of the multiple bristle bundles planted is 13 to 19 mm.

7. 7. The gum massaging brush according to claim 6, wherein the brush length, which is the maximum length in the axial direction of the brush body in the brush portion made up of the multiple tufts of bristles planted, is the brush width ±10% of the brush width.

8. A gum massaging brush as described in any one of claims 1 to 7, wherein the head portion has a concave portion formed in at least one area between a pair of adjacent bristle implantation holes located on the outer periphery of the dispersed bristle implantation holes, the peripheral portion of which is recessed toward the center of the head portion.

9. The gum massaging brush according to any one of claims 1 to 8, wherein the head portion has a thickness that is 1.0 to 2.0 times the diameter of the bristles holes.

10. A gum massaging brush, The brush body has a head portion, a handle portion, and a neck portion connecting the head portion and the handle portion, A plurality of implantation holes having a diameter of 2 to 5 mm are formed and distributed on the implantation surface of the head portion, and bristle bundles each consisting of a bundle of bristles are implanted in each of the implantation holes by flat wire implantation using a flat wire. The bristles constituting the hair bundle have a tapered portion having an arithmetic mean roughness Ra of 1 μm or less in a region 300 μm from the tip of the bristles, and are planted to have a hair length of 6 to 12 mm. In the gum massaging brush, the bristles in each of the planted bristle bundles are planted with different bristle lengths, with the height difference between the bristles with the shortest bristle length and the bristles with the longest bristle length being within a range of 1.5 to 5.0 mm.

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