JP7117901B2 - toothbrush - Google Patents

Description

TECHNICAL FIELD The present invention relates to a toothbrush, and more particularly to a toothbrush in which bristle tufts formed by bundling a plurality of bristles are implanted in a plurality of tufting holes formed in a tufting base.

A toothbrush has tufts (bristle tufts) made by bundling a plurality of bristles, for example, by driving a flat line into a plurality of tufting holes formed on the bristle-implanting surface of a bristle-implanting base or by fusing them with heat. It is formed by fixing. In addition, the toothbrush efficiently performs appropriate cleaning according to the type of teeth such as front teeth and back teeth, and the parts of teeth such as interdental areas, tooth surface areas, neck areas, and back areas, and removes plaque and the like. In order to effectively remove the bristles and to obtain a good feel during brushing, various measures have been taken in the arrangement of the bristle bundles, the shape of the bristle ends, and the like.

In particular, the back teeth have an occlusal surface that serves as a surface for occlusion, and the occlusal surface is a groove that is likely to collect dirt. It is desired to be able to brush well, and a toothbrush capable of efficiently brushing such an occlusal surface has also been developed (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2001-97191

According to the toothbrush disclosed in Patent Document 1, the tip positions of the tips of the bristle bundles forming the tip-side bristle bundle group located on the front end side in the longitudinal direction of the bristle-transplanting base are shifted to the rear ends located on the rear-end side in the longitudinal direction of the bristle-transplanting base. By lowering the tip position of the tip of the outer tuft row that constitutes the side tuft group, in addition to enhancing the effect of cleaning the interdental part and the neck, the tuft of the tip side tuft group Thus, the back teeth can be efficiently cleaned.

On the other hand, for molars, the interdental part between adjacent molars is formed continuously from the side surface side to the occlusal surface side of the molar tooth. Although consideration has been given to cleaning the interdental areas on the occlusal side, no particular consideration has been given. Development of a toothbrush capable of efficiently brushing the interdental part on the occlusal surface side of the tooth is desired.

TECHNICAL FIELD The present invention relates to a toothbrush capable of efficiently cleaning interdental areas on the occlusal surface side of molars, in addition to cleaning the side surfaces and occlusal surfaces of molars.

The present invention relates to a toothbrush in which bristle bundles formed by bundling a plurality of bristles are respectively implanted in a plurality of tufting holes formed in a bristle-transplanting base, wherein the bristle bundles are arranged in rows along the outer peripheral portion of the bristle-transplanting base. and a plurality of hair bundles implanted in a row across the middle portion of the inner region surrounded by the peripheral hair bundle group in the width direction of the hair-planting base. a transverse hair bundle group of hair bundles, a front end side inner hair bundle group of a plurality of hair bundles implanted in the inner region on the front end side in the longitudinal direction of the hair-implanting base from the transverse hair bundle group, and the transverse hairs a rear end side inner hair bundle group consisting of a plurality of hair bundles implanted in the inner region on the rear end side in the longitudinal direction of the hair transplanting base relative to the bundle group, wherein the tip side inner hair bundle group and the The tufts constituting the rear-end-side inner tuft group are formed by bundling a plurality of tapered bristles having a tapered portion with a cross-sectional area decreasing toward the tip. The hair tufts are implanted so that their tips protrude higher than the tufts constituting the transverse tuft group, and the tufts composing the peripheral tuft group and the traverse tuft group do not have tapered portions. The toothbrush is formed by bundling bristles.

According to the toothbrush of the present invention, in addition to cleaning the side surfaces and occlusal surfaces of the back teeth, it is possible to efficiently clean the interdental areas on the occlusal surface side of the back teeth.

1 is a schematic plan view for explaining the configuration of a main part of a toothbrush according to a preferred embodiment of the present invention; FIG. FIG. 2 is a schematic side view illustrating the configuration of essential parts of a toothbrush according to a preferred embodiment of the present invention; 2 is a schematic cross-sectional view along AA in FIG. 1; FIG. FIG. 2 is a perspective view of a toothbrush according to a preferred embodiment of the present invention, which is used to clean back teeth; Fig. 10 is a schematic side view for explaining the configuration of main parts of a toothbrush according to another embodiment;

A toothbrush 10 according to a preferred embodiment of the present invention, as shown in FIGS. Hair bundles (tufts) 15a, 15b, 15c, 15d formed by bundling a plurality of bristles 16a, 16b, 16c, 16d in a plurality of tufting holes 14a, 14b, 14c, 14d (see FIG. 1) formed in 11. (Refer to FIG. 1(a)). When the toothbrush 10 of the present embodiment is used to brush the back teeth, the bristles 16a, 16b, 16c, and 16d constituting the bristle bundles 15a, 15b, 15c, and 15d are placed between the teeth of the back teeth and the occlusal surfaces of the back teeth. By making it easier to enter from the side, in addition to cleaning the side surface and occlusal surface of the back teeth, it has a function to efficiently clean the interdental area on the occlusal surface side of the back teeth.

In the toothbrush 10 of the present embodiment, bristle bundles 15a, 15b, 15c, and 15d formed by bundling a plurality of bristles 16a, 16b, 16c, and 16d are formed in a plurality of tufting holes 14a, 14b formed in the tufting base 11. , 14c and 14d, respectively, along the outer peripheral portion of the bristle-planting base 11, an outer peripheral tuft group 17a composed of a plurality of bristle tufts 15a implanted in a row, and an outer peripheral tuft group. A crossing hair bundle group 17b made up of a plurality of hair bundles 15b implanted in a row across an intermediate portion of an inner region 18 surrounded by 17a in the width direction Y of the hair-transplanting base 11, and a crossing hair bundle group 17b. A tip-side inner tuft group 17c consisting of a plurality of tufts 15c implanted in an inner region 18 (a tip-side inner region 18a) on the tip side in the longitudinal direction X of the bristle-transplanting base 11, and a bristle-transplanting base from the transverse tuft group 17b. 11 and a rear end side inner tuft group 17d of a plurality of tufts 15d implanted in an inner region 18 (rear end side inner region 18b) on the rear end side in the longitudinal direction X of 11 . Hair bundles 15c and 15d constituting the front end side inner hair bundle group 17c and the rear end side inner hair bundle group 17d are formed of a plurality of tapered bristles 16c and 16d having a tapered portion with a cross-sectional area decreasing toward the tip. The tapered tufts are formed by bundling, and are planted so that the tips protrude higher than the tufts 15a and 15b that constitute the peripheral tuft group 17a and the transverse tuft group 17b. The tufts 15a and 15b that constitute the outer tuft group 17a and the transverse tuft group 17b are spherical bristles formed by bundling spherical bristles that preferably have a spherical portion at the tip as bristles that do not have a tapered portion. bundled.

Further, in the present embodiment, preferably, the tip side bristle implantation base (tip side upper stage bristle implantation base) 19a is traversed in the width direction Y in the middle portion of the longitudinal direction X of the bristle implantation base 11, and the rear end side bristle implantation base (rear end side) is provided. A stepped portion 19 is provided (see FIG. 2) to be positioned higher than the lower tufting base 19b, and the tip side inner tuft group 17c is implanted in the tip side upper tufting base 19a, and the rear end side lower tier. A rear end side inner tuft group 17d is implanted in the tuft base 19b.

In this embodiment, the toothbrush main body 13 can be formed by using a commonly used synthetic resin without particular limitation. For example, polypropylene, polyacetal resin, polystyrene resin, polyethylene terephthalate resin, acrylonitrile butadiene styrene resin, cellulose propionate resin, polyarylate resin, polycarbonate resin, acrylonitrile styrene resin, polyester, polytrimethylene terephthalate, polycyclohexanedimethylene terephthalate. It is preferable to use one or two or more kinds of resins. The bristle-implanting base 11 constituting the tip portion of the toothbrush body 13 preferably has a flat track-circular bristle-implanting surface 11a. A plurality of tufting holes 14a, 14b, 14c, 14d are formed. The stepped portion 19 for disposing the front end side upper tufting base 19a higher than the rear end side lower tufting base 19b is a stepped portion having a height difference of 0.5 mm, for example.

In this embodiment, a circular peripheral tufting hole 14a having a diameter of 1.2 mm, for example, is arranged along the outer circumference of the track-circular tufting surface 11a of the tufting base 11, and is attached to the tip-side upper tufting base 19a. They are arranged and formed at 16 places in total, 8 places and 8 places on the lower bristle-implanting base 19b on the rear end side. That is, the peripheral tufting holes 14a are arranged symmetrically with the center line in the width direction as an axis of symmetry along the side peripheral portions on both sides sandwiching the center line in the width direction of the circular track-shaped flocking surface 11a. 4 points are formed on both sides of the front end side bristle implantation base 19a, and 4 points are formed on each side of the rear end side bristle implantation base 19b.

Further, in the present embodiment, the lower bristle-implanting base 19b on the rear end side, which is adjacent to the stepped portion 19 between the upper bristle-implanting base 19a on the front end side, is continuously provided in the width direction Y of the bristle-implanting base 11, for example, φ1. Circular transverse tufting holes 14b each having a size of 2 mm are formed at five locations across the middle portion in the longitudinal direction X of the inner region 18 surrounded by the peripheral tufting holes 14a in the width direction Y. . The transverse tufting holes 14b at both ends are formed so as to serve also as the peripheral tufting holes 14a.

Further, in the present embodiment, a circular tip-side inner tufting hole 14c having a size of φ1.2 mm is provided on the tip-side upper tufting base 19a so as to be surrounded by the outer peripheral tufting hole 14a and the stepped portion 19. They are arranged vertically and horizontally together with the tufting holes 14a and are formed at eight locations.

Furthermore, in the present embodiment, circular rear inner tufting holes 14d having a diameter of 1.2 mm are formed in the lower rear tufting base 19b so as to be surrounded by the peripheral tufting holes 14a and the transverse tufting holes 14b. are arranged vertically and horizontally together with the peripheral tufting holes 14a and the transverse tufting holes 14b, and are formed at six locations.

In the present embodiment, preferably, the peripheral portion of the tufting hole (peripheral tufting hole 14a) in which the most tip-side hair bundle 15a in the outer peripheral hair bundle group 17a is planted and the hair bundle of the transverse hair bundle group 17b A distance s (see FIG. 1) of 6 to 10 mm is maintained in the longitudinal direction X of the tufting base 11 between the tufting holes to be tufted (transverse tufting holes 14b) and the periphery thereof. As a result, the transverse hair bundle 15b forming the transverse hair bundle group 17b planted in the transverse tufting hole 14b surrounding the tip-side inner hair bundle group 17c and the outer peripheral portion on the tip side of the transverse hair bundle group 17b. Together with the peripheral tufts 15a that form the peripheral tuft group 17a on the tip side of the transverse tufts 15b implanted in the tufting holes 14a, a shape conforming to the shape of the peripheral edge of the occlusal surface of each molar is formed. Therefore, it is possible to brush the back teeth while wrapping the occlusal surface with these tufts 15a and 15b, and these tufts 15a and 15b and the tip side inner tuft group 17c. To allow the occlusal surface of the back teeth to be brushed more efficiently by the bristle bundle 15c, and to smoothly insert the bristles 16b forming the transverse bristle bundle 15b into the interdental part on the occlusal surface side of the back teeth. becomes possible (see FIG. 4).

In this embodiment, these tufting holes 14a, 14b, 14c, 14d are bundled with a number of bristles 16a, 16b, 16c, 16d corresponding to the cross-sectional area of each tufting hole 14a, 14b, 14c, 14d. Hair bundles 15a, 15b, 15c and 15d are inserted and fixed respectively. The bristles 16a, 16b, 16c, 16d forming each of the tufts 15a, 15b, 15c, 15d are preferably made of synthetic resin. As the synthetic resin for forming the bristles 16a, 16b, 16c, and 16d, various known ones used for the bristles can be used without particular limitation, such as nylon (registered trademark), nylon 6-12, and the like. and polyesters such as polybutylene terephthalate, and polyolefins.

As a method for tying the hair bundles 15a, 15b, 15c and 15d into the respective tufting holes 14a, 14b, 14c and 14d, various known tufting methods can be employed. For example, (1) a method of folding a hair bundle in half along a flat line and driving it in, or (2) heating one end of the hair bundle to form a molten mass, and then placing the molten resin in a mold. (3) an inserting step of inserting a tuft into a bristle tuft base having a bristle tufting hole (through hole); A method of obtaining a bristle-implanting base or a toothbrush in which tufts are implanted through a thermal processing step of heating to form a molten mass and a coating step of coating the molten mass can be used.

It is preferable that the filling ratio of the hair bundles 15a, 15b, 15c, 15d into the tufting holes 14a, 14b, 14c, 14d (the total cross-sectional area of the bristles/the cross-sectional area of the tufting holes) is 60 to 90%. , 65 to 90%.

In the present embodiment, the eight peripheral tufting holes 14a formed on the flocking surface 11a of the front flocking base 19a of the flocking base 11 are made of, for example, colorless nylon and have a thick bristle diameter of 0.203 mm. Peripheral tufts 15a formed by bundling 24 bristles 16a are planted so that the bristle length from the flocking surface 11a of the tip-side flocking base 19a is, for example, 9.0 mm.

In the eight peripheral tufting holes 14a formed on the tufting surface 11a of the tufting base 19b on the rear end side of the tufting base 11, there are 24 bristles made of, for example, white nylon and having a bristle diameter of 0.203 mm. A peripheral tuft 15a formed by bundling the tufts 16a is planted, for example, so that the bristle length from the tufting surface 11a of the rear-end-side tufting base 19b is 9.5 mm. As a result, the tips of the bristles 16a of the eight peripheral hair bundles 15a implanted on the rear-end-side hair-planting base 19b and the eight peripheral hair bundles 15a implanted on the front-end-side hair-planting base 19a are at the same height. An outer peripheral hair bundle group 17a is formed, which is arranged at the lower position.

Five transverse tufting holes 14b formed in the vicinity of the tip-side tufting base 19a on the tufting surface 11a of the rear-end-side tufting base 19b of the tufting base 11 include peripheral tufting holes 14a of the rear-end-side tufting base 19b. A transverse hair bundle 15b formed by bundling 24 bristles 16b with a diameter of 0.203 mm similar to the outer peripheral hair bundle 15a implanted in the rear end-side hair-planting base 19b, for example, Each hair is planted so that the hair length from 11a is 9.5 mm. As a result, the tips of the bristles 16b of the transverse bundle group 17b of the transverse bundle 15b are positioned at the same height as the tips of the bristles 16a of the outer bundle group 17a of the outer bundle 15a. The transverse tufts 15b of the transverse tuft group 17b, which are planted at both ends in the width direction Y of the tufting base 11, also serve as the peripheral tufts 15a.

Further, in the present embodiment, as described above, the bristle bundles 15a and 15b constituting the outer peripheral tuft group 17a and the transverse bristle bundle group 17b are formed as bristles 15a and 15b that do not have a tapered portion and have, for example, a spherical tip. It is preferably formed by bundling spherical bristles having portions. The tufts 15a and 15b constituting the peripheral tuft group 17a and the transverse tuft group 17b are formed by bundling the spherical bristles 15a and 15b, so that plaque can be efficiently scraped off especially from the smooth portions of the back teeth. becomes possible.

The bristles 15a and 15b constituting the outer peripheral tuft group 17a and the transverse tuft group 17b are not necessarily formed by bundling spherical bristles as the bristles 15a and 15b having no tapered portion. Various other bristles that do not have a tapered portion, such as rounded tips, may be bundled together.

In the present embodiment, eight tip-side inner tufting holes 14c formed in the tip-side upper tufting base 19a so as to be surrounded by the outer peripheral tufting holes 14a and the stepped portion 19 are filled with, for example, colorless polybutylene terephthalate. The tip-side inner bristle bundle 15c formed by bundling 32 bristles 16c with a diameter of 0.178 mm, for example, has a bristle length of 10.5 mm from the bristle-planting surface 11a of the tip-side upper bristle-planting base 19a. Each is planted so as to be 5 mm.

Further, in the present embodiment, six rear inner tufting holes 14d formed in the rear lower tufting base 19b so as to be surrounded by the outer peripheral tufting holes 14a and the transverse tufting holes 14b include, for example, A rear end side inner tuft 15d formed by bundling 32 bristles 16d made of colorless polybutylene terephthalate and having a bristle diameter of 0.178 mm is formed on, for example, the flocking surface 11a of the rear end side lower tufting base 19b. Each is planted so that the hair length from the root is 11.5 mm.

As a result, the tips of the bristles 16d of the rear inner hair bundle group 17d formed by the rear inner hair bundle 15d are at the same height as the tips of the bristles 16c of the front inner hair bundle group 17c formed by the front inner hair bundle 15c. position. In addition, the tips of the bristles 16d of the rear-side inner hair bundle group 17d formed by the rear-side inner hair bundle 15d and the tips of the bristles 16c of the front-side inner hair bundle group 17c formed by the front-side inner hair bundle 15c 1.5 mm higher than the tips of the bristles 16b of the peripheral hair bundle group 17a and the tips of the bristles 16b of the transverse hair bundle group 17b (FIGS. 2 and 4). 3).

In this embodiment, the hair bundles (tapered hair bundles) 15c and 15d forming the tip side inner hair bundle group 17c and the rear end side inner hair bundle group 17d have tapered portions with a cross-sectional area decreasing toward the tip. It is formed by bundling a plurality of tapered bristles 16c and 16d. The tufts 15c and 15d that constitute the tip side inner tuft group 17c and the rear end side inner tuft group 17d are formed by bundling a plurality of tapered bristles 16c and 16d to form grooves on the occlusal surfaces of the molars. It is possible to efficiently clean the dirt accumulated in the inner tufts 16c and 16d. The tufts 15a and 15b constituting the peripheral tuft group 17a and the transverse tuft group 17b can reach the interproximal part and the cervical part without difficulty.

According to the toothbrush 10 of the present embodiment having the above-described configuration, the outer peripheral bristle bundle group 17a implanted along the outer peripheral portion of the bristle-implanting base 11 and the intermediate portion of the inner region 18 surrounded by the outer peripheral bristle bundle group 17a are formed. A transverse hair bundle group 17b implanted across, a tip side inner hair bundle group 17c on the tip side of the longitudinal direction X of the hair implantation base 11 from the transverse hair bundle group 17b, and a hair implantation base 11 from the transverse hair bundle group 17b. and a rear end side inner hair bundle group 17d on the rear end side in the longitudinal direction X. The bristles are formed by bundling a plurality of tapered bristles 16c and 16d, and are planted so that their tips protrude higher than the bristle bundles 15a and 15b that constitute the peripheral bristle bundle group 17a and the transverse bristle bundle group 17b. The tufts 15a and 15b constituting the peripheral tuft group 17a and the transverse tuft group 17b are preferably formed by bundling spherical bristles having spherical portions at their ends.

As a result, according to the toothbrush 10 of the present embodiment, as shown in FIG. 4, when brushing the occlusal surface of the back teeth, the transverse tuft group surrounds the tip-side inner bristle tuft group 17c. The tufts 15b of 17b and the tufts 15a of the peripheral tuft group 17a on the distal side of the transverse tuft group 17b can wrap the occlusal surfaces of individual molars while brushing, so that the occlusal surfaces of individual molars can be brushed. The transverse tuft group 17b and the outer tuft group 17a are formed by the bristle tufts 15c formed by the tapered bristles 16c, which form the inner bristle tuft group 17c and whose tip portion is easily bent, forming grooves on the occlusal surface on which dirt is likely to accumulate. The bristles 16a and 16b, whose tip portions are hard to bend, cooperate with the bristle bundles 15a and 15b to efficiently brush. In addition, the bristles 16b of the transverse tuft group 17b, which are difficult to bend, are moved along the interdental portion on the occlusal surface side of the back teeth, while the bristles 16b of the tuft group 17b on the occlusal surface side are moved along the teeth on the occlusal surface side. It becomes possible to make it deeply penetrate into the interdental part, and it becomes possible to effectively clean the interdental part on the occlusal surface side of the back teeth.

Therefore, according to the toothbrush 10 of the present embodiment, the bristle bundles 15c and 15d formed by the tapered bristles 16c and 16d forming the tip side inner bristle bundle group 17c and the rear end side inner bristle bundle group 17d, and the transverse bristle bundle group 17b and By cooperating with the bristles 16a and 16b and the bristles 15a and 15b that do not have a tapered portion forming the peripheral tuft group 17a, the side surfaces and the occlusal surfaces of the molars can be efficiently cleaned. The bristles 16b of the tufts 15b of the tuft group 17b enable efficient cleaning of the interdental areas on the occlusal surface side of the back teeth.

Further, according to the present embodiment, the stepped portion 19 is provided in the intermediate portion in the longitudinal direction X of the bristle-transplanting base, and the tip-side inner tuft group 17c is implanted in the tip-side upper bristle-implanting base 19a, Since the rear end side inner tuft group 17d is implanted in the rear end side lower tuft base 19b, it is possible to more efficiently clean dirt accumulated in the grooves of the occlusal surfaces of the back teeth. The transverse tuft group 17b is provided on the rear end side lower tuft base 19b in the vicinity of the stepped portion 19, so that the bristle bundle 15b constituting the transverse tuft group 17b is positioned between the teeth on the occlusal surface of the back teeth. It is possible to reach deeper into the part.

It should be noted that the present invention is not limited to the above embodiments and can be modified in various ways. For example, the transverse tuft group 17b can be provided on the tip side upper tuft base 19a in the vicinity of the stepped portion 19, as shown in FIG. As a result, the rigidity of the transverse tuft group 17b is increased, and dirt on the tooth surface can be scraped off more firmly. In addition, it is not always necessary to provide a stepped portion across the width direction in the middle portion of the bristle-transplanting base in the longitudinal direction. can also be planted on the flocked surface of the

10 Toothbrush 11 Flocking base 11a Track circular flocking surface 12 Neck 13 Toothbrush body 14a Peripheral tufting hole 14b Transverse tufting hole 14c Tip side inner tufting hole 14d Rear end side inner tufting hole 15a Peripheral tuft 15b Transverse tuft 15c Tip side Inner hair bundle 15d Rear end side inner hair bundle 16a Bristle (spherical bristles)
16b bristles (spherical bristles)
16c bristles (tapered bristles)
16d bristles (tapered bristles)
17a Outer peripheral hair bundle group 17b Transverse hair bundle group 17c Tip side inner hair bundle group 17d Rear end side inner hair bundle group 18 Inner area 19 Stepped portion 19a Tip side upper tuft base 19b Rear end side lower tuft base X Longitudinal direction of the tuft base Y Width direction of flocking base

Claims (6)

A toothbrush in which bristle bundles formed by bundling a plurality of bristles are implanted in a plurality of tufting holes formed in a bristle-transplanting base,
and a peripheral hair bundle group made up of a plurality of hair bundles formed by bundling bristles not having a tapered portion, which are implanted in a row along the peripheral portion of the hair-implanting base, and surrounded by the peripheral hair bundle group. a crossing tuft group of a plurality of bristle tufts formed by bundling bristles without a tapered portion, which are implanted in a row across the middle portion of the inner region in the width direction of the bristle-implanting base; a bundle of a plurality of tapered bristles having a tapered portion with a cross-sectional area decreasing toward the tip, which is implanted in the inner region on the tip side in the longitudinal direction of the tuft base with respect to the transverse tuft group; and an inner tuft group on the tip side of a plurality of tufts that are attached to each other, and a cross-sectional area that decreases toward the tip, which is implanted in the inner region on the rear end side in the longitudinal direction of the bristle-implanting base relative to the transverse tuft group. and a rear end side inner hair bundle group formed by a plurality of hair bundles formed by bundling a plurality of tapered bristles having tapered portions ,
The hair tufts forming the tip side inner tuft group and the rear end side inner tuft group are planted so that the tip protrudes higher than the tufts forming the outer peripheral tuft group and the transverse tuft group. Toothbrush provided . 2. The toothbrush according to claim 1, wherein the bristles not having a tapered portion forming the tufts constituting the peripheral tuft group and the transverse tuft group are spherical bristles having a spherical portion at the tip. The bristle tufting base is provided between the peripheral edge portion of the tufting hole in which the hair bundle on the most tip side in the outer peripheral hair bundle group is implanted and the peripheral edge portion of the tufting hole in which the hair bundle of the transverse hair bundle group is implanted. 3. The toothbrush according to claim 1 or 2, wherein a space of 6 to 10 mm is maintained in the longitudinal direction. A stepped portion is provided in the middle portion in the longitudinal direction of the bristle-transplanting base so as to traverse the widthwise direction so that the front-side bristle-transplanting base is arranged higher than the rear-end-side bristle-transplanting base, and the distal-side bristle-transplanting base is provided inside the distal-side bristle-transplanting base. 4. The toothbrush according to any one of claims 1 to 3, wherein a group of tufts of bristles is implanted, and the inner tuft group of bristles on the rear end side is implanted on the tuft base on the rear end side. 5. The toothbrush according to claim 4, wherein said transverse tuft group is planted on said rear end tuft base. 5. The toothbrush according to claim 4, wherein said transverse tuft group is planted on said tip side tuft base.

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