JP4198740B1 - toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush capable of brushing a side surface portion of a tooth facing between teeth.
A plurality of hair bundles are discretely spaced apart from each other in at least the front region 11a of the brush head 11, and form a row along the longitudinal direction of the brush head. 1 row or 2 rows spaced in the width direction, and the longitudinal spacing W of the hair bundles A1, A2 or B1, B2 in the row is approximately the average adjacent teeth of the portion other than the mandibular anterior teeth It is characterized by being equal to the interval of the intermediate part.
[Selection] Figure 1

Description

  The present invention relates to manual and electric toothbrushes.

Maintaining healthy teeth is important for health and beauty. In particular, it is desirable to encourage daily tooth brushing to remove food residue and plaque between teeth. For this reason, toothbrushing with a toothbrush is important, and many types of toothbrushes such as an interdental brush are commercially available. However, the interdental brush has poor durability, and is easily bent after being used several times, and finally easily breaks. In addition, since the bristles are provided outward around the wire, in an extreme case, the teeth may be scraped off to form a circular hole by the interdental brush. For this reason, the proposal of the toothbrush for facilitating the brushing of an interdental part irrespective of the interdental brush has been made. For example, a structure has been proposed in which toothbrush bristles are arranged in rows at intervals of tooth widths so that brushing between the teeth can be easily performed (Patent Documents 1 and 2). In addition, a structure that facilitates the brushing of the interdental part by arranging the cross-sectional shape of the hair bundle in a triangle and arranging the hair bundles at intervals of the tooth width is proposed (Patent Document 3). By using these toothbrushes, interdental brushing can be easily performed to some extent.
JP 2002-0778529 A JP 2004-237031 A JP 2007-151704 A

  The above toothbrush can, however, brush the interdental part from the front side or the back side, but faces the teeth by inserting the hair of the toothbrush between the teeth and reciprocating in the buccal tongue direction. The tooth part cannot be brushed, and there is no interest in such reciprocation. However, reciprocating brushing in the buccal tongue direction of the tooth portion facing between the teeth where the gap is generated is very important for maintaining healthy teeth. An object of this invention is to provide the toothbrush which can brush the side part of the tooth which faces between the teeth with a gap | interval.

In the toothbrush of the present invention, the brush head is divided into a front side region and a rear side region, and in the front side region, a plurality of hair bundles are discretely spaced from each other, and the length of the brush head is a row along the direction, the column is Ri Do two columns at intervals in the width direction, intervals of the width direction is the spacing 3mm~6mm interdental portions of the mandibular front teeth, hair in the column The interval in the longitudinal direction of the bundle is substantially equal to the interval between the average adjacent interdental portions of the portion other than the lower anterior teeth of 5 mm to 11 mm . The front side region is occupied by two rows of four hair bundles at the position of the foremost side and the immediately rear side thereof, and the rear side region includes hair bundles arranged densely and substantially equally. It is characterized by that.

With the above configuration, in the case of a manual toothbrush, the bristles are inserted into the slight gap between the root teeth on both sides of one tooth using the bristles in the front region of the toothbrush, and penetrated to the cheek tongue Can reciprocate in the direction. In the case of an electric toothbrush, it is possible to brush between teeth with little force by inserting the bristles between the root teeth and applying electricity. It is very beneficial for those who are or. At this time, the interval between the hair bundles in the row is approximately equal to the average interval between adjacent teeth of the upper jaw, and the two rows of hair bundles are separated from each other. In the meantime, there is no hair bundle that hits the teeth and gets in the way. Therefore, two hair bundles in the front region of one row are inserted between the root teeth on both sides of one tooth, the above movement is performed freely, and the tooth facing the teeth is brushed by dental plaque. And food waste can be removed. In addition, the distance between the two rows in the width direction is 3 mm to 6 mm between the lower jaw and the front teeth, so that the lower front teeth are exceptionally small compared to the other teeth. By using these two hair bundles, the interdental facing portion can be easily brushed. In this case, the manual and electric toothbrushes are tilted forward a little while inserting the two furthest hair bundles between the teeth while aligning the longitudinal direction of the brush head in the tooth axis direction. . In this case as well, brushing can be performed for each interdental portion using one hair bundle. As a result, it is possible to brush between two adjacent teeth at the same time, so the user feels profitable and is actually efficient. Further, using only one hair bundle on the front side, the hair bundle may be inserted only into one interdental portion, and brushing may be performed by reciprocating along the cheek tongue direction. In this case, when there are two rows, when the hair bundle at the tip of one row is worn out, the hair bundle at the tip of the second row can be used instead of the worn hair bundle. Since there is an interval in the width direction between the two rows, the hair bundles at the tip do not interfere with each other. In addition, since the back side region of the brush head includes hair bundles that are densely, substantially and evenly arranged, it is possible to efficiently brush the crown or occlusal portion using the back side hairs. Can do. The specific content of the above-mentioned “interval in the longitudinal direction of the hair bundle in the row is substantially the interval between the adjacent interdental portions other than the lower anterior teeth” will be described later with reference to the drawings. To do.

It should be noted that human teeth have teeth of approximately the same size in the upper jaw, and for the lower jaw, the front teeth are small, but the other teeth are almost the same as the upper teeth. It is that we focused on a certain point. For this reason, with the exception of the lower teeth of the lower jaw, it is possible to obtain a single tooth due to the high elasticity and flexibility provided by the hair bundle, if the distance between the other teeth is the same as that of the average interdental space. The hair bundle can be freely inserted between the root teeth on both sides of the hair. Therefore, any portion of the teeth other than the anterior teeth of the lower jaw can be easily brushed between the interdental facing portions by the above toothbrush. Since the tooth width size and thus the distance between adjacent teeth changes depending on the tooth growth age classification of infants, children, adults, etc., it may be an age-specific toothbrush according to the above-mentioned tooth age classification. In addition, it is sufficient if there are two hair bundles constituting the row. In addition, as described above, using only one hair bundle on the front side, inserting the hair bundle only in one interdental region, reciprocating along the cheek tongue direction, and brushing Also good. The condition of teeth varies from person to person, and people with poor tooth alignment may have two teeth overlapping each other. Many users brush every time.

In two rows tufts of the upper Kisaki side region than the first hair bundle earliest side of the brush head, the second hair bundle immediately rear side, positioned on the end side in the width direction of the brush head Can be arranged. In other words, with respect to the two hair bundles on the front side, an arrangement in which the interval between the two rows becomes narrower on the front side can be taken. Accordingly, when the tip of the toothbrush is applied from the back side (lingual side) of the tooth to the back surface of the tooth, the toothbrush is obliquely inserted into the oral cavity. For this reason, when brushing the back side of the back teeth of the lower jaw, the grip handle part is tilted upward and the tip of the brush head is tilted downward, and in the above arrangement, the furthest hair bundle and the hair bundle immediately thereafter are: It becomes almost horizontal along the dentition direction. Similarly, when brushing between teeth from the back side of the upper teeth or brushing the gums, the above-mentioned hair bundles are arranged so as to be substantially horizontal.

  The hair bundle in the rear region of the brush head may be softer than the hair bundle in the front region. As a result, when used in an electric brush, the gum mucosa can be brushed and blood circulation in the capillaries of the gum mucosa can be improved. As a result, a great effect can be obtained in the treatment of alveolar pyorrhea.

  According to the toothbrush of the present invention, the tooth portion facing the teeth by inserting the bunch of manual and electric toothbrushes between teeth, reciprocating in the buccal tongue direction with a manual toothbrush, and vibrating with an electric toothbrush Can be easily brushed.

(Embodiment 1)
FIG. 1 is a diagram showing a manual toothbrush 10 according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of a portion of the brush head 11. In the toothbrush 10, two rows of hair bundles are arranged in the front region 11 a of the brush head 11, and in each row, the hair bundles A 1 and B 1 on the frontmost side of the row and the next hair bundles A 2 and B 2 are arranged. Is substantially equal to the interval between the average interproximal portions other than the lower anterior teeth. The interval W between the hair bundles is the distance between the centers of the hair bundles. In the case of adults, the center interval W of the hair bundle is preferably 5 mm to 11 mm, and is more common, and the preferable center interval W is 5 mm to 8 mm. The center interval W of the hair bundle is “the distance in the longitudinal direction of the hair bundle in the row” and corresponds to “substantially, the interval between the average adjacent interdental portions of the portion other than the lower anterior teeth”. The average diameter of the hair bundle should be 2 mm or less at the root, 1.5 mm or less in consideration of penetration between teeth, and 1.2 mm or less in the case of a narrow human between teeth. It is good. However, in the toothbrush of the present invention, since the bristle bundle is formed of resin, the bristle bundle is rich in flexibility and easily bent. Therefore, a small amount of incompatibility of the bristle bundle can be easily eliminated by bending the bristle bundle or the like. . In this respect, it is greatly different from the interdental brush in which the resin bristles are arranged radially around the wire, which is a great advantage of the toothbrush of the present invention. The length of the hair bundle should just extend 7 mm or more from the surface of the brush head 11. In the rear region 11b of the brush head, the hair bundles C are arranged densely and evenly. In addition, although the hair | bristle bundle of FIG. 1 and FIG. 2 is expressed by one cylinder, it is the same as a normal commercial item, and a plurality (about 10-30 pieces) of fine diameter hair (made of resin) It is a bunch.

The point of the present invention is based on the following knowledge and ideas gained through daily examination of patients at the forefront of dentistry.
(1) Teeth become unhealthy due to food debris, etc., resulting in tooth decay and periodontal disease due to factors such as food debris that accumulates between the teeth. Can be maintained.
(2) Human teeth are almost the same, except for the lower anterior teeth, although they are large and small. For this reason, humans have an average tooth width or an average interval between adjacent teeth (distance) other than the lower anterior teeth.
(3) Since the hair bundle made of resin-made hair is easy to bend and rich in elasticity and flexibility, small individual differences can be easily absorbed by the flexibility. For example, a state in which only a few of a plurality of hairs of one hair bundle are inserted between teeth and the other most of the hairs are in contact with the tooth surface and bend can be easily made because of the above flexibility. Allow.
(4) In the structure of a toothbrush that can brush between teeth and brush the occlusal surface and gingiva, when inserting and penetrating the hairbrush of the toothbrush between the teeth, the hair bundle that interferes with the operation is minimized. It is important to. For this purpose, it is important to dispose the hair bundles in one row or two rows at least in the front region of the brush head. In addition, if the interval between the hair bundles in the row is set to the average distance between adjacent teeth of the human, cleaning between the teeth can be easily performed.
The toothbrush 10 shown in FIG. 1 and FIG. 2 is configured based on the idea of (1) to (4) above, and in the front region 11a of the brush head 11, two rows apart from the A row and the B row are arranged. The center-to-center distance W between the first hair bundle A1 in the A row and the next hair bundle A2, and the center-to-center distance W between the first hair bundle B1 and the next hair bundle B2 in the B row are average. The distance between adjacent teeth.

  Further, in this toothbrush 10, for the brushing between the teeth of the lower anterior teeth, the center-to-center distance F between the hair bundles A1 and B1 on the foremost side of the A row and the B row is set to be adjacent to the average lower anterior teeth. Interdental distance. The center-to-center distance F of the hair bundle is preferably about 3 mm to 6 mm, and the center-to-center distance F having high commonness is about 5 mm. This center-to-center distance F is the distance between the two frontmost hair bundles in the two front rows of the brush head when there are two rows of hair bundles in the front region, and the center-to-center distance F is the lower anterior teeth Is approximately equal to the interval between the teeth. However, since there are individual differences, the custom-made product may be less than 3 mm, for example, 2 mm. For this reason, it is possible to brush the interdental portion of the lower jaw front teeth by using the toothbrush 10 in an upright manner. As a result, all the interdental portions of the upper jaw and the lower jaw can be easily brushed, and they do not deteriorate and break in a short period of use unlike the interdental brush wire. The fact that all interdental brushing is possible will be described in detail later.

  FIG. 3 is a diagram illustrating the posture of the toothbrush when the entire interdental portion of the lower jaw is brushed. A human tooth model M is used. From the mesial side (anterior teeth) to the distal side (back teeth), the right side has seven teeth R1 to R7 and the left side has seven teeth L1 to L7. The tooth width d of the front teeth is much smaller than the tooth width D of other teeth (the tooth width of R4 is illustrated in FIG. 3). Therefore, the interval between the interdental portions of the lower anterior teeth is also smaller than the interval between the adjacent interdental portions of other portions. The distance between adjacent teeth is, for example, the distance between (interdental part between R3 and R4) and (interdental part between R4 and R5), that is, the distance between the interdental parts on both sides of R4. Say.

  First, when the front teeth are brushed between the teeth using the toothbrush 10 in the present embodiment, the toothbrush 10 is used upright as shown in FIG. Then, the hair bundles A1 and B1 can be inserted between the teeth on both sides of the L1 with the earliest hair bundles A1 and B1, for example, so that the reciprocating motion along the buccal and lingual directions can be performed. . Since the space between the teeth of the front teeth is narrow, when the hair penetration is difficult, the food residue is not likely to be clogged from the beginning, so that the brushing effect can be sufficiently obtained just by striking with the tip of the hair. That is, no food residue accumulates between the teeth without a slight gap, and no plaque adheres, so there is no need to forcibly pry it through the hair bundle. Further, there may be a state in which only a few of the many hairs constituting the hair bundle are inserted between the teeth, and the remaining many hit the tooth surface.

  For other than lower forehead teeth, as shown in FIG. 3, depending on whether front side (cheek side or lip side), back side (lingual side), right side or left side, use A row of hair bundles, B Use columns or change. However, unlike the front teeth, the toothbrush is used in a horizontal or oblique horizontal posture without standing. In the case of the right front side of FIG. 3, the hair bundles B1 and B2 having a center-to-center distance W are inserted between the root teeth on both sides of the teeth so as to sandwich the teeth, and penetrated into the cheek. Reciprocate in the tongue direction. The hair bundles B1 and B2 can be inserted in the same manner for R2 to R7 on the right front side. On the right back side of the back side, since the left and right sides of the brush head are reversed, the hair bundles A1 and A2 are inserted between the teeth on both sides of the teeth for brushing. On the left front side, as shown in FIG. 3, the hair bundles A1 and A2 are inserted between the teeth at the root portion. In this way, it is possible to easily brush all interdental portions of the lower jaw.

  It should be noted that the above-described hair bundle inserted between teeth cannot be passed between teeth without a slight gap, and does not need to be forced to pass. And two hair bundles (moving hair bundles) that are said to be inserted are listed two by two, and in the following explanation, two are listed as well, but there is no slight gap between the teeth corresponding to one of the two hair bundles Only one hair bundle needs to be passed through. Since the hair bundle is rich in flexibility, it is possible to easily penetrate one of the hair bundles between the teeth and poke the tip of the other hair bundle against the surface of the teeth. Both hair bundles can operate effectively to maintain dental health. In some cases, the toothbrush may be operated with the intention of using only one of the two hair bundles listed above and not using the other.

  FIG. 4 shows a maxillary tooth model M. FIG. The biggest difference with the lower jaw is that the front teeth are larger than that of the lower jaw. For this reason, in the upper jaw, the toothbrush is used sideways or obliquely sideways for the front teeth. The other teeth are the same as in the lower jaw. Tables 1 and 2 show how the toothbrush posture is used and which hair bundle is used depending on the position of the tooth.

  According to Tables 1 and 2, by using the toothbrush 10 of the present embodiment, it is possible to brush between the teeth of all teeth including the front teeth. Unlike the interdental brush using a wire, this interdental brushing does not cause tooth wear and the like, so that there is no significant adverse effect and excellent durability. For this reason, brushing between teeth can be easily made on a daily basis. In Table 1 and Table 2, two hair bundles (operational hair bundles) are listed, but (1) when both hair bundles are inserted between teeth on both sides of one tooth, (2 ) When only one of the hair bundles is inserted between the teeth and the other is brushing the front and back surfaces of the interdental part, (3) When both brush the front and back surfaces of the interdental part, (4) One hair bundle May be used when the other is used with the intention of not using it. That is, insertion between teeth is not essential. Moreover, even if it says that a hair | bristle bundle is inserted between teeth, it is not necessary to insert all the hair | bristle bundles. As described above, even if only a few of the many hairs of one hair bundle are inserted between the teeth, they are referred to as “operational hair bundles” shown in Tables 1 and 2. It should be noted that the arrangement of the bristles in the toothbrush of the present invention should be determined based on substantial contact with the teeth when the bristles of the toothbrush are applied to the dentition. Therefore, for example, the bristles shown in FIG. It should be understood that any number of rows of hair bundles shorter than the length of the bundle is additionally included in the scope of the present invention.

  Furthermore, as shown in FIG. 1, the toothbrush 10 according to the present embodiment includes the hair bundle C arranged densely and uniformly, so that the crown, occlusal surface, gums, and gums are brushed by the hair bundle C. be able to. For this reason, it is very useful for maintaining dental health.

  Here is one note. The above description is for a case where a human having an ideal tooth arrangement brushes two adjacent interdental portions simultaneously with emphasis on efficiency. In this case, it is possible to brush between two adjacent teeth at the same time, so that the user feels profitable and is actually efficient. However, there are actually people with poor tooth alignment, and depending on the physical condition and mood of the day, it may be troublesome to brush two interdental parts at the same time. In such a case, use only one hair bundle on the front side, insert the hair bundle only in one interdental region, and perform brushing by reciprocating along the cheek tongue direction. There may be. In this case, when there are two rows, when the hair bundle at the tip of one row is worn out, the hair bundle at the tip of the second row can be used instead of the worn hair bundle. And since there is an interval in the width direction between the two rows, the hair bundle at the tip does not get in the way.

  Therefore, FIGS. 3 and 4 and Tables 1 and 2 exemplify an ideal case where two adjacent interdental portions are brushed simultaneously using two hair bundles. Even in the embodiment described below, a case where two adjacent interdental parts are brushed at the same time will be described, but one interdental part may be brushed in order using one hair bundle, There are actually many such uses. However, even if a method of using brushing one interdental portion in sequence using one bristle bundle is used, it does not reduce the value of the toothbrush of the present invention. According to the configuration of the toothbrush of the present invention, it is possible to efficiently brush two interdental portions simultaneously as described above, and further, brushing is sequentially performed for each interdental portion with one bristle bundle. You can also. Even when brushing for each interdental part, because of the configuration in which the interval between the hair bundles is wide as described above, when the brushing of one interdental part is performed, the surrounding hair bundles may be obstructed by other teeth. There are also no advantages, and other advantages.

(Embodiment 2)
FIG. 5 is a diagram showing an electric toothbrush 10 according to the second embodiment of the present invention. This toothbrush 10 has the same brush head 11 as the manual toothbrush shown in FIG. Therefore, what has been described with reference to FIGS. If it demonstrates supplementarily, in an electric toothbrush, after inserting a hair | bristle bundle between teeth of a tooth root, it can brush by electric motion by applying electric power. This electric movement varies widely depending on the type of electric toothbrush, but in any case, a large massaging effect that is difficult to obtain manually for interdental brushing can be obtained by repetitive movement at a minute high frequency.

  Furthermore, in the electric toothbrush 10, the use shown in FIG. 6 can improve the circulation of the blood circulation of the mucous membrane of the tooth neck, and can obtain a remarkable effect in preventing alveolar pus leakage. In FIG. 6, the hair bundle C of the brush head is applied to the mucous membrane of the tooth neck. The resin bristles that form the hair bundle C are preferably softer than the hair bundles A1, A2, B1, and B2 in the front region.

(Embodiment 3)
FIG. 7 is a diagram showing the brush head 11 of the toothbrush according to the third embodiment of the present invention. The feature of the toothbrush in the present embodiment is that the next hair bundles A2 and B2 are located on the end side in the width direction of the brush head 11 with respect to the hair bundles A1 and B1 on the frontmost side of the A row and the B row. In the point. For this reason, the straight line connecting the earliest hair bundle and the next hair bundle in one row is inclined with respect to the axis of the toothbrush and has an inclination angle θ.

  With such an inclination angle, the effects shown in FIGS. 8 and 9 can be obtained. FIG. 8 shows the arrangement of the toothbrush when brushing between the teeth on the right back side of the lower jaw, and FIG. 9 is a view of the brush head 11 of the toothbrush as viewed from the back side (lingual side). When brushing the back side of the back teeth, the toothbrush must be tilted, and the brush head 11 is tilted as shown in FIG. If the inclination angle of the toothbrush in this case is matched with the inclination angle θ shown in FIG. 7, as shown in FIG. 9, the hair bundles A1 and A2 can be easily inserted between the teeth on both sides of R6. . For this reason, it is easy to brush the back teeth of the back side, which is not so simple, and it is beneficial to maintain the health of all parts. Note that the toothbrush of the present embodiment can be used not only for manual operation but also for an electric toothbrush.

(Embodiment 4)
FIG. 10 is a diagram showing a brush head 11 of a toothbrush according to a fourth embodiment given as a reference example different from the present invention. In the brush head 11 of FIG. 10, the hair bundles are arranged in two rows across the entire area of the brush head 11 with the interval W between the hair bundles, regardless of the front region and the rear region. In such an arrangement of the hair bundles of the brush head 11, brushing between the teeth of the lower jaw front teeth is performed for each tooth only by the hair bundle A1. Moreover, the brushing between other teeth is the same as the method by Embodiment 1-3. However, brushing between teeth may be performed one by one with only the hair bundle A1.

The arrangement of the hair bundle of the brush head 11 of the toothbrush of the reference example different from the present invention shown in FIG. 11 is a modification of the arrangement of the hair bundle shown in FIG. The hair bundle is composed of one row, and the interval between the hair bundles is the above-described interval W. Thus, interdental brushing can be performed by the same method as the hair bundle arrangement shown in FIG. That is, the interdental brushing of the front teeth is performed by the hair bundle A1, and the other interdental brushing can be performed using the two hair bundles A1 and A2. Also, brushing between all teeth can be performed using the hair bundle A1.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The toothbrush of the present invention can easily brush between teeth by a simple mechanism, and can greatly enhance the health of people, particularly the maintenance of the health of teeth of the elderly.

It is a figure which shows the toothbrush in Embodiment 1 of this invention. It is a perspective view which shows the brush head of the toothbrush of FIG. It is a figure which shows a toothbrush attitude | position when brushing between the teeth of a lower jaw tooth with the toothbrush of FIG. It is a figure which shows a toothbrush attitude | position when brushing between the teeth of the upper jaw tooth with the toothbrush of FIG. It is a figure which shows the toothbrush in Embodiment 2 of this invention. It is a figure which shows the state which massages the mucous membrane of a tooth neck part with the toothbrush of FIG. It is a figure which shows the brush head of the toothbrush in Embodiment 3 of this invention. It is a figure which shows a toothbrush attitude | position when inserting the brush head of the toothbrush of FIG. 7 between the back teeth of the lower right back side of a lower jaw. It is the enlarged view which looked at FIG. 8 from the lingual side. It is a figure which shows the brush head of the toothbrush in Embodiment 4 mention | raise | lifted as a reference example different from this invention. It is a figure which shows the modification of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Toothbrush (manual, electric), 11 Brush head, 11a Front side area | region, 11b Rear side area | region, 12 Toothbrush handle, 20 Mucosa, A1 A row | line | column tip hair bundle, A2 A row | line | column from the tip , Hair bundle at the tip of the B1 row B, second hair bundle from the tip of the B2 row B, densely distributed hair bundle in the C rear region, center distance between the two hair bundles at the tip F, M tooth model, W Center distance between the hair bundle at the tip of the row and the second hair bundle.

Claims (3)

The brush head is divided into a front region and a rear region,
In the front region, a plurality of hair bundles are discretely spaced apart from each other and arranged in a row along the longitudinal direction of the brush head, and the rows are spaced apart in the width direction. The interval in the width direction is 3 mm to 6 mm between the interdental portions of the lower jaw front teeth, and the interval in the longitudinal direction of the hair bundle in the row is substantially the average adjacent to the portion other than the lower jaw front teeth. equal to the spacing 5mm~11mm interdental portions fit rather,
The front region is occupied by the four rows of hairs in the two rows, the frontmost side and the position immediately behind it, and the rear region has densely and substantially evenly arranged hair bundles. A toothbrush characterized by comprising . In tufts of two rows before Kisaki side region than the first hair bundle earliest side of the front Symbol brush head, a second hair bundle immediately rear side, the width direction of the end of the brush head characterized in that located on the side, serial mounting of toothbrush to claim 1. Tufts of back region of the brush head, characterized in that the softer than tufts of the tip side region, toothbrush according to claim 1 or 2.

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