KR20080109587A - Toothbrush, as well as toothbrush head therefor - Google Patents

Abstract

The present invention relates to a toothbrush head having a bristle support on which a bristle arrangement which has a large number of filaments is arranged, wherein at least one filament is tapered in the direction of its free end, and also to a toothbrush having a toothbrush head of this type. The invention proposes providing the tapered area at the tip of the at least one filament with a shape which deviates from a rotationally symmetrical form in order to maintain a high bending stiffness of the filament in one direction. According to the invention, the tapered area is in the form of a pressed-flat sharpened area, so that the filament has a greater bending stiffness in the region of the tapered area with respect to a first transverse axis than with respect to a second transverse axis which is at right angles to said first transverse axis. The filament cross section in the region of the pressed-flat sharpened area has a longitudinal axis or long main axis and a shorter transverse axis or short main axis, as a result of which the filament is provided with different geometric moments of inertia with respect to the two said axes in the region of the sharpened area. The pressed-flat sharpened area at the tip of the filament facilitates penetration into the interdental spaces, wherein the higher geometric moment of inertia of the broad side reduces bending here. ® KIPO & WIPO 2009

Description

Toothbrush and Toothbrush Heads {TOOTHBRUSH, AS WELL AS TOOTHBRUSH HEAD THEREFOR}

The present invention relates to a toothbrush head having a bristle carrier, comprising a bristle portion comprising a plurality of filaments, wherein at least one filament is tapered at the free end of the filament and a toothbrush having such a toothbrush head. .

It has already been proposed to form a toothbrush with bristles, such that the filaments of the toothbrush are smaller in diameter at the free end than at the base. This generally conical or nose cone shaped taper is intended to make the filament easier to penetrate into the spaces between the teeth and to better brush the spaces between the teeth. However, the taper of the filaments decreases the bending strength, which results in disturbing or causing the aforementioned penetration. If the geometric moment of inertia of the filament is reduced, the filament may have excessive ductility in the direction of the space between the teeth and no longer penetrate into the space between the teeth.

JP 11-075939 describes a bristle placement for a toothbrush that is tapered at the tip of the bristles, but this bristle placement does not guarantee a substantial improvement in penetration into the spaces between the teeth. Further, US 2005/0172436 proposes a bristle bundle comprising a plurality of filaments having inclined heads, each filament having a gradually varying length. However, if there are not enough protrusions or tapers at the free ends of each filament itself, such bristle bundles do not actually make the penetration into the spaces between the teeth simple.

The present invention is based on the object of developing an improved toothbrush head of the type described above, which can overcome the disadvantages of the state of the art in the art, and proposes further developments that are beneficial to the toothbrush head. The present invention aims, in particular, to improve the penetration of filaments into the spaces between the teeth.

According to the invention, this object is achieved by using a toothbrush head according to claim 1. Preferred embodiments of the invention are subject of the dependent claims.

The present invention proposes to provide a taper at the ends of one or more filaments having shapes other than rotationally symmetrical shapes so as to maintain greater bending strength of the filament in one direction. According to the present invention, the taper in the form of a flat crimped portion is formed such that the tapered region of the filament has a greater bending strength relative to the first abscissa than the bending strength with respect to the second abscissa extending perpendicular to the first abscissa. Form. In the area corresponding to the flat crimped part, the filament cross section has a longitudinal axis or a long axis as well as a shorter transverse or short axis, respectively, so that the filament has the two axes described above in the area corresponding to the cut part. Have different geometric moments of inertia. The flat squeezed cut at the end of the filament simplifies penetration into the interdental space and prevents bending of the filament due to the larger geometrical moment of inertia on the wide side (not tapered). The flat crimped cut or taper of the filament is consequently limited to one side or opposite opposing sides of the filament end. In this context, the term 'flat pressed' refers to the filament's geometry (as described above) rather than the method of making the filament.

According to an advantageous further development of the invention, the free end of the filament is cut into a wedge shape. In this case, the cut portion may be formed with only one inclined surface extending at an acute angle with respect to the longitudinal axis of the filament. Alternatively, the wedge-shaped portion may be formed of two opposing inclined surfaces that are inclined at an acute angle to each other such that the free ends of the filaments have a substantially gable roof-like appearance.

According to a further development of the invention, one or more inclined surfaces forming the wedge-shaped portions of the filaments may be formed in a plane. Alternatively, the sloped surface also has a curved surface that is preferably formed uniaxially. According to an advantageous embodiment of the invention, the at least one inclined surface is a convex curved surface, the axis of which may extend perpendicular to the longitudinal axis of the filament. Alternatively or additionally, the inclined surface may also be convexly curved about an axis located in the plane bearing the longitudinal axis of the filament.

According to a further development of the invention, the one or more inclined surfaces may also be concave curved surfaces, the axis of the curved surface extending perpendicular to the longitudinal axis of the filament and / or located in the plane bearing the longitudinal axis of the filament as described above.

The flat crimped cut portion is advantageously characterized in that there is a rounded portion at the edge of the cut portion at the end of the filament. This allows simple penetration of the spaces between the teeth, while allowing soft brushing of the teeth and preventing gum injuries.

It is possible to round off the cutout, at the front side, in particular at the end of the filament and / or towards the side. According to one advantageous embodiment of the invention, the free end of the filament may be characterized by a blunt top or the remaining surface which is connected to the inclined surface of the cut portion via the aforementioned rounded portion. The thickness of the blunt top remaining after cutting has, in principle, different dimensions depending on the required or desired sharpness, or the particular application. According to one advantageous embodiment of the invention, the blunt top described above may have a thickness corresponding to about 1/5 to 2/5 of the filament diameter.

In addition, the inclinations of the aforementioned inclined surfaces with respect to each other or to the longitudinal axis of the filament can also be chosen in principle differently. In one further development of the invention, an advantageous compromise between sufficient strength design and sufficient residual strength to allow penetration into the interdental space is that the wedge angle of the cutout is less than 40 °, preferably less than 30 °. Is obtained. According to one advantageous embodiment of the invention, the cut portion may be formed at a wedge angle in the range of 15 ° to 25 °.

The at least one filament has, in principle, a different cross sectional shape in the uncut portion. According to one advantageous embodiment of the invention, the filaments have a round cross section at the uncut portion.

In order to prevent excessive weakening of the entire filament with sufficient taper, which still simplifies penetration into the spaces between the teeth, a further development of the present invention is that the cut portion is about 1/8 to 4/8 of the total length of the filament , Preferably extending over 3/8.

It is advantageous for the one or more filaments to be specially arranged and placed in the bristle carrier, ie the flat crimped cuts can easily penetrate into the spaces between the teeth and move while wiping in the spaces between the teeth, i.e. It is advantageous to have the filament have greater bending strength while moving parallel to the axis. If the bristle head is properly oriented with respect to the dentition, one or more filaments may be arranged in the bristle carrier, in particular in which the long axis of the cross section of the cutout may be arranged parallel to the space between the teeth, ie the longitudinal axis of the bristle carrier. Alternatively, the longitudinal axis of the toothbrush may be arranged such that it is positioned substantially tangentially to the curved portion of the tooth.

In this case, the filaments may each be aligned differently to the bristle carrier, depending on the design of the toothbrush or the design of the toothbrush head.

When the toothbrush head forms part of a manual toothbrush, the filaments are advantageously aligned such that the long axis of the cross section of the cut portion extends perpendicular to the longitudinal axis of the toothbrush. When the cut portions are formed with two inclined surfaces inclined with respect to each other as described above, the convex portions formed in this way extend perpendicularly to the longitudinal axis of the toothbrush between the two inclined surfaces.

Alternatively, the toothbrush head can also be designed for an electric toothbrush. In this case, the filaments cut along the formed axis of movement can be arranged differently and aligned. According to one advantageous embodiment of the invention, the toothbrush head can be driven to oscillate with a bristle carrier rotating about a drive shaft extending parallel to the longitudinal axis of the toothbrush. In this case, the one or more filaments with the flat crimped portion are aligned similar to the manual toothbrush described above. The major axis of the cross section extends perpendicular to the longitudinal axis of the toothbrush.

Alternatively, the toothbrush head also features a bristle carrier that can be driven to vibrate while rotating about a transverse axis extending approximately perpendicular to the longitudinal axis of the toothbrush. In this case, the at least one filament with the flat crimped portion is advantageously located in the bristle placement which is located approximately at the center of rotation of the bristle carrier in the longitudinal axis of the toothbrush, wherein the bristle placement described above extends over different angles. But may extend over an angle corresponding to less than 45 °, in particular less than 30 °. When the toothbrush head is properly positioned so that the bristle carrier is approximately tangentially aligned with the curved portion of the tooth, the filaments disposed in these two parts or at an angled sector exhibit a movement that extends approximately in the space between the at least slotted teeth. Perform. In this case, it is advantageous to align the filaments such that the long axis of the cross section of the cut portion of the filament extends perpendicular to the longitudinal axis of the toothbrush.

The bristle placement of the toothbrush head usually consists of several filament bundles or bristle bundles, and other tooth care elements such as toothbrushing strips, plastic wipers or elastomer wipers may also be provided if necessary. One or more filaments of the one or more bristle bundles are formed as described above. The bristle arrangement advantageously comprises one or more bristle bundles, the majority of the filaments being formed in the manner described above. The filaments in one bristle bundle are preferably aligned at least approximately equally, ie the long axis of the cross section of the cut portion extends in the same direction in all the filaments of the bristle bundle.

In order to form the cut portion of one or more filaments, in principle, various methods can be envisioned. According to one preferred embodiment of the invention, the cut portion, in particular one or more inclined surfaces and / or rounded portions that limit such inclined surfaces, is formed by grinding the finished bristle carrier fitted with the bristle placement.

These and other features of the present invention, as well as those described in the claims, are set forth in the preferred embodiments and the corresponding drawings, which are described below, and these features are individually or sub-combinations of the combinations, regardless of the combinations in the claims. The object of the present invention can be limited in the form.

1 is a side view of a filament of a toothbrush cut in a wedge shape in accordance with a preferred embodiment of the present invention.

FIG. 2 is a side view of the filament according to FIG. 1 rotated by 90 ° with respect to FIG. 1, showing one of the inclined surfaces viewed from above. FIG.

3 is a side view of a filament cut into a wedge shape according to another preferred embodiment of the present invention.

FIG. 4 is a side view of the filament according to FIG. 3 rotated by 90 ° with respect to FIG. 3, showing an obliquely cut surface viewed from above.

5 is a side view of a filament cut into a wedge shape according to another preferred embodiment of the present invention.

FIG. 6 is a side view of the filament according to FIG. 5 rotated by 90 ° with respect to FIG. 5, showing one of the inclined surfaces viewed from above. FIG.

7 is a side view of a filament cut into a wedge shape according to another preferred embodiment of the present invention.

FIG. 8 is a side view of the filament according to FIG. 7 rotated by 90 ° with respect to FIG. 7, showing a view from above of one of the inclined surfaces.

9 is a cross-sectional view of a filament with both sides cut off and the inclined cut surface being convexly curved in accordance with one advantageous embodiment of the present invention.

FIG. 10 is a cross-sectional view of a filament in which both sides are cut and the slanted surface is concavely curved in accordance with one advantageous embodiment of the present invention.

11 is a top view of a manual toothbrush having a toothbrush head in accordance with one preferred embodiment of the present invention.

12 is a plan view of an electric toothbrush with a toothbrush head in accordance with one preferred embodiment of the present invention, which can be driven to oscillate while rotating about the longitudinal axis of the toothbrush.

13 is a plan view of a powered toothbrush having a toothbrush head in accordance with one preferred embodiment of the present invention, wherein the bristle portion of the powered toothbrush can be driven to oscillate while rotating about a transverse axis.

1 and 2 show a filament or toothbrush filament 1 inserted into the bristle carrier 2 of the toothbrush head, which is not shown in detail in FIGS. 1 and 2. The filament 1 has a basically cylindrical shape at the base of the filament, and both sides are cut off at the free end 3 of the filament 1. In the embodiment according to FIGS. 1 and 2, the cutout part 4 of the free end 3 of the filament 1 consists of two opposing inclined surfaces 5 and 6, which in the illustrated embodiment. It is inclined and flat with respect to each other at an acute angle. In the illustrated embodiment, the two inclined surfaces 5 and 6 have a wedge angle 7 of approximately 20 ° to 25 °, and the two inclined surfaces 5 and 6 have a flat ridge at the free end 3. It is arranged to be formed.

In the embodiment shown, the cutout part 4 is formed in a blunt form at the head of the cutout part. The inclined surfaces 5 and 6 do not fully converge at the free end 3 into the correct line, but form a blunt, roughly square head surface 8 slightly spaced from each other.

According to FIG. 1, at the edge of the front part of the inclined surfaces 5 and 6, a rounded portion 12 is formed which forms a transition between the respective inclined surfaces 5 and 6 and the blunt head surface 8. The rounded part 12 follows the overall outer contour of the inclined surfaces 5, 6.

In this case, in the illustrated embodiment the cutout part 4 is formed in such a way that it extends over a length 10 corresponding to approximately 3/8 of the total length 11 of the filament 1. In the embodiment shown, the thickness 9 of the blunt head surface 8 corresponds to approximately one quarter of the filament diameter.

In the variant of the embodiment shown in FIGS. 1 and 2, the cut portion 4 of the filament 1 also extends at an acute angle with respect to the longitudinal axis of each filament 1 as shown in FIGS. 3 and 4. It may be formed by a single inclined surface (5). The inclined surface 5 is advantageously inclined less sharply with respect to the longitudinal axis of the filament than the cut off on both sides. In the embodiment according to FIG. 3, the inclination angle of the inclined surface 5 once again corresponds to approximately 25 °, so that the overall wedge angle 7 of the cutout 4 is also approximately 25 ° in this case. The inclined surface 5 is also formed flat in the embodiment shown in FIGS. 3 and 4 such that the elliptical shaped inclined surface 5 shown in FIG. 4 is connected with the shape of the basically cylindrical filament 1.

In the embodiment according to FIGS. 3 and 4, the edge of the front part of the inclined surface 5 is also advantageously rounded. In the embodiment shown in FIGS. 3 and 4, the inclined surface 5 is also connected to the blunt head surface via the rounded portion 12. In this case, the cut portion 4 also extends over the entire length 10 corresponding to approximately 3/8 of the total length 11 of the filament 1, the thickness 9 of the blunt head surface 8 being The inclined surface 5 is selected to correspond to approximately one quarter of the total thickness of the filament 1.

The embodiment shown in FIGS. 5 and 6 essentially corresponds to the embodiment shown in FIGS. 1 and 2, in which case the slopes 5 and 6 are not flat and extend perpendicular to the longitudinal axis of the filament. It is curved concave about the axis which becomes. According to FIG. 5, in this case, the closer the free end 3 of the filament 1, the smaller the wedge angle 7 between the inclined surfaces 5 and 6. However, this wedge angle is also advantageously less than 40 °, preferably between 15 ° and 35 °.

In addition, the embodiment according to FIGS. 7 and 8 also corresponds to the embodiment according to FIGS. 1 and 2 in which both cutouts are shown, in which case the inclined surfaces 5 and 6 are convex, ie free of filaments. Closer to stage 3 is a convex curved surface about a curved axis extending perpendicular to the longitudinal axis of the filament so that the wedge angle 7 between the inclined surfaces 5 and 6 becomes larger. The wedge angle is also advantageously in this case between 15 ° and 35 °.

Alternatively or additionally, the inclined surfaces 5 and 6 may be convex or concave surfaces about a curved axis extending in the plane bearing the longitudinal axis of the filament. FIG. 9 shows such convex curved surfaces, while FIG. 10 shows the concave curved surfaces of the corresponding inclined surfaces 5 and 6.

The cutout part 4 and the rounded part 12 can be formed by grinding the filaments of the finished bristle carrier 2 into which the bristle arrangement is fitted.

One commonality of the filaments 1 shown in FIGS. 1 to 10 is that the cut portions 4 essentially have a wedge shaped structure, and the filaments 1 are perpendicular to each other in the region of the cut portions 4. Or have different geometric moments of inertia with respect to axes extending perpendicular to each other. The filament has a greater bending strength in the major axis direction 13 (see FIGS. 2, 4, 6 and 8) than in the short axis direction in the cross section of the cutout portion 4. In other words, it means that the filament 1 bends less when it is bent parallel to the inclined surfaces 5 and 6 of the cut portion, and bends better when it is bent perpendicularly to the inclined surfaces 5 and 6. do.

In the case where the toothbrush is properly positioned on the curved part of the tooth, the filament 1 is advantageously arranged such that the major axis direction 13 of the cross section extends parallel to the space between the teeth in the shape of a slot. According to FIG. 11, the filaments 1 may be combined to form a bristle bundle 14, and as a whole may form a bristle portion 15 disposed on the bristle carrier 12 of the toothbrush head 17. When the toothbrush head 17 forms part of a manual toothbrush as shown in FIG. 11, the filament 1 is aligned with the long axis of the filament cross section extending in the direction of the arrow 13 perpendicular to the longitudinal axis of the toothbrush.

This applies similarly when the toothbrush head 17 is for a powered toothbrush, with the bristle carrier 2 rotating about a drive shaft 18 extending parallel to the longitudinal axis of the toothbrush as shown in FIG. 12. Can be driven to vibrate. The oscillating movement about the drive shaft 18 is indicated by arrows 19. In this case, the filament 1 has its long axis aligned in the direction of the arrow 13, which is a direction extending perpendicular to the longitudinal axis of the toothbrush and thus perpendicular to the drive shaft 18.

In the electric toothbrush shown in FIG. 13, the bristle carrier 2 is formed substantially in the shape of a disk, or is formed in an elliptic shape, for example, and can be driven to vibrate while rotating about the drive shaft 18. In this case, the drive shaft 18 is located substantially perpendicular to the longitudinal axis of the toothbrush. In this case it is advantageous to cut only the filaments 1 in a few bristle bundles as described above. This relates to the bristle bundles 20 and 21, in particular sectors 22 and 23 of the angle of the bristle region 15 having an approximately cylindrical or totally elliptic shape, the sector of the toothbrush being of the toothbrush. It is located on the longitudinal axis and is disposed symmetrically with respect to the longitudinal axis of the toothbrush at the center of rotation of the bristle carrier 2. In the illustrated embodiment, the aforementioned angled sectors 22 and 23 may each occupy different predetermined angled sectors corresponding to, for example, about 30 degrees. The bristle bundles 20 and 21 located at the edges of the bristle portion 15 at sectors 22 and 23 at an angle have a movement extending approximately parallel to the space between the slot-shaped teeth. When the bristle carrier 2 is located at its center of rotation, the long axis of the cross section of the filament 1 extending in the direction of the arrow 13 is also advantageously aligned perpendicular to the longitudinal axis of the toothbrush.

Advantageous further developments are directed to sectors 24 and 25, which optionally form bristles 15 and are arranged to face and face neighboring sectors 22 and 23 at an angle. In the sectors 24 and 25, the filaments 1 are arranged in the bristle bundles 26 and 27 such that the long axis of the cross section of the cutout 4 extends in the direction of the arrow 13 perpendicular to the longitudinal axis of the toothbrush. This means that the cut portions 4 of all the filaments 1 in the bristle region 15 are aligned parallel to each other. When the bristle carrier 15 moves to vibrate while rotating along the arrow 19, the direction of movement of the filament 1 of the bristle bundles 26 and 27 in the sectors 24 and 25 is determined by the cutout portion 4. It extends approximately perpendicular to the cross section short axis. This means that the filaments 1 of the bristle bundles 26 and 27 have little resistance in the area of the cutout 4 to bending. Thus, the filament 1 can be easily bent in the sectors 24 and 25 in contact with the gums during brushing. This prevents the gums from hurting.

Another advantage of aligning the cut portions 4 of all filaments 1 in the bristle portion 15 in parallel is that the production is simple, for example when the cut portions 4 are ground simultaneously for all the filaments 1. It can be seen from the fact that

Claims (30)

And a bristle portion 15 having a plurality of filaments 1 disposed on the bristle carrier, the one or more filaments 1 being tapered at the free end 3 of the filament, The taper is in the form of a cut portion 4 that is pressed flat against the filament 1 with a greater bending strength than the bending strength with respect to a second transverse axis extending perpendicular to the first transverse axis in the tapered region. Toothbrush head, characterized in that formed. The toothbrush head (1) according to claim 1, wherein the cut portion (4) is formed in a wedge shape. 3. The at least one filament (1) according to claim 1 or 2, wherein the at least one filament (1) extends approximately parallel to the space between the teeth of which the long axis of the cross section of the cut portion (4) is slot-shaped so that the toothbrush head is properly positioned relative to the teeth. Toothbrush head being aligned on the bristle carrier (2) such that the longitudinal axis of the toothbrush is approximately tangential to the curved portion of the tooth. The method according to any one of claims 1 to 3, wherein at least one portion of the greater bending strength with respect to movement in the teeth extends parallel to the space between the teeth so that the toothbrush head is properly positioned relative to the teeth. The filament (1) is a toothbrush head that is aligned on the bristle carrier (2) such that the longitudinal axis of the toothbrush is approximately tangential to the curved portion of the tooth. 5. The toothbrush head according to claim 1, wherein the cutout portion is formed by an inclined surface that is inclined with respect to the longitudinal axis of the filament at an acute angle. 6. 5. The toothbrush head according to claim 1, wherein the cutout portion 4 is formed by two opposing inclined surfaces 5, 6 which are respectively inclined with respect to the longitudinal axis of the filament at an acute angle. . The toothbrush head according to claim 5 or 6, wherein the inclined surface (5) or inclined surfaces (5, 6) are formed flat. The toothbrush head according to claim 5 or 6, wherein a curved surface is provided on at least one inclined surface (5, 6). The toothbrush head according to any one of claims 1 to 8, wherein the curved surface is formed in a single axis. 10. The toothbrush of claim 8 or 9, wherein the curved surface is convex. The toothbrush head of claim 7, wherein the curved surface is concave. 12. Toothbrush head according to any one of the preceding claims, wherein the edge of the cutout portion (4) is provided with a rounded portion (12) at least with respect to the free end (3) of the filament (1). 13. The toothbrush head according to claim 12, wherein the rounded portion (12) follows the overall outer contour of the inclined surface (5, 6). 14. Toothbrush head according to any one of the preceding claims, wherein the cutout portion (4) has a blunt head surface (8). 16. Toothbrush head according to any one of the preceding claims, wherein the blunt head surface (8) has a thickness of approximately 1/5 to 2/5 of the filament diameter. 16. The toothbrush head according to any one of the preceding claims, wherein the cutout portion (4) has a wedge angle (7) of less than 40 °, preferably less than 30 °. The toothbrush head according to claim 1, wherein the wedge angle (7) is between 15 ° and 25 °. 18. A toothbrush head according to any of the preceding claims, wherein the filament (1) has a cylindrical contour in the uncut area. 19. The cut portion (4) according to any one of the preceding claims, wherein the cut portion (4) is approximately 1/8 to 4/8, preferably approximately 3/8 of the total length (11) of the filament (1). Toothbrush head that is extended on. 20. A toothbrush head according to any one of the preceding claims, wherein the cut portion (4) is formed by grinding. 21. The toothbrush of claim 1, wherein the toothbrush head is formed in the form of a manual toothbrush head. 21. The toothbrush head according to any one of the preceding claims, wherein the toothbrush head is formed in the form of an electric toothbrush head and the bristle carrier 2 rotates about a drive shaft 18 extending parallel to the longitudinal axis of the toothbrush. Toothbrush head that can be configured to vibrate while. 23. The toothbrush head according to claim 21 or 22, wherein the at least one filament (1) is aligned with the long axis of the cross section of the cut portion (4) perpendicular to the longitudinal axis of the toothbrush. 21. The toothbrush head according to any one of claims 1 to 20, wherein the toothbrush head is formed in the form of an electric toothbrush head, and the bristle carrier 2 rotates about a drive shaft 18 extending perpendicular to the longitudinal axis of the toothbrush. Toothbrush head that can be configured to vibrate while. 25. The one or more opposing sectors of claim 22, wherein at least one filament 1 bears the longitudinal axis of the toothbrush at the center of rotation of the bristle carrier 2. 23, symmetrically with respect to the longitudinal axis of the toothbrush, wherein the at least one filament 1 is such that the long axis of the filament cross section at the rotational center position of the bristle carrier 2 is aligned perpendicular to the longitudinal axis of the toothbrush. head. 26. A toothbrush head according to any one of the preceding claims, wherein the predetermined angled sectors (22, 23) extend over an angle range of less than 45 degrees, preferably less than 30 degrees. 27. The two opposing predetermined according to any one of claims 24 to 26, wherein at least one filament 1 is located on an axis aligned perpendicular to the longitudinal axis of the toothbrush at the center of rotation of the bristle carrier 2. Disposed in angular sectors (24, 25), wherein the at least one filament (1) is such that the major axis of the cross section of the filament is aligned perpendicular to the longitudinal axis of the toothbrush at the center of rotation of the bristle carrier (2). 28. The bristle bundle (14) according to any one of the preceding claims, wherein the filaments (1) are combined to form a bristle bundle (14, 20, 21, 26, 27) on the bristle carrier (2). At least three quarters of all filaments 1 having cutouts 4, 20, 21, 26, 27 are filaments 1 with cutout portions 4 flattened, preferably identical bristle bundles. Toothbrush head, wherein all filaments (1) at (14, 20, 21, 26, 27) are aligned identically. 29. The cut portion 4 according to any one of the preceding claims, wherein the cut portion 4 is such that the bending strength of the filament 1 with respect to the first transverse axis is at least 20% greater than the bending strength with respect to the second transverse axis. Preferably the toothbrush head is formed to be greater than 35%. 30. A toothbrush comprising a toothbrush head according to any one of claims 1 to 29.

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