MXPA98010579A - Brush for teeth with a part of brush replacement - Google Patents

Abstract

The present invention relates to a toothbrush comprising a handle, a head constructed as an open frame of at least one side, a brush part insertable on its open side and having a support and a front of bristles, also as fixing means in the form of projections and recesses of intercoupling inside the frame and on the support to fix the part of the brush, the frame has a jaw that supports the support in all its circumferential surface and on the head means are provided so that the toothless press the part of the brush. In order to separate the functions "sealed" and "fixation", inside the jaw of the frame and on its periphery the support are constructed as sealing surfaces of completely smooth walls and on the outside of the sealing surfaces, the fixing means have resilient seals displaced towards adent

Description

BRUSH FOR THE TEETH WITH A REPLACEABLE BRUSH PART Description of the invention The invention is concerned with a toothbrush with a handle, a head constructed as an open frame on at least one side, a brush part insertable on the side open and having a support and a front of bristles and with fixing means inside the frame and on the support to fix the brush part, the frame has a side plate or jaw that holds the support in the vicinity of its periphery and on the head means for the toothless that press the brush part from the back of the head. Brushes are known (US patent 403,350, US patent 1,148,566, US patent 1,711,621, US patent 2,326,632) in which the part of the brush having the bristle front is subsequently inserted into the actual brush body. This is often carried out for manufacturing reasons and particularly, if it is impossible to directly attach the bundles of bristles to the body of the brush, by thermal processes, such as welding, molding, etc. Constructions in which the brush part is separated from the body of the brush and can be replaced by another brush part (GB 1932/1910) are also known. Known constructions are not appropriate or only inadequately suited for toothbrushes.

REF. 29010 Brushes for teeth are required much more frequently than other types of brushes. The reason is frequent use, necessary for proper oral hygiene (up to three times a day) and the rapid wear resulting from this. In addition, even in the case of relatively limited wear which would be acceptable with other brushes, a toothbrush has to be replaced to always ensure optimum effectiveness. Due to the high consumption of toothbrushes, approximately 150 million per year in Germany, there is an increased problem of waste and protection of resources, because the fraction of the material that becomes unusable due to wear is extremely small in comparison With the total material and the total material discarded, even in the case of a 100% recycling, it can not be processed to the same product, because the recycled material no longer satisfies the high quality requirements that are vital, for example, for the material of the bristles of a toothbrush. Even if the known brushes with a replaceable brush part made it fundamentally possible to only replace the part of the brush after the wear, this problem has not been until now in the front and also the case of the standard brushes, such as cleaning brushes, brushes for the body, cosmetic brushes, etc., is relatively unimportant, because the period of use is much longer and the ratio of unusable and still usable material are not in the same disproportion as with toothbrushes. Finally, in relation to toothbrushes, the special characteristic must be taken into account that they must be correctly usable by humans of all age classes and all levels of education, in such a way that replacement of the Brush part should be possible in a very simple way and with a limited force expense, while at the same time the parts are joined properly safely. In the present there are essentially two systems in the market. In the case of the so-called replacement head brushes (or replaceable head) (EP 0,199,849 Bl, DE 94 20 405 Ul) the whole head with bristles is detachably fixed to the handle. The fixing means are located on the handle substantially transversely to its longitudinal axis and on a flange of the head and are brought into engagement by the assembly or assembly of the head and the handle in the axial longitudinal direction. Inversely, the two parts can be separated by pulling them in the longitudinal axial direction. These replaceable head brushes are satisfactory from the point of view of use and hygiene. In addition, the plastic fraction of the head, which becomes waste when the bristles wear out, is still considerable. The additional disadvantages arise that the fixing means are located in the transition area between the head and the handle, that is, in an area where the greatest bending forces act during use. However, it is precisely in this area that the toothbrush is weakened by the construction measures for the fixing means. This is particularly serious because, for reasons of use, between the handle and the head it is desirable to have a slender and optionally resilient neck, which can not be implemented with such replaceable head brushes. Therefore, either replaceable head brushes have been proposed, in which the head is fixed with the slender neck on the thicker handle. Thus, although the advantage of use is substantially maintained, this is obtained at the cost of a greater amount of plastic waste. In addition, the risk also arises with all replaceable head brushes which, in the case of incorrect fixation or a failure of the fixation system during use, can cause serious injuries in the oral cavity. With other known systems, to which the toothbrush belongs according to the preamble of claim 1, the bristles are fixed to a support in the form of a thin plate and the part of the brush is fixed in a replaceable manner in the frame or frame-like head (DE 30 38 895, 37 24 640). The support is provided on its circumferential surface with flange-like seals and the frame has corresponding channel-like depressions. At its rear part, the support also has a needle or pin, which engages in a hole in the bottom of the frame and forms an exposed pressure surface on the back of the head. The support is fixed on the head and can be expelled by pressing on the needle. The fraction of plastic to be replaced in the case of wear of the bristle is reduced to a minimum and the replaceable brush parts can be manufactured in a non-expensive manner due to the small amount of material used. However, problems of hygiene and construction arise compared to replaceable head brushes. In the space necessarily present between the support and the jaw of the frame, which dries only inadequately, there is a deposition of garbage and accumulation of bacteria. This applies to a greater or lesser extent for the entire space between the head and the support. Thus, on its side of the bristles, the support is provided with an elastic circumferential boundary (DE 37 24 640 C2), the rear part of which is sealingly engaged against the front face of the jaw of the frame. This presupposes corresponding tensile forces which pull the support to the frame and consequently high corresponding clamping forces. In turn, this makes insertion and ejection of the brush part more difficult. As the fixing is carried out by the self-closing, the fixing means must be of a correspondingly large volume nature, which requires a considerable wall thickness on the head. Even more complicated is a construction (DE 296 00 398 Ul), in which elastic flat seals are provided on all the sealing faces between the support and the frame, which by means of a correspondingly high pre-tension simultaneously retains the part of the brush . The pre-tension must be completely absorbed by the jaw of the frame, which necessarily widens after a short time and reliable retention of the brush part is no longer ensured. Other proposals (DE 91 09 625 Ul, DE 44 34 617 A1), which provide fastening rims of portion in portion on the circumference of the support, lead to a corresponding reduction of the sealing of the space, because the fixing edges and holes are located on the sealing surfaces and very close tolerances must be observed in order, on the one hand, to ensure a press fit of the sealing surfaces and, on the other hand, a reliable fixing. It is hardly possible to obtain such tolerances with injection molded parts and the inexpensive plastics required for the head and the handle. In addition, the jaw of the frame is constantly under elastic tension due to the clamping forces. Since the plastics are not resistant to stress underflow (cold flow), there is a very rapid decrease in the tensile force of the frame jaw, so that the space between the jaw and the support is extended and increased the infiltration of dirt and bacteria. Since the fatigue of the plastic and the resulting increase in tolerances can be noticed only by the user, he can only notice the failure of the fixing means when cleaning or brushing the teeth. If the part of the brush is separated during use, it can once again lead to injuries to the oral cavity and gums. A very stable and durable connection of the part of the brush and the head takes place in a known toothbrush (DE 41 04 314 Al) in which on the back of the support two mutually V-shaped flanges are formed, which pass over the entire length of the support. They fit into a slit in the opening of the head outward, in a V-shaped manner and which also passes over the entire length on its longitudinal axis. During insertion the ridges must be deformed inwardly and towards each other to such an extent that they can pass through the narrower cross-section of the V-shaped groove or groove and then expand into the groove. Thus, the elastically deformed portions of the fixing connection are located in the replacement part, where the fatigue of the material is less important. The forces of deformation on the edges required to produce and separate the fixing joint are so high that the part of the brush can only be pressed or leveled with the help of specially adapted tools. The need for such special tools not only leads to correspondingly high system costs for the consumer, but is detrimental to a practical acceptance of the system by the market. This also applies because it is not possible to satisfy a requirement to avoid injury, ie, a smooth shape of the back of the brush. In addition, this toothbrush is also completely unacceptable for reasons of hygiene, because the slit or groove and ridges form severe cracks, in which dirt, toothpaste residues and bacteria can deposit. The last disadvantage is somewhat reduced in another known construction (U.S. patent 4,543,679), since instead of the flanges an expanding pin or pin is provided, which is inserted in a hole that widens conically outwards at the bottom of the frame. The problem of the invention is to construct a toothbrush of the type mentioned above, that the special hygiene requirements are satisfied and the usage characteristics are improved.

According to the invention this problem is solved in that the mutually engaging surfaces on the jaw of the frame and on the periphery of the support are constructed as completely smooth wall sealing surfaces and the fixing means have resilient retainers displaced inwards with with respect to the sealing surfaces and which are located in a space between the bottom of the frame and the rear part of the support facing the same. An important advantage of the invention is that the functions of "sealing" and "fixing" are separated in construction. The smooth periphery on the support and the smooth contact surface of the jaw are the prerequisite for a completely satisfactory sealing engagement with each other of such surfaces. This can be helped by a slightly conical construction of these surfaces. As a result of the construction of the fixing means as resilient seals to the exterior of the sealing surfaces, the jaw of the frame is not placed under pre-tension by means of fixing and retaining forces and consequently the cold flow can not be presented here, in such a way that it can satisfy its sealing function for a long time. The cavities, spaces, etc., are avoided to such an extent that, in the desired manner, after use the toothbrush dries quickly and consequently the accumulation of bacteria is prevented, while the deposition or infiltration of bacteria is prevented. toothpaste residues, etc. The resilient seals ensure a functionally reliable fixation, but still allow for easier replacement. Since the fixing means are located exclusively inside the frame between its bottom or lower part and the rear part of the support, the external contour of the toothbrush in the vicinity of the head can be adapted optimally to the correct use proposed, for example smooth, rounded contours are ensured, in such a way that lesions of the oral cavity are avoided during oral hygiene, while the resilient retainers are positioned in an area where their sizing is not restricted by other circumstances of building. Therefore, they can be designed in such a way that their reliability of operation is maintained for a long period of time. All thin-walled frames are kept free of tension. The positioning of the fixing means on the one hand and the pressure surface for separation on the other, ensure that the part of the bristles does not separate in an untimely manner, because the pressure acting on the bristles during use does not it can lead to a release of the fixation system and instead, for this purpose, it is necessary to have a planned but limited pressure on the back of the head. The easy replacement capacity of the brush part encourages the use of this system by the user, particularly since there is the possibility of using parts of the brush with bristles having different hardness and positioning characteristics. In a preferred construction the resilient seals are formed in a manner projecting inwardly on the bottom of the frame and cooperate with depressions on the back of the support. An advantageous embodiment is characterized in that on the bottom of the frame forming the rear part of the head of the brush there is a through opening, whose wall is at least partially extended towards the resilient seals and because the support has a pin or needle that it engages in the through opening whose front face forms an exposed pressure surface for pressing the brush part or cooperates with a pressing surface on the frame. In this mode, the through hole with its sleeve-like wall fulfills several functions. First, you can guide the needle or pin on the support and secondly at least part of its wall serves to build the resilient seals, that is, to position and fix the support. Finally, the through hole or opening provides the possibility of constructing the pressing surface on the back of the head. It is formed either directly by the pin or needle that passes through the through hole, that is, by its exposed front face or is constructed as a part of the frame that closes the through hole on the back of the head and applied pressure to the pressure surface acts on the pin via the frame. If the pin is guided on the wall of the through hole, it is provided in its circumference with the depressions in which the seals on the frame jump from the outside. If the exposed front face of the pin forms the pressing surface, it projects advantageously outwards slightly on the frame contour or on the back of the head, which indicates its function and the pressure to release the fixing system can be applied without difficulty. In addition to the advantages of use, the aforementioned embodiment has the advantage that the toothbrush only comprises two components, that is to say, the handle with the head forming the frame and the part of the brush with the support and the bristles. Accordingly, the toothbrush can be manufactured in an easy and not expensive manner.

An embodiment that is somewhat more complicated from the point of view of manufacture, but offers the same advantages of use, is characterized in that the pin is placed in the through hole spaced from its wall and the support has depressions that engage externally on the walls. resilient seals. Preferably, the through hole on the back of the head is closed by a pressure plate which forms the pressing surface and which engages internally on the front face of the needle or pin. This construction has the advantage that the head of the toothbrush is completely closed at the back, where consequently there are no sealing problems with all its possible disadvantages. In this embodiment, the pressure plate forming the pressure surface can be made from a rubber-like material, for example, an elastomer and can subsequently be inserted on the rim of the through-hole and fixed, for example, by fixation on the wall of the opening or molded on the opening in a molding process. The pressure plate is deformable at least elastically to such an extent that, when pressure is exerted on the pressure plate, the distance necessary for the release of the support is covered. Thus, the pressure is applied by the pressure plate on the needle, in such a way that the support is displaced in the direction of pressure and the detents are released. Instead of this, the pressure plate can be in one piece with the head and can be either joined by a correspondingly thin wall thickness of the head in this area in a resilient manner to the remaining frame or this can be carried out by means of a flexible wall portion. If the pressure plate is of one piece, except for the resilient part of the head, the seals can be formed laterally to the pressure plate on the bottom of the frame and can be expanded from the fixing position fixing the support between them, by pressing on the support plate and accompanied by the release of the support. The spring characteristic of the seals can be obtained virtually with any plastic material disordered by a certain length of the seals, wherein the frame can be dimensionally stable. The spring characteristics can also be obtained by thinner wall portions on the back of the head, to allow movement with a limited travel of the pressure plate that is part of the frame. Furthermore, such flexible wall portions can be constructed in the area of the beginning of the frame retainers, in such a way that the pressure in the pressure plate gives rise to its displacement, also as an expansion of the seals, in such a way that the support is released from the fixing system and can fall downwards. Externally, the jaws are fully or partially coupled on the support, a complete coupling with a level joint of the external faces of the support and the jaw is advantageous in order to avoid corners, gaps, etc. Instead of this, the support can also be attached to the front face of the jaw and can be flush with its exterior. This creates an additional sealing surface. This construction also has no gaps or tiers, which help in the deposition of dirt. In another embodiment, the support has a circumferential boundary on the side opposite the bristle front and on which it engages externally on the jaw. This embodiment has the advantage that the support forms a closed surface not only in the area of the bristle front, but also on the sides of the head. It is mainly these areas which are brought into contact with the gums when the toothbrush is in use, so that by means of the smooth surface in this area, the risks of injury are prevented. further, the areas near the front of bristles, due to the toothpaste applied in them, have a particular tendency to the deposition of dirt, while also allowing the accumulation of bacteria. Due to the smooth construction, free of spaces and hollows of the support and its border that fits over the jaws, such problems are avoided. Both of the above mentioned modalities have the advantage that, for a given contour of the head, it is possible to provide a maximum number of bristles on the support. The construction of the invention of the frame also offers the possibility that the support is made from an elastomer and sealed against the jaw, which can be aided by sealing flanges. The construction of the invention of the frame ensures that the jaws grip and compress the elastomeric support similarly to the frame. Additional increased frictional forces are present in the area of the sealing faces, which reliably avoids the spaces. The ends of the bristles located in the support are resiliently supported. Finally, the pressure surface can be optically differentiated from the remaining framework by the design of the surface, to thereby indicate the function of the pressure surface to the user. This optical differentiation can be carried out by means of a corresponding profiling, a different material, a different coloring, etc.

At least in the area of the jaw, the frame may externally have a soft elastic cover in order to protect the mucosa. This can additionally cover the front face of the jaw and with its inner edge which is sealingly engaged on the supporting circumferential surface. Since in the case of the construction of the invention the fixing means are no longer located on the jaw of the frame, but instead only serve as guiding and sealing functions, they can be thinner than in known constructions. Conversely, the support surface and consequently the number of bristles or bundles of bristles can be increased or enlarged. The invention is described in greater detail hereinafter in relation to non-limiting embodiments and with respect to the accompanying drawings, wherein: Figure 1 is a partial representation of a toothbrush in a plan view of the back . Figure 2 is a section II-II of Figure 3. Figure 3 is a plan view of the front of the bristles. Figure 4 is a section IV-IV of figure 3.

Figure 5 is a longitudinal cross-section through the brush head for the teeth in another embodiment without the brush part. Figure 6 shows a bottom view of the head. Figure 7 shows a section corresponding to Figure 5 of another embodiment. Figure 8 is a bottom view of the head of the brush according to Figure 7. Figure 9 is a longitudinal section through the head of the brush in another embodiment. Figure 10 is a bottom view of the head according to Figure 9. Figure 11 is a longitudinal section through the head in another construction. Figure 12 is a bottom view of the head according to Figure 11. Figure 13 is a longitudinal cross-sectional view through the head of the brush in a modified construction. Figure 14 is a bottom view of the head according to Figure 13. Figures 15 to 22 are cross-sectional views of the head of the brush according to Figure 4, with a different construction of the frame and the support of the part of the brush. The toothbrush shown in Figures 1 to 3 comprises an elongate handle 1 shown in section, a head 2 and a replaceable brush part 3, having a support 4 with the front 5 of bristle bristles 6 of individual bristles. The head 2 of the toothbrush is constructed as a frame 7 in which the brush part 3 is replaceably inserted with its support 4. In all embodiments, the frame 7 has as a side boundary, a circumferential side plate or jaw 8, which is closed by a wall 9 towards the handle 1 (figures 2 and 4). With the wall 9, the circumferential jaw 8 forms a type of dimensionally rigid frame, which together with the rear part 10 forms an open downward cavity for receiving the support 4. In the embodiment according to FIGS. 1 to 4, the The frame also has an opening or through hole 11, the wall of which is at least partially formed by resilient seals 12 projecting into the cavity. The flat support 4 on the side of the bristle front 5 comprises a plate-like part 13, whose contour corresponds to the contour formed on the inside of the jaw 8 and the wall 9, also like a needle or pin 14, which passes through of the through hole 11 and is further guided therein. The needle or pin 14 has an exposed front face projecting slightly on the back 10 of the frame 7 and forming a pressing surface 15. As shown in Figure 1, this pressure surface can be optically differentiated, so Optional can also be profiled superficially. With the resilient detents 12 in the area of the through hole 11, hollows or fixing recesses 16 formed correspondingly are associated., on the support 4, which in the embodiment shown are located on the circumference of the needle 14 in the area of the transition to the plate-like part 13 and displaced inwards with respect thereto. From the position of use shown in Figures 2 and 4, the brush part 3 can be easily replaced by a new brush part, since with the finger a pressure acting in the direction of the front of bristles on the surface is exerted. 15 of pressure, under which the resilient detents 12 are withdrawn outwards, in such a way that part 3 of the brush separates downwards. The bristles 6 of the part 3 of the brush can be fixed in numerous different ways to the support 4, for example, in preformed holes, by means of elements of • fastening or adhesives, but can also be welded to the support or provided with thickened portions 17, molded therein. In the embodiment of Figures 5 and 6, the through hole 11 has an asymmetrical oval shape and its wall in the cavity of the frame 7 is elongated towards the resilient detents 12, which form a circumferential ring. The embodiment of Figures 7 and 8, differs from that of Figures 5 and 6, only in that the through hole 11 and the resilient retainer 12 are circular. In the embodiments according to figures 9 to 14, the wall of the through hole 11 projects only partially into the cavity to form the resilient retainer 12. Thus, figures 9 and 10 show a retainer 12 having a U-shape, while in the embodiment according to figures 11 and 12 the through hole 11 on the narrow sides of the bristle front forms two resilient seals 12 with an arched shape and in figures 13 and 14 the wall of the through hole on the longitudinal sides it is elongated to the opposed seals 12. Figures 15 to 22 show different constructions of the frame, support and fixing means. In the embodiment of FIG. 15, the support 4 once again has a plate-like portion 13 and a shoulder 14, also like the frame forming the head, in a manner very similar to the embodiment of FIG. 4. In contrast to FIG. the last embodiment, the part 13 similar to the plate of the support 4 forms the lower end of the head and the jaw 8 with its front face 18 forms a splice for the upper part of the part 13 similar to the plate of the support 4. Otherwise , the support 4 is terminated in a circumferentially level manner with the exterior of the jaw 8. In the embodiment of FIG. 16, the plate-like portion 13 of the support 4 is offset inwardly in a staggered manner on its upper part and engages with the harrow on the front face 18 of the jaw 8. The plate-like part 13 is guided with the stretch partly on the inside of the jaw 8. In this embodiment, an elastomer cover 28 is injected on the outside of the jaw. q uijada and protects the mucosa. The cover 28 can project on the front face of the jaw 8 and is sealingly engaged on the circumference of the plate-like portion 13. Unlike Figure 16, Figure 17 shows a support 4 with a plate-like part 13, which is once again mounted and guided on a step 19 on the inside of the jaw 8 of the head. In the embodiment according to FIG. 18, the support 14 has on its part 13 similar to a plate a border 20 stretched upwards, in which the jaw 8 engages on the inside, with a corresponding tier, another construction is shown in Figure 19, wherein the jaw 8, without an external step, engages behind the raised edge 20 of the support 4. In the embodiment according to Figure 20, the resilient detents 12 point outwards and the support 4 is provided. with protrusions or rods 21 projecting upwards forming the fixing holes 16, on which the detents 12 are externally coupled. The bolt 14 passes through the through hole 11 with a greater spacing of the wall in this mode. The through opening 11 is closed at the top by a pressure plate 22 which forms the pressing surface 14 and which at 23 is fixed or molded on the wall of the through hole 11. The pressure plate 22 has a construction similar to rubber (or rubber). The lower side of the pressure plate 22 engages on the front face of the needle 14. If pressure is exerted on the pressure surface 22, the pin 14 is moved downwardly. The rigid rods 21 on the support move the resilient detents 12 inward, which releases the support 4 with the bundles 6 of bristles. In the embodiment according to figure 21, the support 4 once again has a plate-like part 13 and a shorter needle 24 than in the preceding modes and which in its circumference forms the fixing holes 16 for the resilient retainers. 12. In the center, the frame 7 has a pressure plate 25, which is attached to the frame by means of resilient wall portions 26 of thin walls. Immediately immediately on the wall portions 26 there are resiliently shaped detents, which are once again joined by resilient wall portions 27 to the jaws 8 of the frame. In the case of pressure on the pressure plate 25, the detents 12 are expanded outwards (FIG. 22) as a result of the elastic wall portions 26 and 27, which release the support 4 with the bundles 6 of bristles in such a way that they separate down. As can be seen from the drawings, in all embodiments the coupling interior of the jaw 8 and the circumferential surface of the support 13 are smooth and slightly tapering inwardly conically, while the fixing means 12, 16 are displaced towards in on it. It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers. Having described the invention as above, property is claimed as contained in the following:

Claims (21)

1. Claims 1. A toothbrush with a handle, a head constructed as an open frame on at least one side, a brush part, insertable on its open side and having a support and a front of bristles and with means of fixing inside the frame and on the support to fix the part of the brush, the frame has a jaw that holds the support in the area of its periphery and also means for the toothless to press the part of the brush from the back of the head, characterized in that the front surfaces on the jaw of the frame and on the periphery of the support are constructed as sealing surfaces of completely smooth walls and facing the sealing surfaces, the fixing means have resilient inwardly displaced seals, which are located in a space between the bottom of the frame and the back of the support facing the same. The toothbrush according to claim 1, characterized in that the resilient seals are formed in a manner projecting inwardly on the bottom of the frame and cooperate with depressions formed on the back of the support. 3. The toothbrush according to claim 1 or claim 2, characterized in that the bottom of the frame has an opening or through hole, the wall of which is at least partially extended inward towards the resilient seals and because the support has a needle that engages in the through hole and whose front face forms a surface of opposing pressure to press the brush part or cooperates with a pressing surface on the frame. 4. The toothbrush according to claim 3, characterized in that the needle is guided on the wall of the through hole and has depressions on its circumference. The toothbrush according to claim 1 or claim 3, characterized in that the needle, with its exposed front face, projects slightly over the outline of the frame on the back of the head. The toothbrush according to claim 3, characterized in that the needle is placed in the through hole with a spacing of its wall and the support has depressions that engage externally on the resilient retainers. The toothbrush according to claim 3 or 4, characterized in that the through hole is closed at the back of the head by means of a pressure plate which forms the pressure surface and which on the inside is coupled on the front face of the needle. 8. The toothbrush according to claim 7, characterized in that the pressure plate is connected by means of a flexible wall portion to the remaining frame. 9. The toothbrush according to claim 7 or 8, characterized in that the pressure plate is constructed by itself in a flexible and resilient manner. The toothbrush according to claim 7 or 8, characterized in that the pressure plate is a part of a head piece. The toothbrush according to claim 7 or 9, characterized in that the pressure plate is made from elastic material, preferably an elastomer. The toothbrush according to claim 11, characterized in that the pressure plate is injection molded together with the head in a molding process. The toothbrush according to claim 7, characterized in that the pressure plate is constructed as a separate injection molding and fixed to the head. 14. The toothbrush according to claim 7, characterized in that the seals are formed laterally along the pressure plate on the frame and can be expanded from the fixing position fixing the support between them., by pressing on the pressure plate, accompanied by the release of the support. 15. The toothbrush according to claim 1, characterized in that the jaws of the frame are externally or partially coupled on the support. 16. The toothbrush according to claim 1, characterized in that the rear part of the support engages on the front face of the jaw and ends level with its exterior. 17. The toothbrush according to claim 1, characterized in that a circumferential border is provided on the back of the support, with which the jaw is externally coupled. 18. The toothbrush according to claim 1, characterized in that the support is made of an elastomer that seals against the jaw. 19. The toothbrush according to claim 1 or 3, characterized in that the pressure surface is optically differentiated with respect to the head by designing the surface. 20. The toothbrush according to claim 1, characterized in that, at least in the area of the jaw, the frame is provided externally with a soft elastic cover to protect the mucosa. The toothbrush according to claim 1 and 20, characterized in that the cover covers the front face of the jaw and is sealingly engaged therein with the support.