| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a toothbrush which has an improved scraping out power in the back teeth and which is capable of cleaning the narrow and small part of the interdental part and the cervical area of teeth and the like favorably. <P>SOLUTION: On the bristle implanting surface 6, a tip side region which is the region on a head part tip 7 side, and a base-end side region which is the region on a handle part 2 side are formed. In the tip side region, tip side bristle bundle groups 20, where a plurality of bristle bundles are lined and planted from the head part tip 7 to the handle part 2 side, are provided. In the tip side bristle bundle groups 20, the angle of the handle part 2 side formed by the length direction of an arbitrary bristle bundle constituting the group and the bristle planting surface is smaller than the angle of the handle part 2 side formed by the length direction of the other bristle bundle adjacent to that arbitrary bristle bundle at the handle part side and the bristle implanting surface 6. In the base-end side region, base-end side bristle bundle groups 10, where a plurality of bristle bundles are planted almost vertically to the bristle implanting surface 6, are provided. The bristle elasticity strength ratio expressed by [bristle elasticity strength at the actual length of the tip side bristle bundle group]/[bristle elasticity strength at the actual length of the base-end side bristle bundle group] is 1 or stronger. <P>COPYRIGHT: (C)2012,JPO&INPIT |
