| 摘要 |
PROBLEM TO BE SOLVED: To provide a toothbrush, achieving excellent penetration performance into a narrow gap, and excellent cleaning performance. SOLUTION: A bristle 21 to compose a bundle of bristles comprises a core part 22, and a sheath part 23 surrounding the core part 22, forming a multi-core structure. It has a number of recessed parts 24 provided from the surface of the sheath part 23 toward the core part 22. The bristle 21 forms a taper part 25 of which thickness is gradually decreased toward the tip. COPYRIGHT: (C)2007,JPO&INPIT
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