| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-quality toothbrush with high durability against opening of bristles and against bending of bristles because filament made of polyester resin is used as the bristles. SOLUTION: Tufts of bristles f including polyester resin are planted in a part or the whole of a plurality of tuft holes 3 disposed in a block head of the toothbrush. The opening rim 3a of each tuft hole 3 is beveled. COPYRIGHT: (C)2007,JPO&INPIT
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