| 摘要 |
PROBLEM TO BE SOLVED: To provide a toothbrush which has an excellent plaque removing function at mouth disease liable sites, safety for mouth soft tissue, and appearance difference and usability by setting the hole rim interval between proximate bristle planting holes and the total cross section of bristles planted in the planting holes to an optimum value. SOLUTION: This toothbrush is produced by planting bristle bundles 1 formed by bundling a plurality of bristles 2 and folding the bundles double with a flat piece 3 and then planting them into planting holes 4 in a bristling face 5 on a head part. Concerning at least part of planting holes, the hole interval L between arbitrary nearest bristling holes 4 is set at a value not larger than 1.0 mm and the total of bristle cross section areas per a hole is made not higher than 1.0 mm<SP>2</SP>in a condition that the bristles 2 planted into the planting holes 4 are folded double. COPYRIGHT: (C)2004,JPO
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