| 摘要 |
PROBLEM TO BE SOLVED: To provide a toothbrush which can well clean up the deepst part of an interdentium and gives a bushing and insertion feeling. SOLUTION: With the toothbrush 10 with two or more kinds of hair bundles 12A, 12B, 12C of different hair lengths implanted on a hair implanting stand 14, the hair bundles 12A, 12B, 12C are composed by bundling bristles 11A, 11B, 11C each tapered toward the tip, and the longer the lengths of hair bundles 12B, 12C, the finer the bundle radius, and the smaller the tapered angleαof the tapered tip part 16 of the bristles 11B, 11C. The length of the hair bundle 12B at center in the direction orthogonal to longitudinal axis of the toothbrush is the longest, and the length of hair bundles 12A, 12C is shorter as they go outside. The diameter of the bristles 11A, 11B, 11C at 1 mm from the tip of the tapered tip part 16 is 0.025 to 0.15 mm.
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