| 摘要 |
A toothbrush wherein the intervals among adjacent filling hole edges and the total cross area of bristles put into each filling hole are controlled respectively to adequate levels so as to impart an excellent effect of removing plaque in sites frequently suffering from oral diseases and a high safety to soft tissues in the oral cavity and establish an outstanding appearance and favorable handling properties. In this toothbrush wherein a bristle bundle (1) formed by bundling plural bristles (2) is folded into two in a filling hole (4) on the filling face (5) of the head using a flat string (3), the interval (L) between the edge of a filling hole (4) and that of an arbitrary filling hole (4) closest thereto is regulated to 1.0 mm or below, at least in a part of the filling holes, and the total cross area of bristles (2) in the folded state per hole (4) is regulated to 1.0 mm2 or below.
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