| 摘要 |
An object is to provide an electric toothbrush superior in plaque removal, producible at low costs, and adapted to be easily utilized even by a patient with gingivitis. In an electric toothbrush (10) making brushing possible by linearly reciprocating a hair-planted section (31), the product of the distance (mm) of travel of the hair bundle of the hair-planted section (31) and the frequency (times) of reciprocatory vibration per minute is set in th e range of 3000 - 9000. Further, the distance ((x) mm) of travel of the hair bundle of the hair-planted section (32) and the frequency ((y) times) of reciprocatory vibration per minute are set in a range which satisfies the following equation. Y = ax + b where a = -3000, 10000 <= b <= 12500, x > 0
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