| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-weight and small-sized electric toothbrush solving the problem that a conventional electric toothbrush cannot be held if it is not supported by hand.SOLUTION: An electric toothbrush 1 has achieved miniaturization and down-sizing of a motor 2 that generates vibration, a button battery 3, and a switch 4 so that the entire electric toothbrush can be supported by upper and lower teeth without holding it by hand. |
