| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily and surely remove materials clinging to the surfaces of teeth, such as calculus, plaque, and tar. SOLUTION: This toothbrush has a number of brushes 2 and a drive means for driving the brushes 2. The drive means moves only some of the brushes 2 back and forth in the direction of their axis. Since the other brushes that do not move back and forth in the direction of their axis can surely be held pressed against the surfaces of teeth, the brushes that move back and forth in the direction of their axis can surely be put into action to remove materials clinging to the surfaces of teeth.</p> |
