| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that conventional toothbrushes have not been specifically manufactured for left-handers or right-handers, and therefore it is difficult to have toothbrush tips to exactly reach the whole surface of teeth. SOLUTION: This toothbrush includes an angled neck leaning to either left or right when seen from the front of the stem, achieving the easy brushing.
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