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tooth; teeth
tooth (of a comb, saw, etc.); cog
support (of a geta)
毎晩寝る前に歯を磨くよ。
I brush my teeth every night before bed.
櫛の歯が一本折れた。
One tooth of the comb broke off.
下駄の歯がすり減ってしまった。
The supports of my geta have worn down.