noun
The most common meaning: a tooth or teeth in humans and animals.
毎日、歯を磨く。
I brush my teeth every day.
甘いものを食べすぎて、歯が痛い。
I ate too many sweets and my tooth hurts.
noun
Extended use for tooth-like projections on tools, gears, or other objects.
この鋸は歯が細かい。
This saw has fine teeth.
櫛の歯が一本折れた。
One tooth of the comb broke.
noun
Refers to the wooden supports under a geta sandal; a specialized use.
下駄の歯がすり減ってきた。
The supports of my geta have worn down.
Outdated kanji form; not used in modern Japanese.
Native Japanese word. The kanji 歯 is a pictograph of teeth and has been used for this meaning since ancient times.