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front tooth; foretooth; incisor
転んで前歯を一本折ってしまった。
I fell and chipped a front tooth.
前歯の矯正に一年かかると言われた。
I was told braces on my front teeth would take a year.
子どもの前歯が抜けて大人の歯が生えてきた。
The child's baby front tooth fell out and an adult tooth grew in.