乳歯 にゅうし Meanings Noun baby tooth; milk tooth; first set of teeth Kanji 乳 milk. Read as ニュウ. 歯 tooth. Read as シ. Example sentences 息子の乳歯が永久歯に変わりました。All my son's adult teeth are in. 乳歯が抜けないうちに後ろから永久歯がはえてきました。His permanent tooth is coming in behind his baby tooth. 彼はまだ乳歯がある?Does he still have baby teeth? Jinuma: Japanese Dictionary · Word lists