歯し垢こう

noun

dental plaque

Refers specifically to the soft, sticky film of bacteria that forms on teeth. Common in dental and everyday health contexts.

• 歯し垢こうを放ほう置ちすると虫むし歯ばや歯し周しゅう病びょうの原げん因いんになります。

  If you leave dental plaque untreated, it can cause cavities and gum disease.

• 歯し垢こうは歯はブラシでしっかり落おとしましょう。

  Remove dental plaque thoroughly with a toothbrush.