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歯は

teeth

→ 歯
phrase Rare #28,782
teeth 歯 means “teeth,” and は marks it as the topic: “as for the teeth.” Depending on context, は can add contrast or emphasis.
JA: 歯は毎日きれいに磨いてください。
EN: Please brush your teeth clean every day.

彼の歯は煙草の吸いすぎで黄色くなっている。

His teeth have turned yellow from smoking too much.

ライオンの歯は鋭いからね。

Lions have sharp teeth, you know.

歯はきれいに磨きなさい。

Brush your teeth well.

歯は磨いたの？

Did you brush your teeth?

彼の歯は真珠のように白い。

His teeth are as white as pearls.

必ず、歯は磨きなさい。

Be sure to brush your teeth.