tooth · noun C /tuːθ/Full view
tooth
A1 one of the hard white objects in the mouth, which are used for biting and chewing
Dictionary examples:

front/back teeth

a broken/missing tooth

false teeth

Brush/Clean your teeth thoroughly morning and night.

I had to have a tooth out.

Learner example:

It is important for me, because without it I can't clean my teeth. (Key English Test; A2; Portuguese)

grit your teeth
C2 to accept a difficult situation and deal with it in a determined way
Dictionary example:

I hate exercising, but I just grit my teeth and try to get through it.

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