tooth

The Simple English Wikipedia has an article on:

Tooth

Pronunciation

• IPA ^(key): /tuːθ/

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Noun

Singular tooth

Plural teeth

1. (countable) A tooth is a hard, white thing in your mouth. You use your teeth to chew food.
2. (countable) A tooth is a sharp point sticking out of something and forms a row of sharp objects for cutting.
3. (countable) A tooth is a rounded point on a gear that is used to transmit or receive force and motion to other gears.

• 
  A tooth
• 
  A tooth (in a row of teeth) on a hand saw
• 
  These gears have many teeth

Parts of the head (edit)

hair - scalp - forehead - ears - eyes - eyebrows - eyelashes - eyelids - nose - cheek - mouth - lips - teeth - gums - roof (palate) - tongue - jaw - chin