Tooth

A tooth is one of the hard, white things in the mouth. Teeth (plural) are used to help the mastication process by chewing food. Chew means to break up and crush food so it can be swallowed (pushed down into the stomach).

Most vertebrates have teeth. Birds are the biggest group that do not. Many invertebrates have mouthparts which, to some extent, act like teeth. Different animals have different kinds of teeth because they eat different foods. Some animals use teeth as a weapon. Human adults usually have 32 teeth.^[1] Human children usually have 20 teeth.^[1]

1. ↑ ^{1.0 1.1} Tina Callison. "How many teeth do we have?". Colgate Oral Care Center. Archived from the original on 10 January 2016. Retrieved 10 January 2016.