Eli5 nerves in teeth

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WHY do we have to have nerves in our teeth what purpose does it even serve??

In: 10

We have nerves in our teeth so;

1) We know when to stop biting (pressure), and

2) When we should intervene to pull out decaying teeth (pain).

Partly they’re leftover from when your teeth were growing, and partly it helps you know if something is wrong with your tooth.

One thing I didn’t see mentioned: the nerves in your mouth/teeth play a big role in your ability to form words and speak.