Why is it that when a nerve is exposed in a tooth it is very painful?

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Why is it that when a nerve is exposed in a tooth it is very painful?

In: Biology

As with most biological things: survival.

Teeth have a special type of pain nerve than other pain nerves. Thicker nerves transmit signals faster and more clearly like cables for the PC/TV.

In caveman times, a tooth injury could lead to your death. Your body wants your utmost attention when dealing with protecting your teeth.