Question

why do teeth ache when there is a hole in them

Answer 1

Because In that Hole Bacteria Is present also known as cavity it should be treated quickly otherwise the Bacteria present it makes it pain so..

Answer 2

Tooth decay is damage that occurs when germs (bacteria) in your mouth makeacids that eat away at a tooth. It can lead to a hole in the tooth, called a cavity . If not treated, tooth decay can cause pain, infection, and tooth loss. The center of the tooth is called the pulp.