How Do Cavities Work?
Genes are partially to blame for cavities. Families with "soft teeth" tend to wear away enamel more often.
from Brain Stuff
Key Facts In This Video
Teeth are made of three main parts: enamel, dentin, and the blood supply and nerve. (0:18)
Certain kinds of bacteria produce acid which eat through the enamel of teeth and create a cavity. (0:46)
When your cavity eats all the way down to your nerve, a root canal is required. (1:06)