What causes tooth decay?

Germs in the mouth use the sugar in food to make acid. Over time, the acid can make a cavity in the tooth. Of course a healthy teeth is the best tooth. It is therefore important to prevent decay. Therefore sealants are so important.

Why back teeth decay so easily?

The chewing surfaces of the teeth are rough and uneven, because they have small pits and grooves. Food and germs can get stuck in the pits and grooves and stay there for long, because the bristles of a toothbrush can't brush them away. [pause]..