Cavity. It is a bacterial infection of the tooth. Inflammation also plays a rode in dentin decay. Enamel decay cam be reversed though re-mineralization. Once the decay reaches the dentin it has to be surgically removed and restored with a filling, inlay, only or a crown depending how much healthy tooth is left.
A hole in the tooth. Cavities are holes in teeth created by the bacteria that live in your mouth attached to your teeth. Treatment involves removing the tooth structure that has been destroyed by the bacteria and then placing a filling or some other type of restoration to give you back a complete tooth form and function.
Decay. Decay. With or without tooth pain, decay needs to be treated or you will lose tooth.