Cavities, also known as caries, are a common dental problem caused by bacteria that produce acid and erode your teeth. Cavities are often hard to detect with the naked eye, but if left untreated, they can reach the nerve of a tooth and lead to a toothache.
Cavities can only be diagnosed through an exam, and are usually treated with cavity fillings. Modern fillings are usually made to match your tooth color, and make the restoration almost invisible.