What causes dental decay?
Dental decay is an infectious process. It is caused by microscopic bacteria. They produce acid that eats away at the enamel and underlying dentin. Once they get far enough into the tooth, the only way to remove then is to prepare the area and place a restoration (filling). If the infection gets too far into the tooth, the nerve and infection can cause severe pain and a root canal or extraction will have to be performed. The bacteria feed on sugar, hence why mother's try to keep the candy and carbohydrates away from kids.