A tooth is a hard, calcified structure found in the mouth. It is composed of enamel, dentin, and cementum and is used for chewing and biting food. Teeth are a vital part of our digestive process, as they grind food into smaller pieces to aid digestion. Teeth can be divided into four categories: incisors, canines, premolars, and molars. Each type of tooth serves a different purpose, from biting and tearing food, to crushing and grinding it. Teeth also help us to speak and pronounce certain sounds. Without teeth, our ability to digest food and speak properly would be significantly impaired.