Understand your teeth : Names, types , and how they function. A helpful guide for maintaining a healthy, confident smile. Learn about the four types of teeth in adult humans: incisors, canines, premolars, and molars. See anatomical diagrams, tooth numbering system, and tooth eruption chart. The types of teeth in humans play different roles such as cutting, shearing, grinding, crushing, and tearing of food. The types of teeth and their functions are essential for understanding how we chew food and break it down for digestion. Human teeth function to mechanically break down items of food by cutting and crushing them in preparation for swallowing and digesting. As such, they are considered part of the human digestive system. [1] Humans have four types of teeth : incisors, canines, premolars, and molars, which each have a specific function. The incisors cut the food, the canines tear the food and the molars and premolars crush the food. The roots of teeth are embedded in the maxilla (upper jaw) or the mandible (lower ...