There are four types of teeth - incisors, canines, premolars, and molars. Each type has a different shape and function. Incisors cut food, canines tear food, premolars chew food, and molars grind food. Teeth are made of multiple layers including enamel, dentin, and pulp. It is important to take care of teeth by brushing, flossing, limiting sugar intake, and eating healthy foods in order to prevent cavities and damage.