This document discusses dentition, the study of teeth structure and function. It describes the four main types of human teeth: incisors, canines, premolars, and molars. Incisors are chisel-shaped and used for cutting, while canines are sharp and used for tearing. Premolars and molars have bumps called cusps and are used for crushing and chewing food. The document also outlines the main parts of teeth: enamel, dentin, pulp cavity, and cementum.