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Teeth are the hardest organs in the human body, which not only bear the functions of cutting and chewing, but also play the role of maintaining facial appearance and assisting pronunciation. Teeth can be divided into incisors, canines, premolars and molars. Each tooth consists of a crown exposed outside the alveolar bone, a root growing inside the alveolar bone and a neck between the crown and the root. The main component is dentin, and the outer bread is enamel (in the crown part) and cementum (in the root part). There is also a periodontal membrane composed of fibers outside the cementum to fix the teeth in the alveolar cavity. There is a dental pulp cavity in the center of the tooth, which is filled with dental pulp and rich in blood vessels and nerves.