With the development of stomatology, the classification of oral cavity becomes more and more detailed. Stomatology is divided into stomatology, stomatology, orthodontics, prosthodontics, dental implants, children's stomatology and general stomatology. Stomatology is divided into dental pulp, periodontal disease, mucosal disease and dental pulp. It is mainly a disease of the teeth themselves.

A tooth consists of three hard tissues and one soft tissue. Hard tissues include enamel, dentin and cementum. There are soft tissues in the hard tissues of teeth.

Dental endodontics is mainly used to treat dental caries, which occurs in the hard tissue of teeth and develops from the teeth to the deep, so dental endodontics should be removed for filling teeth.