Pulpotomy is also known as root canal treatment, which is divided into three steps: first, the decayed tissue on the surface of the tooth is removed, the pulp is opened and nerve inactivation medication is placed in the pulp cavity; second, after 7-10 days, the infected pulpal tissue is removed manually or mechanically as well as the infected hard tissues of the tooth in the wall of the root canal, so that the root canals are cleaned out and sealed with calcium hydroxide Thirdly, after 1-2 weeks, the root canals are filled with dental cement tips and root canal paste, and resin is used to restore the shape of the tooth. After routine root canal treatment, the patient is advised to crown the tooth or restore the fracture resistance of the tooth with an onlay restoration.