Root canal treatment for incisors includes three major steps: root canal preparation, root canal disinfection and root canal filling. 1. Root canal preparation: A hole is made on the lingual side of the incisor, which is called pulp opening, to establish a straight channel between the outside world and the root canal, and then the infected pulp and dentin wall are cleaned out as much as possible by instruments. 2. Root canal disinfection: The walls of the root canal are rinsed and disinfected by various physical and chemical methods to kill any remaining bacteria as much as possible. 3 . Root canal filling: The cavity in the root canal is filled as much as possible by means of cold or hot dental cement, and then filled to close the cavity prepared in the first step. Root canal treatment is more complicated, very few lower anterior teeth exist 2 root canals, it is recommended to go to a regular hospital stomatology department.