If the infection in children’s teeth is serious and the infected material has reached the pulp, pulpitis or even periapical inflammation of the milk teeth will also require root canal treatment for milk teeth. The main difference between root canal treatment and adult root canal treatment is the difference in the medication and root filling material used during root canal treatment. The main purpose of root canal treatment is to completely remove the infected material from the root canal and remove the source of infection so that the infection will not spread further to the periapical tissue. Pulpitis and periapical infection in children’s milk teeth should be treated in a timely manner: on the one hand, when pulpitis occurs in teeth, children may chew laterally or may not be able to chew food, which is not conducive to the absorption of nutrients and may cause changes in facial shape. On the other hand, pulpitis in the milk teeth may develop into periapical infection because the permanent tooth germ is developing underneath the milk teeth, and the long-term inflammatory environment of the permanent teeth is not conducive to the development of the permanent tooth germ.