The hazards of root canal treatment for children are: 1, the enamel of milk teeth is thin, the pulp cavity is wide, the root canal treatment will destroy the resistance of the tooth causing the tooth to fracture.2, the brittleness of the tooth after the root canal treatment is larger, it is easy to collapse when chewing hard objects, reducing the efficiency of chewing, and the large area missing will cause occlusal mismatch.3, the root canal treatment of milk teeth needs to be filled with root canal paste, and the paste will be resorbed in 3-6 months, leading to bacterial retrograde invasion of the internal body along the apical foramen causing swelling again.4, the young permanent teeth lose the nutrient supply of the root after root canal treatment, which will affect the development of the root of the permanent teeth causing early loss. Ретроградное вторжение в тело зуба по апикальному отверстию, повторное инфицирование, вызвавшее отек.4, молодые постоянные зубы после лечения корневых каналов лишаются снабжения пульпы питательными веществами, что повлияет на развитие корня зуба, вызвав раннюю потерю постоянных зубов.