The hazards of root canal treatment for children include:1. The enamel of milk teeth is thin and the pulp cavity is wide, so root canal treatment will destroy the resistance of the tooth and cause it to fracture.2. The brittleness of the tooth after root canal treatment is greater, so it is easy to collapse and break when chewing hard objects, which reduces the efficiency of chewing, and large areas of missing teeth will result in occlusal malocclusion.3. Root canal treatment of milk teeth needs to be filled with root canal paste, and the paste will be absorbed in 3-6 months, which will lead to the retrograde invasion of bacteria into the interior of the tooth along the apical foramen, causing swelling and infection again. The apical foramen retrograde invasion of the tooth body, the recurrence of infection caused by swelling. 4, young permanent teeth after root canal treatment lost the pulp of the nutrient supply, will affect the development of the root of the tooth caused by the early loss of permanent teeth.