Children’s tooth decay caused by inflammation of the pulp, apical inflammation, root canal treatment is the only effective treatment method, if the root canal treatment is harmful, mainly in the following aspects: 1, accidental injury: for children to do root canal treatment, need to be very good with the situation, there may be a certain degree of pain, uncomfortable, but also may cause a certain degree of accidental injury, because the root canal treatment, need to carry out very small instrumentation, turbine grinding and so on, may cause accidental injury, accidental suction, accidental swallowing, so must do a good job of reassurance, so children can consider local anesthesia or even general anesthesia, so must be good. Need to carry out very small instrument operation, turbine grinding, etc., may cause accidental injury, accidental inhalation, accidental swallowing, so we must do a good job to appease the work of children who can not cooperate with the local anesthesia, or even general anesthesia to carry out the root canal treatment. 2, the tooth becomes brittle: to do root canal treatment, in addition to the pulp tissue, may cause the tooth to become brittle, easy to fracture and so on, in such a situation, to do root canal treatment to remove the pulp tissue is a very good idea. Root canal treatment to remove pulp tissue is a must. Pulp tissue is only removed for root canal treatment in cases of inflammation or inflammation of the root tip. The brittle effect on the tooth is not caused by the root canal treatment, but by the lesion of the root tip of the pulp, which causes the tooth to lose the nutrients from the pulp, resulting in brittleness. For this situation, after root canal treatment, you can do full crown to protect the teeth, to avoid tooth fracture.3, permanent tooth development: after root canal treatment, some parents will think that the pulp of the milk tooth is removed, whether the permanent tooth development, in fact, it is redundant to worry about, to do root canal treatment is to avoid the root tip of the milk tooth inflammation on the permanent tooth growth and development of the impact, if there is an impact, in fact, is the milk tooth lesion caused. If there is any effect, it is actually caused by the lesion of the milk tooth, so don’t worry, you still need to do root canal treatment when you should do it.