Root canal sealing is the method used for root canal treatment and is not harmful under regular operation. However, if the operation is not done properly, the residual tissues are not removed completely, or the operation is not done properly, or the crown restoration is not done in time, apical periapical inflammation, endodontic inflammation, and tooth fracture may occur. 1. Periapical periodontitis: When root canal sealing is performed, the residual tissues are not cleaned up, which may repeatedly stimulate the apical tissues and easily cause periapical periodontitis, resulting in recurrent swelling and pain in the gums, and pus will flow. 2. Pulpitis: Root canal treatment sealing medicine hurt the pulp tissue, easy to cause secondary infection, resulting in inflammation of the pulp. The main manifestation is toothache, which affects normal life. 3. Tooth fracture: Root canal treatment may lead to loss of nutrient supply to the tooth after sealing, tooth hardness is reduced, it is easy to fracture the tooth when it is used improperly. It is recommended to observe regularly after root canal treatment, if there is any discomfort, such as abnormal sensation, toothache, red and swollen gums and other symptoms, it is recommended to consult a doctor in time.