Periodontitis surgery generally has no risk, but individuals may have postoperative bleeding, postoperative infection and loose teeth. 1. If the patient has liver insufficiency or coagulation disorders, etc., the risk of bleeding during invasive operations such as periodontitis surgery is high and it is easy to stop the bleeding difficulties after the operation. 2. Periodontitis surgery has the risk of postoperative infection, but the risk is small and related to the patient’s underlying diseases such as coronary artery disease, diabetes, etc. If the patient has underlying diseases or is of advanced age, the risk of infection is higher. If the patient’s periodontitis is infectious and the infection is not controlled, the risk of postoperative infection is higher. 3. The likelihood of loose teeth after periodontitis surgery is related to the patient’s own root condition, the oral environment, as well as the surgeon’s operating techniques and treatment experience. Periodontitis surgery is recommended to be performed in a regular medical institution to reduce the possibility of complications.