Periodontitis should be treated early because its prognosis is related to the severity of the lesion. Periodontitis treatment is divided into four stages: the first stage is the basic treatment stage, the purpose is to choose the conventional treatment of periodontal disease, remove or control clinical inflammation and bite pathogenic factors, including oral self-cleaning, extraction of poor prognosis and unfavorable restorative teeth, supragingival scaling, subgingival scraping to remove plaque, tartar, the choice of antibacterial drugs to control inflammation, etc.; the second stage is periodontal surgery and fixed loose teeth; the third stage is permanent The third stage is the permanent restorative treatment, usually 2-3 months after surgery; the fourth stage is the review treatment section, once every six months, including plaque control, hygiene education, and radiographic examination, in order to further develop the treatment plan. The key to the success of periodontal treatment is twofold: firstly, a thorough treatment plan and meticulous and exquisite treatment by the doctor; secondly, the patient’s adherence to good self plaque control. The latter is more important than the former, otherwise the doctor’s work will be half-hearted, and the disease will occur again.