Periodontology mainly treats gum disease, periodontitis and other dental support tissue diseases, whose main clinical symptoms are red, swollen and bleeding gums, bad taste in the mouth, periodontal pus overflow, loose and lost teeth, etc. The clinical operations carried out by the Department of Periodontology are: 1. Periodontal basic treatment: conventional treatment methods are used to remove or control clinical inflammation and pathogenic factors. Including oral hygiene guidance, supragingival scaling (scaling), subgingival scaling and root surface leveling, occlusal adjustment, loose tooth fixation, etc. 2, periodontal surgery treatment: periodontitis developed to a more serious stage, the need for surgical treatment of periodontal soft and hard tissues to achieve better results. Including gingivectomy, various periodontal flap surgery, root amputation, tooth hemisection, bone grafting and guided periodontal tissue regeneration, etc. 3, periodontal restoration orthodontic treatment: patients with severe periodontal disease have tooth loss and displacement, etc. Under the condition that periodontal inflammation is controlled, we can fix the loose remaining teeth while restoring the missing teeth, and can also close the gap and establish a stable bite by orthodontic methods. 4, periodontal maintenance treatment: periodontal disease after treatment, should be regular professional maintenance to prevent recurrence, need to be lifelong adherence. This includes plaque control check, hygiene education, preventive cleaning, etc. 5.Aesthetic periodontal treatment: for problems such as uneven gingival height, exposed gingival smile, gingival recession, short clinical crown, tooth splitting to subgingival, etc., the aesthetic problem is solved and/or restoration is facilitated by periodontal shaping surgery. This includes crown lengthening, membrane gingival surgery, etc. The success of periodontal treatment depends not only on the doctor’s thorough treatment plan and superb treatment, but also on the patient’s adherence to good self-plaque control, and only through the joint efforts of both the doctor and the patient can long-term and stable results be achieved.