Generally speaking, the treatment of periodontitis can be divided into four stages: the first stage is the basic treatment stage, including oral self-cleaning, extraction of poor prognosis and unfavorable restorative teeth, supragingival scaling, subgingival scraping to remove plaque and tartar, selection of antibacterial drugs to control inflammation, and bite and jaw adjustment. The second stage is periodontal surgery and fixation of loosened teeth. The third stage is permanent restorative treatment and the fourth stage is review and retreatment stage, which is once every six months, including checking plaque control, hygiene education, and radiographic examination to further develop the treatment plan. Suggestions:1, master the correct method of brushing, 3 times a day, 3 minutes each time, 2, after meals, before bedtime rinse, keep the mouth clean, 3, for not easy to remove food debris, soft scale, plaque, floss, toothpicks, toothbrush cleaning