Symptoms of periodontitis, such as gingival swelling and bleeding, can be controlled by periodontal scaling to improve the symptoms of gingival swelling and bleeding. Some severe periodontitis, teeth loose and fall off. Symptoms of periodontitis include gingival inflammation, periodontal pocket formation and alveolar bone absorption. If these are not well controlled, the teeth will loosen later. The treatment of periodontitis is mainly basic treatment, which is generally divided into plaque control, supragingival scaling and subgingival scaling. The control of dental plaque is mainly through brushing teeth to control dental plaque. To master the correct method of brushing teeth, form a good habit of brushing teeth, and use dental floss and toothbrush cleaning can control dental plaque well. Supgingival scaling is to remove dental calculus and plaque around teeth by ultrasonic oscillation. Subgingival scaling is a manual method to remove dental calculus, dental plaque and some inflammatory granulation tissue from the root below the gum. After subgingival curettage and subgingival curettage, local irrigation should be carried out, 3% hydrogen peroxide and physiological saline should be used alternately, and then iodine glycerin should be used to reduce inflammation locally, and then gargle should be used to consolidate the curative effect, maintain the oral flora environment and maintain oral hygiene, so as to control periodontitis and stop its development.