Scaling is a subgingival scaling procedure, which is used to treat periodontitis by removing calculus, plaque, and other plaque. In the early stages of periodontitis, the gums become red and swollen, and as the disease progresses, the teeth become loose, the gums recede and even teeth are lost. Subgingival scraping is a way to treat periodontitis by using a scraper to scrape away the calculus and plaque from the periodontium, eliminating oral inflammation and achieving the purpose of treating periodontitis. Daily attention should be paid to oral cleaning, brushing teeth properly every morning and evening, paying attention to a balanced diet, appropriate exercise, enhance the body’s immunity, improve the periodontal disease resistance, regular dental examination, every six months can be scaling, to remove dental calculus.