Chronic periodontitis is an infection that occurs commonly in the human oral cavity, formerly known as adult periodontitis or chronic adult periodontitis, and is the most common type of periodontitis, accounting for approximately 95% of periodontitis, caused by the extension of chronic gingivitis to deep periodontal tissues as a result of long-standing local irritation. The pathogenesis is currently recognized as the result of a combination of systemic and local factors, and is a combination of immune and microbial destruction of the body. Local irritants are mainly plaque, tartar, tooth morphology, food inclusions, poor restorations, dietary habits and other local factors that can aggravate plaque retention. When the number of disease-causing microorganisms increases and their virulence increases, or the immune defense ability of the body itself decreases, the bacteria in the plaque growing under the gingiva will multiply, such as Porphyromonas gingivalis, Actinobacillus fowleri, Fusobacterium fowleri, Spirochete, etc. These disease-causing bacteria increase their activity and act on periodontal tissues, leading to inflammation, causing the destruction of the collagen structure of periodontal tissues, resulting in This leads to the destruction of the collagen structure of the periodontal tissue, the movement of the bound epithelium toward the root of the tooth, which in turn causes the formation of periodontal pockets and the resorption of the alveolar bone, with the end result being the loosening and loss of teeth, and the progressive development of gingivitis into periodontitis, a destructive lesion of the periodontal tissue. Chronic periodontitis is a common base disease in the oral cavity, which eventually leads to loosening and loss of teeth and seriously affects our quality of life. First of all, you should pay attention to yourself, consciously maintain oral hygiene, develop good dietary and oral care habits, brush your teeth in the morning and evening, rinse your mouth after meals, and try to avoid smoking and other bad habits. Secondly, we should take care of our own body condition, such as controlling blood sugar. With periodontal disease timely medical treatment, after the initial cleaning and deep scraping, regular oral examination, I believe that can achieve more ideal results.