Periodontal mucosa mainly has supportive function, sensory function, nutritional function, formation function, so the periodontal mucosa is very important for oral health influence. 1. Supportive function: the main component of periodontal mucosa is fibrous tissue, the opposite end of the fibrous tissue is deep into the alveolar bone, and the other end is deep into the bone, which can fix the teeth in the alveolar fossa to play the function of mastication; and at the same time, it can buffer the impact of the external forces, so that the teeth remain fixed in a stable state. 2. Sensory function: the periodontal mucosa contains a large number of abundant nerves and peripheral receptors, which can sense the temperature and vibration, pain and other changes, so as to be able to regulate the bite force of the whole mouth. 3. Nutritional function: the periodontal mucosa is rich in blood flow, which not only provides a lot of nutrients for the periodontal membrane, but also provides nutrients for the alveolar bone and dentin. 4. Formative function: the periodontal membrane is a continuous reconstruction, the formation of the process, in which fibroblasts can continue to synthesize collagen, fibers and other important tissues. Periodontal mucosa in the oral cavity plays a very important role, therefore, the need for regular scaling, maintenance of periodontal health.