The national oral health epidemiological survey shows that caries (commonly known as worm teeth or tooth decay) and periodontal disease (including gingivitis and periodontitis) are the two most common diseases that endanger the oral health of our residents, which are more complicated to treat and cost more time and money. The change of color, shape and texture of the hard tissue of decayed teeth occurs gradually due to certain bacteria in the mouth, using the sugar in food to ferment and produce acid. In the early stage of caries, there is no pain and discomfort, and only when the doctor examines the tooth, he can find the black spot or white spot on the tooth surface; further development can form the cavity, and when it encounters acid, sweet, cold, hot stimulation, etc., it will feel pain and discomfort; when it is serious, the pain caused by cold and hot stimulation is very obvious; if it is not treated in time, finally the tooth body will be destroyed and become the residual root, residual crown, and even lead to the loss of teeth, causing serious chewing Difficulties, affecting physical health. Guo Qingquan, Department of Oral Medicine, Deyang Oral Hospital Periodontal diseases are various diseases that occur in the supporting tissues around the teeth (dental bone, alveolar bone, gums, periodontal membrane). First of all, the gums are red and swollen, and bleed easily when touched. If not treated in time, gum recession, alveolar bone resorption, periodontal pocket formation, tooth loosening and displacement, sometimes also cause periodontal pus overflow, oral odor, and finally tooth loss or extraction. Therefore, periodontal disease is the main cause of tooth loss in adults. The two major oral diseases mentioned above are mainly caused by dental plaque. Therefore, plaque removal through self oral health care and professional oral health care is the basis for maintaining oral health.