Mouth rinsing is recommended after meals, brushing in the morning and evening, and for some patients during orthodontic treatment or periodontal disease, brushing immediately after meals. Maintaining oral hygiene is the key to preventing oral related diseases, especially caries and periodontal disease. Under normal circumstances, it is recommended to use the Pasteur brushing method on weekdays, brushing in the morning and evening, rinsing after meals, and assisting in the use of dental floss; for patients with periodontal disease, the use of interdental brushes and flossers can be used as additional assistance. Pasteur brushing method is also known as the horizontal trembling method, usually choose a soft-bristled toothbrush, will be 45 ° angle to the gums, part of the gingival sulcus into the gingiva, part of the gums, and then a small horizontal trembling (4 ~ 5mm) after the downward whisking brush, moving, pay attention to can not be missed. When brushing the upper and lower front teeth, the toothbrush is placed vertically; the front and back of the joints are trembled; the back of the tongue should also be cleaned. It is recommended to brush 3~5min each time, once in the morning and once before going to bed. For some patients who are in the period of orthodontic treatment or periodontal disease, and are prone to food blockage, additional brushing can be done after meals. In addition, regular cleaning is recommended every 6~12 months.