It is more appropriate to brush your teeth 2-3 times a day, once in the morning, once in the middle of the day and once in the evening, or once in the morning and once in the evening. Brushing in the morning should be after getting up and eating breakfast, can clean the surface of the teeth to keep it clean, smooth, to avoid the accumulation of food debris, to avoid bacterial adhesion; midday brushing purpose is to reduce the food residues in the mouth; evening brushing is before going to bed, the purpose is to remove the food residues in the mouth, as well as dental soft tartar, plaque, etc., as far as possible to minimize the propagation of bacteria during sleep. In addition to paying attention to the time and frequency of brushing, it is also critical to do it correctly. It is recommended to choose soft bristles, small head of the toothbrush, should be swept up and down the line Pasteur brushing method, moderate strength, clean oral hygiene at the same time, reduce the damage to the gums brushing.