Brushing your teeth only once a day is not good enough, you need to brush your teeth at least twice a day, once in the morning when you wake up and once at night before going to bed. Usually the purpose of brushing is to remove food debris and bacteria in the mouth, so as to reduce the occurrence of oral diseases and promote the health of teeth. If you don’t have the habit of brushing your teeth for a long time, or if you don’t brush your teeth often enough, it is easy for food residues to remain in the gap between your teeth, and the bacteria in your mouth will ferment the food residues and produce some acid, which will slowly corrode your teeth and create cavities. In addition, it may also cause bad breath, bleeding gums, gum inflammation and other problems, leading to further deterioration of oral hygiene. Brushing in the morning after waking up can remove the bacteria and their metabolites remaining in the mouth at night, to achieve the purpose of oral hygiene. At night Brushing before going to bed can effectively remove the food debris in the teeth, to avoid sleeping food debris in the role of bacteria in the fermentation of acid production, damage to the health of the teeth. So you need to brush your teeth twice a day. In normal life, you can use dental floss to clean the neighboring surfaces of the teeth.