Everyone brushes their teeth twice a day, once in the morning and once at night. Some people brush their teeth three times, but studies have shown that brushing three times has basically the same effect as brushing twice. However, it is important to brush your teeth effectively, choose a toothbrush with a small head and soft bristles, and choose the right brushing method. If it is a child, you can choose the circular method, and parents must supervise to help brush teeth, so as to ensure the health of teeth and avoid tooth decay. For adults, you can choose the Bachmann brushing method and vertical rotation method, and then use good floss to remove the plaque on the adjacent surface of the teeth, toothpicks and gap brushes are used to ensure the health of the whole mouth periodontally. If the periodontal condition is already very bad, you need to do periodontal subgingival scraping treatment, and to maintain periodontal health regularly, regular checkups, and usually ensure oral hygiene to have a good periodontal condition.