The best time to brush your teeth is after 3-5 minutes after each meal. It is recommended to brush your teeth after every meal to clean the food debris on and between the teeth to prevent bacteria from staying on the teeth and producing acid, which can lead to tooth decay. Brush your teeth for at least 3 minutes each time, using the pasteurization method of brushing, which is done by brushing the toothbrush at a 45-degree angle toward the gums and using a gentle chattering method. When brushing, it is recommended to use a soft-bristled small-headed toothbrush to clean all surfaces of the teeth, and if necessary, it is also recommended to use dental floss interdental brushes, or dental flossers as an aid to clean the adjacent surfaces of the teeth. In order to make the teeth and periodontal health, we also need to go to the hospital for regular check-ups and scaling treatment regularly, and if the teeth are decayed, we need to treat the decay as soon as possible.