Why brush your teeth often?

Brush your teeth correctly, brush your teeth for a short time, brush randomly, and there is no good cleaning of your teeth; pay attention to brushing your teeth in the morning and evening, brush your teeth for 2 to 3 minutes each time, brush each side of your teeth, use pasteurized brushing, and floss your teeth; you can use whitening toothpaste to brush your teeth; don't eat anything after brushing your teeth at night to prevent food residue on your teeth, which will also cause yellowing of your teeth; eat less things with pigments, smoke less, drink less coffee, and drink less tea. The above health science popularization knowledge is for reference only. The specific situation needs to be examined in a regular hospital and judged by a professional doctor.