Brushing your teeth properly is the first step to maintaining healthy teeth and gums. You need to spend 2-3 minutes at a time to brush each tooth patiently and carefully. There are many ways to brush your teeth, here is an easy to grasp method: 1. When brushing the outer surface of the teeth, place the bristles at a 45° angle to the tooth surface, press lightly on the gum margin and brush the tooth surface up and down with moderate strength. Guangzhou General Hospital, Guangzhou Military District, Department of Stomatology, talk about B 2, use the same method to clean the inner side of the back teeth, brush the lower teeth from bottom to top and the upper teeth from top to bottom. Be sure to brush deep into the difficult areas at the ends of the back teeth. 3. When cleaning the inner side of the front teeth, put the toothbrush up and brush back and forth from top to bottom. 4. Finally, brush the occlusal surfaces of the back teeth once. You should brush your teeth every morning and evening, and it is very important to brush your teeth at night before going to bed, because the saliva secretion in the mouth almost stops when you go to sleep, and plaque is more likely to form, so it is very necessary to clean your mouth before going to bed. It is important to note that you must not brush your teeth horizontally! This is not only unclean, but also easy to brush the teeth out of the defect. A toothbrush with medium to soft bristles should be used and replaced every three months. You should not use the same toothpaste for a long time, you can change the brand and type of toothpaste from time to time.