The correct method of brushing teeth is described in the video by Gong Zhengwei of the General Department of Hangzhou Dental Hospital: 1. Brush the outer side of the upper and lower row of teeth first. 2. Then brush the inner sides of the teeth and repeat the above actions. 3. Brush the inner side of the incisors with the toothbrush in an upright position, using a moderate force from the gums to the crown. 4. Finally, brush the chewing surfaces by placing the toothbrush on the chewing surfaces and moving it back and forth.