During clinical practice, we often talk to patients about brushing their teeth, but they always hear, “Huh? Ah! I am surprised and confused. Do we really understand the daily task of “brushing”? Is it effective? Is it just for the sake of brushing? First of all, we must understand the purpose of brushing: 1) to take out the white soft tartar, food residue, and some plaque; 2) to massage the gums; 3) to prevent various diseases, especially tooth decay (commonly known as “worm teeth”) and periodontal disease. Brushing must remember the “3-3 system” 1, brush three times a day (at least twice an hour after meals); 2, brush three surfaces each time (lip, tongue and occlusal surface) but not just the front surface; 3, brush for three minutes (you can time the next brushing, you may not use 30 seconds). Brushing method: 1, physiological brushing method (commonly known as “vertical brushing method”) brush bristles and tooth surface contact, along the teeth to the gum brush (cleaning the surface of the teeth to stimulate blood circulation in the gum tissue); 2, horizontal chatter method (with your current horizontal brushing method difference: small amplitude; force gentle; different direction) brush bristles 45 degrees to the root, pressed between the gums and teeth. Soft bristles laid at the gum margin, reaching into the adjacent gap as far as possible, gentle pressure, avoiding short distance before and after the horizontal trembling several times (ten times) 2mm amplitude to avoid gravity pulling horizontal brush; 3, vertical trembling method; 4, BISS method Four zones: upper right upper left lower right lower left , three surfaces: lip and cheek surface palatal lingual surface occlusal surface , in order , no omission.