The Bachmann method of brushing is also recommended for adults because it effectively cleans the teeth and gingival sulcus and prevents plaque buildup. The Bartholomew brushing method mainly cleans the position between teeth and gums, removes plaque, stops the formation of calculus, and effectively prevents periodontal disease. First, brush the outer side of the upper and lower row of teeth, tilt the toothbrush 45° toward the root, place it in the position of the gum edge, press it lightly and let the bristles enter the gum sulcus; move the toothbrush back and forth in a group of 2-3 teeth, chattering at least 10 times, then move to the next group of 2-3 teeth; second, then brush the inner side of the teeth, repeat the above action; brush the lingual and palatal side of the incisors, place the toothbrush vertically and use moderate When brushing the lingual and palatal sides of the incisors, the toothbrush should be placed vertically with moderate force from the gums to the crown, pointing and entering the gingival sulcus; 3. It is recommended to use a toothbrush with slim bristles to help clean the teeth and reduce the damage to the gums caused by improper brushing. The size of the toothbrush head is appropriate, about 2 cm long and 1 cm wide is sufficient for adults. Change the toothbrush every 3-6 months to prevent the growth of mold and bacteria on the toothbrush.