Choose a well-designed toothbrush that is easy to rotate in the mouth, removes to all parts of the teeth, and conforms to the shape of the dental arch and the size of the teeth. Generally choose a nylon wire toothbrush with flexible, smooth and easy to clean bristles or balled bristles. Adhering to the correct brushing method can remove plaque and massage the gums at the same time. Generally, brush your teeth twice a day, but for people with gum or periodontal disease, you should emphasize brushing your teeth in the morning and evening, and once more after lunch, for 5 minutes each time. The correct method of brushing is the short horizontal brushing method and the vertical rotation method. Short horizontal brushing method (also known as horizontal chattering method): People are used to the horizontal brushing method is a long pulling action, this horizontal brushing method can bring damage to the periodontium if coupled with a stiff bristled toothbrush (bristles damage the gum margin causing gum recession, wedge-shaped defects in the root and neck, etc.). The short horizontal brushing method with a short quivering horizontal brushing motion is the most effective in cleaning plaque. Place the tip of the bristles at an angle of 45° with the teeth and gingival surface and press lightly, the tip of the bristles partially enter the gingival sulcus and partially outside the sulcus, then make a backward and forward quivering 6-8 times, the movement of the bristles is only 1mm when quivering. when brushing the lingual and palatal surfaces of the upper and lower front teeth, if the dental arch is narrow, the head of the toothbrush can be erected for short horizontal brushing quivering. At the same time, it should also be pulled and brushed the occlusal surface of the posterior teeth to clean the sulcus point gap of the dentition. Vertical rotation method: It can effectively remove plaque and soft scale, and can stimulate gingival keratinization and maintain normal gingival shape. The action of brushing the labial and buccal surfaces and the lingual and palatal surfaces of the posterior teeth is to put the bristles parallel to the long axis of the teeth, stick to the tooth surface, point the bristles to the gingival margin, twist the toothbrush with pressure so that the bristles are at an angle of 45° to the long axis, and turn the toothbrush, i.e. brush the upper teeth with the bristles along the gap from the top downwards, and brush the lower teeth from the bottom upwards. Note that the action is slightly slower, with a little tremor, and the same part should be repeated 5 to 6 times. Brush the lingual and palatal surfaces of the anterior teeth with the same rotation action as above. For those with narrow dental arches, brush the toothbrush vertically, press part of the hair bundle on the gums, and pull the brush along the gap to the crown side, while pulling and brushing the occlusal surfaces of the posterior teeth.