Exactly what kind of toothbrush is more appropriate to choose? This should be considered from the following aspects: 1, the size of the toothbrush head: According to the American Dental Association, the length of the toothbrush head should be 2.5 ~ 3 cm, the width of 0.8 ~ 1 cm, there are 2 ~ 4, rows of bristles, each row of 5 ~ 12 bundles of bristles, the front end of the toothbrush head should be round and blunt shape. These provisions can be used for reference when people choose toothbrush. 2, the hardness of the bristles: generally can be divided into soft, neutral, hard three, usually use a neutral hardness of the toothbrush is more suitable. When buying a toothbrush, you can use your finger to press the bristles, such as fingers have a tingling sensation is too hard, not straight choice. Currently commercially available toothbrush bristles are mostly nylon bristles. Nylon bristles elasticity, uniformity and hardness are better than pig hair toothbrush, more conducive to oral health. 3, the angle of the brush head and brush handle: commercially available toothbrushes are linear and angle type. Straight type is more powerful when used, angled toothbrush is better for cleaning the back teeth, the angle of 17 degrees to 20 degrees is appropriate. 4, the top of the bristles: the top of each bristle should be rounded and blunt, can not have a sharp angle, the purchase can be used to touch the hand to judge. 5, special toothbrush: periodontal disease patients or older people, gum recession, dental space increased, in addition to the general toothbrush available, more should use interdental toothbrush, this toothbrush bristles have conical, long, etc., can choose to use. There is also a toothbrush with only two rows of bristles, which is used to massage the gums. The concave toothbrush with two outer rows of bristles longer than the middle two rows of bristles is specially designed for those who are undergoing orthodontic treatment. This toothbrush not only cleans the tooth surface, but also cleans the food residue on the aligner. For those who have difficulty moving their arms and legs (such as stroke patients), electric toothbrushes and light energy ion toothbrushes can be used. The correct way to use the toothbrush are: 1, each time after using the toothbrush to wash thoroughly, and will try to shake off the water, put the toothbrush head up in the mouthwash cup, or put it in a ventilated place with daylight, so that it is dry and sterilized. 2. If conditions permit, you can buy 2 or 3 toothbrushes at the same time and use them in rotation, so that the drying time of the toothbrush is extended. This is especially important for people who suffer from gingivitis and periodontitis. In addition, rotating the toothbrush can also maintain the elasticity of the bristles. 3. Old toothbrushes whose bristles have come apart or curled and lost their elasticity must be replaced in time, otherwise they are not good for teeth and gums. 4, children living in groups, toothbrushes should be concentrated once a week for thorough cleaning and disinfection. 5, toothbrushes should not be used together to prevent mutual transmission of diseases. In addition, it must be stressed that brushing is only one aspect of dental protection, more important than brushing is rinsing the mouth, must do to eat something in time to rinse the mouth, which is more conducive to oral hygiene than brushing, otherwise, only rely on a day or two of brushing can not fundamentally prevent dental disease.