Toothbrush is the main tool for people to maintain oral hygiene. Toothbrush varieties on the market, a lot of brands, in fact, choose what kind of toothbrush is more appropriate? This should be considered from the following aspects: 1, the size of the toothbrush head: According to the provisions of the American Dental Association, the length of the head of the toothbrush should be 2.5 ~ 3 centimeters, the width of 0.8 ~ 1 centimeter, there are 2 ~ 4 rows of bristles, each row of 5 ~ 12 bundles of bristles, the head of the toothbrush head should be rounded blunt shape. These provisions can be used for reference when people choose toothbrushes. 2, the hardness of the bristles: generally can be divided into soft, neutral, hard three, usually use neutral hardness of the toothbrush is more suitable. When you buy a toothbrush, you can press the bristles with your finger, if your finger has a tingling sensation, it means that it is too hard and should not be used. The bristles of toothbrushes on the market are mostly nylon bristles. The elasticity, uniformity and hardness of nylon bristles are better than pig hair toothbrushes, more conducive to oral health. 3, the angle of the brush head and brush handle: commercially available toothbrushes have linear and angular type two. Straight type is more powerful when used, angled toothbrush on the back teeth cleaning effect is better, 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, there can be no sharp angle, when purchasing can be used to touch the hand to judge. 5, special toothbrush: periodontal disease patients or older people, gum recession, increased interdental space, in addition to the general toothbrush can be used, should use interdental toothbrush, the bristles of this toothbrush has a conical, long and so on, you can choose to use. There is also a toothbrush with only two rows of bristles, which is used to massage the gums. Outer two rows of bristles than the middle of the two rows of bristles long concave-shaped toothbrush, is specially for orthodontic use, this toothbrush can not only brush the surface of the teeth, but also clean the food debris on the orthodontic appliances. For those who have difficulty moving their hands and feet (such as stroke patients), you can choose electric toothbrushes, light energy ionized toothbrushes and so on. Correct use of toothbrushes are: 1, after each use of the toothbrush should be thoroughly washed, and will try to shake off the water, the head of the toothbrush up in a mouthwash cup, or placed 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 to rotate, so that the drying time of the toothbrush to extend. This is especially important for people with gingivitis and periodontitis. In addition, rotating the use of toothbrushes can also maintain the elasticity of the bristles. 3, the bristles have been scattered or curled, lose elasticity of the old toothbrush, must be replaced in a timely manner, otherwise the teeth and gums are not favorable. 4, children living in groups, the toothbrush should be centralized once a week for a thorough cleaning and disinfection. 5, toothbrushes can not be used together, in order to prevent each other from infecting diseases.