The shape of the brush head is generally square and diamond. The square brush head can effectively clean every surface of teeth. The diamond-shaped brush head is more square and sharp at both ends, which makes it easier to go deep into the mouth for cleaning. Any toothbrush with a brush head can clean teeth, but the size of the brush head must take into account factors such as mouth size, mouth opening, personal habits and so on.
Try to use a small brush head, which can go deep into the mouth, ensure flexible rotation and clean the back teeth. But there is no uniform standard. Children should choose a toothbrush suitable for their age. The choice of bristles should be moderate or slightly soft. However, it should be noted that bristles that are too soft are easy to brush.
Extended data:
shopping guide
Size of toothbrush head: According to the regulations of American Dental Association, the length of toothbrush head should be 2.5 ~ 3 cm, the width should be 0.8 ~ 1 cm, there are 2 ~ 4 rows of bristles, each row has 5 ~ 12 bundles of bristles, and the front end of toothbrush head should be round and blunt. These regulations can be used for reference when people choose toothbrushes.
Hardness of bristles: generally divided into three types: soft hair, neutral hair and hard hair. Usually, a toothbrush with neutral hardness is more suitable. You can press the bristles with your fingers when you buy a toothbrush. If your fingers are numb, it means they are too hard and should not be used. The bristles of commercially available toothbrushes are mostly nylon bristles. The elasticity, uniformity and hardness of nylon bristles are better than those of pig hair toothbrush, which is more conducive to oral health care.
Bristle tip: the tip of each bristle should be round and blunt, and there should be no acute angle. You can touch it with your hands when you buy it.
References:
Baidu encyclopedia-toothbrush