Toothbrush head have size and shape, in general, the ordinary brush head because the brush head area is relatively large, can fully and tooth contact, more suitable for brushing the front incisors and other teeth in front and the occlusal surface of the back teeth, the reason why there is a super small brush head toothbrush, because the mouth back some teeth (such as wisdom teeth), the location is more hidden, not easy to brush, and small head toothbrush can be flexible rotation in the mouth, can brush to each The small head toothbrush can rotate flexibly in the mouth and can brush every tooth surface and crevice, especially the teeth at the back with a small brush head to clean better. Different ages, in fact, the choice of toothbrush is very delicate, the choice of children’s toothbrush in the family (especially young children) also has its special requirements, must not use the exact same toothbrush as adults. Preschoolers choose a small brush head, soft bristles, brush handle short small toothbrush; children older, choose a larger brush head children’s toothbrush, in order to attract children love to brush their teeth, often choose the child’s favorite cartoon shape. When choosing a toothbrush for the elderly in the family, we should pay attention to avoid too large and wide brush head, so as not to aggravate the age-related tooth wear and periodontal recession, the handle should be easy to hold in the hand; the elderly suffering from periodontal disease are also equipped with a small gap brush to match the gap between the teeth, it is a special toothbrush specifically used to clean the larger gap between the teeth. Regardless of the size of the brush head, the bristles of the toothbrush should be soft. Soft bristles are generally more flexible and better able to remove bacteria and food debris from hidden places such as between teeth and gums and in the gum sulcus, without damaging the gums.