Due to the degeneration of the human jaw system and the increasing refinement of food, the incidence of malocclusion has risen to about 80%, meaning that only two out of ten children now have teeth that do not require orthodontic treatment. In response to this situation, we give young parents a few suggestions that can reduce the chances of misalignment, or reduce the difficulty of orthodontic treatment later. 1, pay attention to the exercise of the jaw bone The alveolar bone, like the bones and muscles of other parts of the body, also needs exercise to grow wide and large to accommodate all the teeth. But now many parents and friends from the perspective of concern for children, always choose fine and soft food, large pieces of fruit but also cut into small pieces or juice and then give the child, which is actually harmful to the child. Dentist advice: children two and a half to 12 years old is a critical period of jaw bone development, should eat more need to chew or chewable food, large pieces of fruit can not be cut to promote jaw bone growth. 2, pay attention to oral habits Oral habits are the child’s involuntary lip biting, finger sucking, pen biting, nail biting, lateral chewing and other habits after the age of 3. Mouth breathing caused by rhinitis or tonsillitis should not be ignored, see children’s mouth breathing can not be taken lightly Different bad habits can cause different dental and jaw development malformations, but if the bad habits are broken early or after a simple orthodontic treatment. However, if the bad habits are broken early or after simple orthodontic treatment, the child’s teeth and jawbone can be restored to normal, but if the child is not seen in time, the deformity will be greatly aggravated and it is difficult to achieve satisfactory results. In addition to chewing food, another important role of milk teeth is to maintain the space needed for tooth replacement. If the milk teeth are not lost for a long time, we call it milk teeth retention, which will also cause the permanent teeth to be buried in the bone and cannot erupt or erupt from the side, and need to be extracted as soon as possible.