A good set of teeth is very important to protect during the period of tooth replacement in children, if not paid attention to directly affect the development, eruption, shape and function of teeth. First of all, the earliest eruption is the first permanent molar, on the child’s jaw facial growth has the role of positioning, fixed height, on the other teeth eruption, alignment or not have an impact, protect it can be a lifelong benefit. Secondly, during the tooth replacement period, we should pay attention to the correction of various bad habits of children. The period of tooth replacement is generally long 6-7 years, children are usually prone to nail biting, lip biting, tongue biting, tongue extension, licking and other bad habits, thus appearing uneven teeth, facial development asymmetry, etc. affect the aesthetics, thus leaving a lifelong regret in appearance. For individual stubborn, can not correct their own bad habits, should go to the dentist as soon as possible, wearing orthodontic appliances to help correct. Thirdly, pay attention to the prevention and treatment of molar caries. Therefore, we should pay attention to the timely treatment and prevention of milk molar caries, never think that milk teeth have to be replaced sooner or later, and there is no need to treat them when they are bad. The premature loss of milk teeth often leads to the lack of space for the eruption of permanent teeth and causes the irregularity of teeth. Finally, we should pay special attention to dental care, keep the oral cavity clean, and consult the doctor in time to avoid delaying the treatment of crowded teeth, twisted teeth, large gaps or caries. If the permanent teeth have erupted and the milk teeth still do not fall out, they should be extracted at the hospital. We should also educate children to brush their teeth carefully and eat more fiber-containing food, which can help teeth clean themselves and promote the growth and development of jaw bone and jaw face.