The anatomical morphology of milk teeth is similar to that of permanent teeth, but has its own characteristics: 1. The crowns of milk teeth are smaller and have a whiter color due to low calcification; 2. The reduction at the cervical margin is significant, so the cervical crest of the crown is prominent and the root is long and narrow; 3. The crowns of milk anterior teeth are proportionally wider than the crowns of permanent anterior teeth, and the crowns appear short and wide with wide crowns and narrow roots; 4. The crowns of milk molars have a significant cervical reduction and The cervical ridge is prominent. The root column is short and the root bifurcation is large; 5. The pulp cavity of the milk teeth is wider than that of the permanent teeth, and the pulp is rich in blood flow. However, because the apical foramen is also wider, the pulp infection can easily infect the periapical tissue through the apical foramen and affect the development and normal eruption of the permanent tooth germ. In addition to the basic function of chewing, they also play an important role in guiding the development of jawbone and permanent teeth and establishing the correct occlusal relationship; 2. Therefore, for the healthy growth of young children, we should pay attention to the protection and development of milk teeth, especially the protection of teeth during the period of tooth replacement, when milk teeth start to replace permanent teeth and milk teeth and permanent teeth coexist in the dental row at the critical moment: 1. Because the calcification of milk teeth is low, plus parents do not pay enough attention to oral hygiene of young children, often sleep with milk and sugar. Not to mention timely brushing and other protective measures, resulting in many toddlers missing their milk teeth prematurely. In fact, you should wrap your finger with clean gauze and gently massage your child’s dental bed and gums to promote the eruption of baby teeth from the very beginning. Once the first tooth has erupted, children should not be allowed to sleep with milk or sugar, and they should drink water after drinking milk to remove any sugar left in their mouths. It is best to use a toddler finger toothbrush to clean the baby’s teeth before bedtime, and guide the child to establish the correct concept of oral hygiene from an early age; 2. Premature loss of baby teeth will lead to underdevelopment of the jawbone and misalignment, heterotaxy, torsion, obstruction and other dental irregularities in the eruption of permanent teeth. Some parents take a laissez-faire attitude towards the full mouth caries of young children, and even often swelling and pain are not thoroughly treated, or seek for treatment to pull out the milk teeth without taking effective means to maintain the gap, resulting in the permanent tooth embryo (immature permanent tooth germ) is poorly developed, and even make the tooth embryo variant permanent tooth is missing. It seriously affects the bite, pronunciation and facial beauty. The early loss or decay of milk teeth is one of the main reasons for the irregular teeth of 70% of modern children; 3, children’s teething period is a critical moment for the healthy development of teeth, when the replacement of milk teeth and the protection of new permanent teeth is the focus. Professional dentists are needed to regularly check the children and take necessary measures according to the specific situation, do not blindly pull out the affected teeth to avoid unnecessary regrets. For the sake of your child’s health, please see a professional dentist for an oral examination every six months and every three months during the period of tooth replacement.