People have two sets of teeth in their life, milk teeth and permanent teeth. The baby’s milk teeth come in about 6-10 months after birth, and generally all 20 milk teeth erupt by the age of 3.5 years. Compared to the permanent teeth, the milk teeth have a smaller number of teeth and a smaller chewing capacity. The permanent teeth that will erupt later grow in the jawbone below the milk teeth. As the child’s jawbone and face grow, the permanent teeth gradually grow, and the roots of the milk teeth become shorter and shorter, and are eventually lost and replaced by the permanent teeth. Generally, the baby teeth are gradually replaced by permanent teeth at the age of about 6 years. All baby teeth have to work in the oral cavity for about 6-10 years before they complete their historical mission and gradually leave the oral cavity. Generally babies start to add supplementary food at 4-6 months, milk is the main food within one week of age, after one week of age, three meals a day and fruit snacks are the main food, milk is the supplementary food, so if the milk teeth are not well protected, first of all, it will affect the normal feeding and nutrient absorption and utilization of the child, resulting in reduced digestive function and even nutritional disorders leading to slow growth and development. Secondly, healthy milk teeth is an important factor in laying the foundation for healthy permanent teeth, and it is difficult to keep permanent teeth healthy if milk teeth are not well protected. Some of the permanent teeth have poor enamel development caused by the root end lesion of the milk teeth. If the decay of the baby teeth is serious, the bacteria will infect the permanent tooth germ below through the bottom of the root and produce cystic changes, leading to abnormal eruption of permanent teeth or developmental lesions, and even the risk of serious infection of cellulitis. There is even a risk of serious infection from cellulitis. This is why dental protection starts with the baby teeth. In addition, if there is a problem with the baby’s milk teeth, the baby must endure unpleasant dental treatment, which may lead to a greater fear of dental check-ups later in life. Therefore, it is important to protect the baby teeth. Parents should help their children to develop the habit of brushing and help with check-ups, with the help of parents to brush their teeth every night before bedtime, and also with mouth rinsing and flossing, as well as regular visits to the dentist for early detection and treatment. It is best to take your baby for his first dental checkup when he turns 1 year old (or earlier), as recommended by the American Dental Association. Of course, if your baby’s teeth are kept clean every day, then you can wait until age 3, when all of your baby’s baby teeth have successfully completed their growth, before visiting the dentist. Reminder: To prepare your baby psychologically, mom can play “role-play” with your baby first, she can be the doctor pretending to check your baby’s teeth, and then the baby can play the doctor again.