Many parents are often confused about which teeth will be changed in children and when, after reading the following introduction, I believe parents will have a preliminary understanding. The eruption and loss schedule of milk teeth (the time in the table is the average age, specific to each friend may vary greatly, for reference only) Tooth eruption time Loss time (usually the mandibular teeth will be earlier than the maxillary teeth) Milk incisors 6 – 8 months 6-7 years old Lu Jiaxuan, Department of Pediatric Dentistry, Affiliated Dental Hospital, Guanghua School of Stomatology, Sun Yat-sen University Milk lateral incisors 6 -10 months 7-8 years old Milk cuspids 16-20 months 11-12 years old The first molar is 12-16 months old and the second molar is 20-30 months old and 11-13 years old. There are two sets of teeth in a person’s life, and the first set of teeth is called the milk teeth, which is made up of 20 milk teeth. The first set of teeth begins to erupt at about 6 months of age, and the 20 milk teeth are completed by about 2.5 years of age. (Parents can count how many teeth their children have now, and if they have exactly 20 milk teeth, they will generally have new teeth to replace them, except in the case of missing teeth) From the age of 6-7 to 12-13 years, milk teeth are gradually lost and replaced by permanent teeth. The permanent teeth are the second set of teeth after the loss of the milk teeth, and if they are lost due to disease or accidental damage, there are no more teeth to replace them. In recent generations, the third molar has a tendency to degenerate, so the number of permanent teeth in general is between 28 and 32.