Children generally have teeth between the ages of 6 and 12 and follow the principle of symmetry between the upper and lower rows of teeth, left and right, bottom first and then top. Although the time of tooth replacement varies from individual to individual, the general time and order of tooth replacement is as follows. I. The time and order of tooth replacement in children The time and order of tooth replacement in children is generally as follows: 1, incisors: 6-7 years old, 4 eruptions; 2, lateral incisors: 8-9 years old, 4 eruptions; 3, single cuspids: 11 years old, 4 eruptions; 4, first bicuspids: 10 years old, 4 eruptions; 5, second bicuspids: 12 years old, 4 eruptions; 6, first molars: 6 years old, 4 eruptions; 7, second molars. 8, the third molar: 18 years old after the third molar that is, wisdom teeth, some people do not have the third molar is also normal. Second, the reasons for children’s premature tooth replacement Generally, premature tooth replacement may be due to the child’s teeth have been traumatized and fallen off, such as tooth bump; second, oral diseases such as tooth inflammation, decay, etc.. It is suggested that parents should be alert to their children’s tooth replacement time and observe their teeth diligently. If you find that your child’s baby teeth fall out prematurely due to decay, trauma, periodontal disease, etc., you should consult a doctor early. How to take care of the child during tooth replacement The care measures for the child during tooth replacement are as follows: 1. pay attention to the caries of the baby teeth to avoid affecting the growth of permanent teeth; 2. pay attention to the eruption of permanent teeth to avoid affecting the permanent teeth before the baby teeth fall off; 3. maintain a balanced diet and increase the number of chewing; 4. correct the child’s bad habits such as licking teeth and biting fingers; 5. clean the teeth in the morning and evening and rinse the mouth after meals, etc. Fourth, the precautions during the child’s tooth replacement period In addition to care, the child needs to pay attention to the following aspects during the tooth replacement period: 1, pay close attention to the development of teeth, regular dental checkups; 2, urge children to clean their teeth every day to prevent caries; 3, ensure the supplement of calcium to avoid tooth loss; 4, pay attention to the protection of the sixth age teeth; 5, avoid bad habits such as side-chewing, mouth breathing.