There is a sequence of tooth loss. 1. Generally, children’s tooth loss starts at the age of 6~7 years old, usually in the order from the center to the back, from the lower jaw to the upper jaw, with a certain regularity. Clinically, most children start to lose their mesial incisors at the age of 6~7 years old, lateral incisors at the age of 7~8 years old, bicuspids at the age of 10~12 years old, and finally the molars. 2. Of course, there are also a small number of children will appear certain changes, but the changes are not very large, will not cause problems to the overall development of teeth, such as during the period of milk teeth for a long time, no growth, etc., you need to go to the dentist in a timely manner to see the doctor, through professional treatment to promote the replacement and growth of teeth. During the period of tooth replacement, you should do a good job of cleaning your mouth and teeth, and avoid licking your teeth and new permanent teeth too often, otherwise it will affect the growth of your teeth.