Children usually change their teeth at the age of six. When they change their teeth normally, the germ of permanent teeth is at the root of deciduous teeth. With the growth and development of permanent teeth, they will gradually resist the root of deciduous teeth, resulting in loose absorption of deciduous teeth. Finally, the deciduous teeth fall off and grow permanent teeth.
If the position of the permanent tooth embryo is wrong, the deciduous teeth will not loosen and fall off. You can go to the stomatology department to pull out the stranded deciduous teeth, and the permanent teeth will grow in the normal position.