At what age do children change their teeth?

The replacement of premolars from primary teeth to permanent teeth is normally between 9 and 12 years old. Due to individual differences, some children will replace premolars around 8 or 13 years old. Children who grow first molars at 6 years old and second molars at 11 or 12 years old will not replace teeth. In addition, due to individual differences, the age of tooth replacement in some children may fluctuate slightly.