Children usually start to change their teeth around the age of 6 weeks.
Tooth replacement is also known as the replacement of milk teeth by permanent teeth, the first permanent tooth erupts at about 6 years old, and the milk teeth are gradually replaced by permanent teeth at the age of 6 to 12 years old, in which the first premolar and the second premolar replace the first molar and the second molar, and this period is called the mixed dentition period, and the second permanent molar erupts at the age of 12 years old; the third permanent molar erupts at the age of 18 years old, and there are cases of lifelong molar teeth and molar teeth that don’t erupt.
If your child has abnormal tooth replacement, he or she may be deficient in protein, vitamins, trace elements, or have abnormal thyroid hormone metabolism, etc. You need to take your child to the hospital in time for further examination, to clarify the cause of the disease, and to follow the doctor’s instructions for treatment. In addition, abnormal tooth replacement can also lead to malocclusion, which requires orthodontic treatment at the end of tooth replacement.