Is it normal for a 13-year-old to not have finished changing teeth yet?

Mar 21, 2025 Source: Cainiu Health
Disease description:

My son is 13 years old this year, and I noticed that some of his baby teeth have not yet been replaced. Many of his classmates have already completed their tooth replacement. Is this situation normal?

Doctor's answer (1)
Dr. Liu Chao

It is normal for a 13-year-old child to have not yet completed the replacement of baby teeth. Children's primary teeth usually begin to be gradually replaced by permanent teeth around age 6, and the entire tooth-replacement process generally lasts until about 12 to 14 years of age. Each child's growth and development rate is different, so the timing of tooth replacement may also vary. Some children might still have several primary teeth at age 13, which does not necessarily indicate a problem. The timing of tooth replacement is influenced by genetic factors, nutritional status, and individual differences. If the baby teeth are not loose or there are no other abnormal symptoms, there is generally no need for excessive concern.

To ensure dental health, it is recommended to regularly take children to see a dentist for check-ups. A dentist can assess the development of the teeth and provide professional advice. If primary teeth remain stubbornly in place for a long time or interfere with the normal eruption of permanent teeth, the dentist may recommend appropriate measures, such as extracting the retained baby teeth. Additionally, maintaining good oral hygiene habits, brushing teeth at least twice daily, using dental floss to clean between teeth, avoiding excessive consumption of sugary foods and beverages, and having a balanced diet rich in calcium and vitamin D are all beneficial to healthy dental development.