1. The first permanent molar began to erupt at the age of 6, replacing the deciduous molar.

At the age of 2.7-8, the upper central incisors of permanent teeth will replace the central incisors of deciduous teeth.

At the age of 3.8-9, the permanent upper incisors replaced the primary incisors.

At the age of 4.9- 12, the first and second deciduous molars were replaced by the first and second pair of canines.

5. At the age of10-12, canine teeth of primary teeth were replaced by canine teeth of permanent teeth.

6. 12- 13 years old, all deciduous teeth were replaced by permanent teeth.