Development of teeth
First, a child grows a set of temporary teeth, ‘baby teeth’. As the child grows, these are gradually replaced by permanent teeth. Between the ages of 7 and 12, children have both temporary and permanent teeth.
The developmental timeframe of teeth is personal and variations are normal. Permanent teeth start to grow in when the child is 5–6 years old, and the first teeth to grow in are the front teeth and molars. The temporary front teeth are replaced with permanent front teeth. At the same time, the first permanent molars will also grow in.
When the child is about 10 years old, the rest of the baby teeth will start to be replaced with permanent teeth. The permanent teeth have grown in by the time the child is about 13 years old. The wisdom teeth will usually grow in after the child is 18 years old. People generally have 28–32 individual permanent teeth, depending on whether the wisdom teeth grow in or not.
Read more about oral health of a school-aged children.