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Wisdom teeth or third molars, typically begin to develop in early adolescence, and may erupt into the mouth around the ages of 17 to 20.

Wisdom teeth are sometimes removed after the roots are somewhat developed, or at least three-fourths developed. This is usually in the adolescent years. Wisdom teeth that improperly start to erupt and become impacted, requiring them to be extracted, or pulled. Although they are like any other teeth, most people continue to have normal bites and well-functioning sets of teeth in their absence.

The following chart depicts the order in which most teeth erupt and shed.

teeth-chart

What about if a permanent teeth start erupting behind a baby tooth or primary tooth?

Yes, this could happen to your child and it is called TBT or “tooth behind a tooth”. It is very common and there is a solution. The primary tooth has to go. An extraction will allow the permanent tooth to advance and take the place of the primary tooth. In most cases when this is detected on time, there is no need for orthodontia treatment.