Our first adult molars come in around the age of six or seven, the second molars come in around the age of 11 or 12 and the third molars, or wisdom teeth, anywhere from 16 years old to never, if there isn’t enough room and they get stuck in the gum and bone behind those second molars. When the tooth is stuck in the bone it’s impacted.
The wisdom tooth can be completely under the gum or it can come in halfway with a flap of gum covering it at the back. For most people, there is just not enough room at the back of the mouth for the wisdom teeth to come in to become useful and productive members of society. There is just no way that those wisdom teeth are going to come in properly.
For most people, it makes the best sense to have these teeth taken out. Wisdom teeth can start causing problems with infections, pain and discomfort in the teens or later.