In general, wisdom teeth begin to erupt between the ages of 17-21. However, they do not always erupt, but can instead be trapped under the gum line. That’s because most people do not have enough room in their mouth to accommodate this third set of molars, which are the largest of all teeth. As a result, they either cause your other teeth to shift out of alignment or are unable to break through and become impacted. In such instances, the dentist will recommend extracting your wisdom teeth.