Third molars. The last teeth to come into the mouth. Wisdom teeth are often impacted and need to be extracted.
The third molar teeth, the last in each quadrant.
The third set of molars, the last teeth to come in, usually erupt at age 18-25
Wisdom teeth are third molars that usually appear between the ages of 17 and 24 (although they may appear when older, younger, or may not appear at all). They are commonly extracted when they affect other teeth—this impaction is colloquially known as "coming in sideways." http://www.umanitoba.ca/outreach/wisdomtooth/wteeth.htm To Keep or Not to Keep: Wisdom Teeth, hosted on the University of Manitoba: School of Dental Hygiene website. Page accessed January 17, 2007.