Wisdom teeth, or third molars, are the last permanent teeth to appear (erupt) in the mouth. These teeth usually appear in your mid teens to early 20’s. Some people never develop wisdom teeth. For others, wisdom teeth erupt normally — just as their other molars did — and cause no problems.
Several people develop impacted wisdom teeth — teeth that don't have enough room to erupt into the mouth or develop normally. Impacted wisdom teeth may erupt only partially or not at all.