Wisdom teeth are the 18-year molars, or third molars, erupting normally at the age of wisdom. in the majority of cases, the third molars do not have sufficient space in the mouth. For this reason, wisdom teeth are usually removed to either prevent problems. Or to treat existing problems. Like intermittent episodes of inflammation, decay, or the inability to maintain adjacent teeth. Wisdom teeth are most predictably removed prior to the age of 20. But prophylactic removal of these teeth is reasonable prior to the age of 30.