You may find new wisdom (in the form of extra back molar) teeth coming through at about age 16 to 25 years. The problem is that you might not have enough room in your mouth for these teeth to grow into the normal position, which may result in discomfort and your teeth to begin crowding.
While wisdom teeth grow:
For many, the only cure is to remove them, which may be carried out by either your dentist or a maxillofacial surgeon. This can be simple or complicated depending on the site and the tooth's proximity to the underlying nerve.

Digital x-ray image of an impacted wisdom tooth and indicates the possible site of future decay.
OPG image illustrating the devastation of impacted wisdom teeth.
This patient required four teeth to be extracted (2
x wisdom teeth and 2 x second molar teeth) due to impaction of wisdom teeth and
resulting extensive decay.
Photograph of a patient's mandibular (lower jaw) second molar, with severe decay
caused by an impacted wisdom tooth.
All four molars appeared similar clinically, and subsequently
all four molars were extracted.