Wisdom teeth are the last teeth to erupt within the mouth. When they align properly and the gum tissue is healthy, wisdom teeth do not have to be removed, unfortunately, this does not generally happen.
Wisdom teeth are extracted to prevent a problem that has occurred or to prevent a problem that may arise in the future. Your jaw may not be large enough for the wisdom teeth to come through the skin, or they may be impacted and unable to break through the gums.
Food and germs can get caught under the partially erupted wisdom tooth, which can result in your gums becoming red, swollen and painful. Infections, damage to other teeth and bone or possible cysts can develop as a result of impacted teeth.

Risk
Poorly positioned impacted teeth can cause many problems. When they are partially erupted, the opening around the tooth allows bacteria to grow and will eventually cause an infection. The result: swelling, stiffness, pain and illness. The pressure from the erupting wisdom tooth may move other teeth and disrupt the orthodontic or natural alignment of teeth. The most serious problem occurs when tumors or cysts form around the impacted wisdom tooth, resulting in the destruction of the Jawbone and healthy teeth. Removal of the offending impacted tooth or teeth usually resolves these problems. Early removal is recommended to avoid such future problems and to decrease the surgical risk involved with the procedure.