There are a few reasons why your wisdom teeth may need to be extracted. Most of these reasons revolve around preventing damage to your teeth, jaws, sinuses, gums, and to prevent cavities.
Erupted wisdom teeth can also cause alignment problems and overcrowding. When we needed wisdom teeth, our skulls used to be much larger and could accommodate the extra set of molars. However, in modern times our skulls have gotten smaller and cannot properly accommodate these extra teeth, meaning that our mouths can become overcrowded when wisdom teeth erupt.