When wisdom teeth are prevented from erupting into the mouth properly, they are referred to as impacted. Teeth that have not erupted are not necessarily impacted. It may be that it is still to early in someone dental development, and if time passes they might grow in properly. A dentist must examine a patients mouth and his or her x-rays to determine if the teeth are impacted or will not grow in properly. Impacted teeth may cause problems. Impacted teeth can result in infection, decay of adjacent teeth, gum disease or formation of a cyst or tumors from the follicle, which is the tissue which formed the crown of the tooth. Many dentist recommend removal of impacted wisdom teeth to prevent potential problems.