You and your dentist might decide that dental extraction is necessary for several reasons. One common cause is irreparable tooth damage due to severe decay. Also, periodontal disease, an infection that affects the gums and other supporting structures of the teeth, can loosen teeth to the point where saving them is impossible. Impacted teeth, such as wisdom teeth that haven't fully erupted, often require extraction. Overcrowding is another reason for tooth extraction, especially in preparation for orthodontic treatment. Lastly, trauma from accidents can sometimes necessitate tooth removal.