Injury to the gums or teeth can be very painful. At times, you may have dental pain and not know why. For example, sudden pain may be caused by pieces of food that come in contact with a decayed area of the tooth. Food, heat or cold may create pressure near the nerve and cause pain. The nerve inside the tooth also may be exposed if you lose a filling or crown.
Some teeth are extracted because they are severely decayed; others may have advanced periodontal disease, or have broken in a way that cannot be repaired. Other teeth may need removal because they are poorly positioned in the mouth (such as impacted teeth), or in preparation for orthodontic treatment.