Possible problem: If this discomfort lasts only moments, sensitivity to hot and cold foods generally does not signal a serious problem. The sensitivity may be caused by a small decay, a loose filling or by minimal gum recession that exposes small areas of the root surface.

What to do: Try using toothpastes made for sensitive teeth. Brush up and down with a soft brush; brushing sideways wears away exposed root surfaces. If this is unsuccessful, see your general dentist. If the sensitivity is coming from a decay you should see your general dentist.

Possible problem: Dental work may inflame the pulp inside the tooth causing temporary sensitivity.

What to do: Wait two to four weeks. If the pain persists or worsens, see your general dentist.

Possible problem: There are several possible causes of this type of pain: decay, a loose filling or crack in the tooth. There may also be damage to the pulp tissue inside the tooth.

What to do: See a dentist for evaluation. If the problem is pulp tissue damage, your dentist may send you to an endodontist. Endodontists are dentists who specialize in pulp-related procedures. Your endodontist will perform a procedure that cleans out the damaged pulp and fills and seals the remaining space. This procedure is commonly called a "root canal."

Possible problem: This probably means the pulp has been damaged by deep decay or physical trauma.

What to do: See your dentist or endodontist to save the tooth with root canal treatment.

Possible problem: A tooth may have become abscessed, causing an infection in the surrounding gingival tissue and bone.

What to do: See your endodontist for evaluation and treatment to relieve the pain and save the tooth.

Possible problem: The pain of a sinus headache is often felt in the face and teeth. Grinding of teeth, a condition known as bruxism, can also cause this type of ache.

What to do: For sinus headache, see your physician. For bruxism, consult your dentist. If pain is severe and chronic, see your endodontist for evaluation.