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What to do: See your dentist or endodontist to save the tooth with root canal treatment. Symptom: Constant and severe pain and pressure, swelling of gum and sensitivity to touch. Possible problem: A tooth may have become abscessed, causing an infection in the surrounding tissue and bone.
Signs and symptoms of a tooth abscess include: 1  Severe, persistent, throbbing toothache that can radiate to the jawbone, neck or ear.  Sensitivity to hot and cold temperatures.