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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.
An abscess is a pus-filled pocket that forms at the end of a toothâs root. In addition to an abscess, an infection in the root canal of a tooth can cause: 1  Swelling that may spread to other areas of the face, neck, or head. 2  Bone loss around the tip of the root.  Drainage problems extending outward from the root.