WebMD.com: What Are the Signs That Root Canal Therapy Is Needed?

Signs you may need root canal therapy include:

  1. Severe toothache pain upon chewing or application of pressure
  2. Prolonged sensitivity (pain) to hot or cold temperatures (after the heat or cold has been removed)
  3. Discoloration (darkening) of the tooth
  4. Swelling and tenderness in nearby gums
  5. A persistent or recurring pimple on the gums

Sometimes no symptoms are present.

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