Endodontic treatment is necessary when the pulp becomes inflamed or infected. The most common reasons for inflammation or infection are deep cavities (caries), repeated dental procedures, cracks or chips. Trauma can also cause inflammation and often shows up as discoloration of the tooth. If pulp inflammation or infection is left untreated, it can cause pain or lead to an abscess.
Indications for treatment include prolonged sensitivity to heat or cold, discoloration of the tooth, swelling or tenderness of the tooth or adjacent gums. Sometimes there are no symptoms.