Root canal treatment is performed on diseased teeth or teeth where decay has entered the pulp or “nerve” chamber. This is the blood supply or life of the tooth. Once the circulation is removed, it becomes a non-vital or dead tooth. If the blood supply is cut off from say a kidney, the kidney dies and if not removed can become gangrenous. The same thing happens to a tooth, it becomes a low grade type of gangrene. Bacteria studies clearly show this type of bacteria found in root canal teeth.