Root canal treatment is a procedure normally used when a tooth is compromised and has an infection or abscess which can often cause a bad taste in the mouth. Performing a root canal treatment removes the live root of the tooth and gives access to the tip of the root where abscesses normally form. This way, the abscess is treated and the tooth is normally saved. Treating a tooth this way is often the last chance to save it before extraction is considered.
Other reasons for needing root canal treatment include suffering a broken tooth or crown, deep decay, repeated dental procedures on the same tooth, severe cracks or chips, and also if the tooth is painful.