Root canal treatment removes the inflamed pulp (nerve) or infection from with the root canals to remove the cause or source of the problem.
The root canals are widened, cleaned with an antiseptic solution, usually dressed with an antiseptic paste for 1-2 weeks, and then permanently sealed. Usually the tooth is sealed with a covering restoration to give the tooth some protection. The root canals are sometimes very fine or occasionally calcified or blocked completely. It can be difficult to find and negotiate these fine canals and an operating microscope is of great help.
Any associated abscess usually does not need to be removed but heals by itself once the root canals have been properly cleaned.