Root canal treatment is a branch of dentistry that deals with detecting, treating and curing diseases of the tooth pulp, a soft tissue inside the teeth. 

Root canal treatment is carried out when the blood or nerve supply to the tooth becomes infected due to decay or injury. In the early stages, you may not feel any pain. In some cases, the tooth may become darker in colour, which can mean that the nerve to the tooth has died or is about to die. In this condition, the patient will need root canal treatment.