Root Canal treatment (also known as endodontic treatment) is a series of procedures to save your tooth that has been damaged by decay, infection or injury which otherwise would require an extraction. The dentist will remove the inflamed or infected pulp then refill the canal with filling material and the pulp chamber is sealed to prevent any bacteria from re-entering the canal.
Root canal treatment is preferred over-extraction because real (natural) teeth will always function better than any unnatural teeth. They are much stronger and more efficient at chewing and biting than unnatural teeth. Even once root canal treatment has been carried out, the tooth will still survive because the surrounding tissue will nourish this tooth.