If the pulp inside your tooth becomes diseased or injured, then a root canal therapy may be the best option to save the tooth from extraction. Root canal therapy is normally done after the progress of an inflammation on the root of your tooth. The root canal therapy can be done in a single dental appointment, however, there are instances where it is much more beneficial to the success of your endodontic treatment to complete the treatment over two to three dental appointments. Once the treatment has been determined to be successful, a permanent crown will be placed to seal the tooth which allows you to use the tooth normally.