There are numerous reasons why patients who have previously received root canal treatment may experience new symptoms. Possible causes include new decay allowing bacteria to enter your tooth; a less than ideal past root canal filling that does not provide an adequate seal; calcified root canals that were not cleaned adequately; a new crack line or fracture line allowing bacteria to enter the entire root canal system; etc. A detailed discussion is best held with the endodontist to discuss the possible causes of your failed root canal treatment and the solutions that are proposed to resolve the issues identified. The endodontist is trained in managing complex cases, and further discussion with the specialist will help you understand exactly what is involved in your particular case.
What is endodontic retreatment?
Endodontic retreatment is essentially a revision of the original root canal treatment with the goal of resolving the infection by identifying and treating the new causative problems for the second time.