Your general dentist or endodontist will usually take X-rays to assess the condition of the tooth in question. The AAE notes that endodontists are specialized dental professionals who have received two to three additional years of education to diagnose and treat infections inside the tooth.
When you experience issues with a previously treated tooth, it may be necessary for an endodontist to reopen the tooth, explains the AAE. This process, called endodontic retreatment, allows the dentist to remove the original root canal filling material and reclean and reseal the canals. Following this procedure, they will place a temporary filling and you will receive your permanent restoration at a later appointment.
If you have a severe toothache or other old root canal infection symptoms, don't hesitate to book an appointment with your dentist. When these conditions are addressed early, your dental professional can successfully retreat teeth and maintain your smile.