As with any medical procedure, success cannot be guaranteed. However, root canal therapy has a very high degree of successful outcomes. Most endodontically treated teeth last as long as other natural teeth. In a few cases, endodontically treated tooth does not heal due to persisting or recurring inflammation or an infection, which may even occur years after successful initial treatment. This may happen if the tooth is not properly restored after initial treatment, or if it develops new cracks, or decay, or has loose, broken or missing fillings. Rarely, small canal spaces inside the tooth are not found and disinfected during initial treatment. Often in such cases, the tooth can be successfully treated and saved with a non-surgical or a surgical endodontic revision. We will discuss with you the chances of success before any endodontic procedure to help you make an informed decision. If initial root canal therapy does not result in healing, you still have options.