The criteria for considering a root canal treatment as success or failure many. Just because the clinical symptoms have subsided that doesn’t mean that the treatment is success, its just the severity of the disease has come down. The clinical, radiographic as well as the time factor after the treatment should be considered in the progress of the treatment. This article highlights the cause of success and failure of endodontics.

Keywords: Endodontics; Failure; LASERS; Success; Surgery.