The aim of endodontic therapy is to achieve a three-dimensional obturation of the root canal space which effectively removes the bacteria from the canals which have been infected by microorganisms and to avoid recontamination of the canals by proper cleaning and shaping protocols. The major reason for endodontic treatment failure is due to missed roots and canals. Mandibular molars are most common teeth that requires endodontic treatment and exhibit numerous variations in its internal anatomy; one among those is the presence of an extra root lingually known as Radix Entomolaris (RE). The presence of this extra root can lead to difficulties during endodontic treatment. The success of Endodontic treatment depends on having proper knowledge about these possible variations of anatomical and morphological characteristics of the teeth. This case report presents the successful detection and management of mandibular first molars with RE by proper clinical and radiographic examination.

Keywords: Radix Entomolaris (RE); Mandibular molars; Roots, Canals.