Taurodontism is a morpho-anatomic variation in tooth anatomy that rarely affects mandibular premolars. Mandibular 2nd premolars are considered as enigma to the endodontist, because of their wide variation in root canal & morphology. Proper negotiation and treatment of such cases is very important, failure to do such may results in loos of tooth. Incidence of such morpho-anatomic variation including three separate roots along with taurodontism is a rare condition and very few cases have been reported in literature so far. The novel diagnostic aids like cone beam computed tomography (CBCT) facilitates diagnosis. Such tooth requires exceptional and diligent care in each segment of endodontic treatment. This article describes the successful management of the left mandibular second premolar with taurodontism and three separate roots diagnosed using CBCT.