C-shaped canal configuration is a complex anatomical variation most commonly in mandibular second molars. It is characterized by fused roots and a continuous or semicircular canal system with fins, webs, and interconnections that complicate cleaning, shaping, and obturation. The prevalence of C-shaped canals varies significantly among different populations, with higher incidence reported in Asian groups encountered and frequent bilateral occurrence when present unilaterally. Fan’s classification provides a standardized method to categorize C-shaped canal morphology. Successful management requires modification of conventional endodontic techniques and the use of thermoplastic obturation methods to achieve three-dimensional sealing. This case report describes the nonsurgical management of bilateral continuous C-shaped canals (Fan’s C1 configuration) in mandibular second molars of a 24-year-old male patient using controlled rotary instrumentation up to size 25/.06 followed by single cone obturation technique.