Every natural tooth must be given a chance to survive as long as possible. Teeth which are periodontally diseased with severe bone loss, vertical root fracture, therapeutic mishaps, decay, resorption, around one root may well be retained by removal of diseased root by hemisection. This article describes a procedure of hemisection in mandibular molar with periodontally compromised distal root and its subsequent prosthetic restoration, which yielded a satisfactory result.