Dens invaginatus, a developmental anomaly caused by infolding of the dental papilla during early morphogenesis. Maxillary lateral incisors are the most commonly affected teeth. Presence of dens invaginatus in mandibular central incisor is very rare occurance. Unsual crown morphology was seen clinically in relation to right mandibular central incisor, Combination of endodontic and surgical treatment performed on mandibular right central incisor associated type III dens invaginatus. Nine month follow up was done.