The aim of the our study was to assess the efficacy of autogenous tooth root as block bone graft in reconstructing the vertical and horizontal dimensions at periodontally hopeless extraction sites both clinically and radiographically. Methods: A total of 13 patients having a tooth with periodontally hopeless prognosis indicated for extraction were included in the study. Following atraumatic extraction the tooth was processed to create a decoronated cementum free dentin block which was used to augment the extraction socket. Results: The augmentation of periodontally hopeless socket with tooth block autograft resulted in gain of clinical ridge width of 5.9mm radiographically, apico-coronal defect depth reduced upto 8.2 mm (p 0.001) and gain in ridge width of 5.8 mm post-operatively after 6 months (p 0.001). Conclusion: The present study demonstrated the effectiveness of using tooth root as a block graft for ridge augmentation in the periodontally hopeless extraction site making it suitable for implant placement in future.