Benign cementoblastoma is an odontogenic tumour of mesenchymal origin. It usually presents as a distinct lesion with characteristic radiographic and histopathologic features. The tumour is attached to the roots of the teeth and commonly occurs in the posterior mandible. The case of a 19-year old female with a benign cementoblastoma is presented. The clinical histopathologic and therapeutic aspects of the tumour are described.