Histopathological examination of the specimen showed it to be a chronic infected dentigerous cyst. Maxillofacial surgeon Dr. S.M. Balaji surgically removed the entire cystic lesion along with the lining with affected tooth in toto. And the secondary mandibular defect was reconstructed simultaneously using costochondral rib graft. Following surgery the wound healed well and the patient was happy to be cured of his ailment.