The patient, 19 years old male, visited with complaints of trismus and consults for construction of denture. 4 years ago, he received ⁶⁰Coteletherapy of left laryngeal area for treatment of throat tumor. Clinical apperance showed rampant dental caries, multiple root rests, xerostomia, disturbance of mandibular growth and asymmetry of face. Roentgenographic examination disclosed deep cervical caries, destruction of alveolar crest, punched out bone destruction of mandible and maxilla.