We encountered a patient with Paget's disease. The patient was a 35-year-old-female. She visited our clinic, complaing about masticatory dysfunction. Examination revealed cranial bone outgrowth, alopecia, amenorrhea, mobile and malposed teeth, and alveolar expansion of the maxillae and mandibule. Radiographic observation of the skull and facial bones revealed a typical ground grass appearance, periapical cementum hyperplasia of the teeth. Histologic findings showed a mosaic architecture characteristic of Paget's disease.