Kencana, I. G. S.; Budi Artawa, I. M.; Kumala Ratih, I. A. D.; Raiyanti, I. G. A. A. EFFECTIVENESS OF EXTENSION WITH DENTAL HEALTH EDUCATION VIDEO MEDIA ON ORAL HYGIENE AND SKILL CLEANING LEVELS IN DENTAL TUNAGRAHITA STUDENTS IN SLB BALI PROVINCE. JKG 2020, 7, 27-35.