Down's Syndrome Diagnose characterized by the whole chromosomal aneuploidy 15 to 52 years Absence of severe hearing loss could impair the comprehension about the dental treatment Absence of severe visual loss that could impair the comprehension about the dental treatment Presence of at least four teeth being one for hemiarch. Diagnose of gingivitis and periodontitis Absence of acute periodontal disease and necrotizing periodontal disease