presents the oral hygiene indicators with different grouping factors. Overall, CI, PI, and GI of the total population were 0.58 ± 0.61, 1.45 ± 0.57, and 1.54 ± 0.64, respectively, with no significant difference across gender (P > 0.05). The 12-16 year age group had significantly higher CI, GI, and PI scores than younger age groups (P < 0.01). Subjects with severe mental retardation had significantly higher PI (P < 0.01) and GI (P < 0.05) scores than those in mild and moderate retardation groups; however, no significant differences regarding CI were detected.