“…The mean OHI-S Index score was 2.70 in substance abusers which is comparable to the other studies by Angelillo et al [12], Shapiro et al, [13], Silverstein [14], Rosenstein [15], and Zahrani [16] who reported mean OHI-S values of 1.71, 2.67, 2.61, 2.2, and 2.42, respectively. The mean OHI-S score was significantly higher in the study group than the control group ( P = 0.001) especially among the male groups between the age groups of <20, 20–29, and 30–39 years.…”