The data were checked for completeness and consistency daily and analyzed by using SPSS version 16.0. Descriptive statistics were computed for all variables. Differences between intervention and control groups responded to the knowledge and behavior questions by correct answers before and after intervention were calculated. The net effect of the intervention program was estimated by subtracting the percentage change pre- to post-intervention in control students from that for the intervention students. One-way repeated measure ANOVA with Bonferroni correction (post hoc test) was used to determine the retention of proper knowledge and behavior on oral health at three different points in time, at baseline, at 1 year after OHE, at 6 months after cessation of OHE, in students who received OHE at eight weekly intervals for 1 year. The level of statistical significance for all tests was set at 0.05.

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