Results: Sixty students were randomly assigned to intervention and control groups. Among the demographic variables, only maternal education was significantly different between the two groups (P=0.02). Educational intervention significantly improved the perceived susceptibility (P=0.006), perceived severity (P=0.007), perceived barriers (P=0.01), and use of dental floss (P=0.009) in the intervention group. However, the impact on perceived barriers, cues to action, and brushing performance were not found significant (P>0.05).