the effect of education based on health belief model (hbm) in decreasing dental plaque index among first grade of middle- school girl students in hamadan sohrabivafa m [1] , moeini b [2] *, hazavehei smm [3] , soltanian ar [4] , rezaei l [5] received: 12 aug , 2013 accepted: 23 sep , 2013 abstract background & aims : oral-dental health behaviors education to students is an impor...