Female 3 Health Knowledge, Attitudes, Practice 3 Humans 3 Male 3 Oral Health article 3 attitude to health child 3 education 3 female 3 health 3 human 3 human experiment 3 major clinical study male 3 questionnaire 3 Child 2 School Health Services 2 analysis of variance 2 chi square test 2 controlled study 2 mouth hygiene 2 procedures 2 randomized controlled trial 2 school child 2 school health service 2 21-day programme 1 Adult 1 Age Factors 1 Child, Preschool 1