child education female 11 human 11 male 10 article 9 Humans 8 human experiment 8 Child 7 major clinical study 6 Female 5 Male 5 controlled study 5 questionnaire 5 School Health Services 4 mouth hygiene 4 school child 4 school health service 4 Child, Preschool 3 Health Knowledge, Attitudes, Practice 3 Oral Health 3 adult 3 attitude to health 3 chi square test 3 health 3 longitudinal study 3 preschool child 3 procedures 3 randomized controlled trial 3 Adult 2