article human 6 female 5 male 5 human experiment 4 adult 3 questionnaire 3 Age Factors 2 Child 2 Child, Preschool 2 Global Health 2 Humans 2 Program Evaluation 2 School Health Services 2 Toothbrushing 2 age 2 child 2 controlled study 2 education 2 global health 2 longitudinal study 2 major clinical study 2 mouth hygiene 2 night 2 preschool child 2 program evaluation 2 quantitative analysis 2 school child 2 school health service 2 statistics and numerical data 2