Child, Preschool Humans 5 child 5 human 5 preschool child 5 education 4 female 4 male 4 Child 3 Female 3 Global Health 3 Male 3 School Health Services 3 Toothbrushing 3 global health 3 major clinical study 3 procedures 3 school health service 3 tooth brushing 3 Age Factors 2 Article 2 Infant 2 Oral Health 2 Program Evaluation 2 World Oral Health Day 2 age 2 article 2 controlled study 2 health 2 human experiment 2