Age Factors Child, Preschool 4 Humans 4 age 4 female 4 human male 4 preschool child Child 3 Female 3 Male 3 child 3 education 3 Global Health 2 Program Evaluation 2 School Health Services 2 Toothbrushing 2 article 2 attitude to health 2 global health 2 human experiment 2 longitudinal study 2 mouth hygiene 2 night 2 program evaluation 2 questionnaire 2 school child 2 school health service 2 statistics and numerical data 2 tooth brushing 2