title: Toothbrushing efficiency of first-grade children.
mesh_terms: D002648:Child; D002675:Child, Preschool; D003773:Dental Plaque / Q000473:pathology / Q000517:prevention & control; D004526:Efficiency; D005260:Female; D006801:Humans; D008297:Male; D014070:Tooth / Q000473:pathology; D014099:Toothbrushing