Oral hygiene human 12 male 10 Humans 9 female 9 Female 8 Male 8 mouth hygiene 8 controlled study 5 statistics and numerical data 5 Child 4 Dental Plaque 4 Dental plaque 4 Oral Hygiene 4 Toothbrushing 4 child 4 tooth brushing 4 tooth plaque 4 Adolescent 3 Dental Plaque Index 3 Gingivitis 3 Periodontal Index 3 adolescent 3 adult 3 gingiva disease 3 periodontal index 3 plaque index 3 procedures 3 psychology 3 Article 2