Pilot study to measure the change in dental health behaviour of children given oral hygiene instruction in groups of different sizes.
D002648:Child; D003773:Dental Plaque / Q000517:prevention & control; D005260:Female; D006267:Health Education, Dental; D006801:Humans; D008131:London; D008297:Male; D009910:Oral Hygiene / Q000523:psychology