title: Audio-visual motivation and oral hygiene instruction. The effect upon gingival status and oral cleanliness in 15 years old children.
mesh_terms: D000293:Adolescent; D001296:Audiovisual Aids; D002986:Clinical Trials as Topic; D005069:Evaluation Studies as Topic; D006267:Health Education, Dental; D006801:Humans; D009042:Motivation; D009909:Oral Health; D010512:Periodontal Index