Four year effect of a dental birthday card program for three year old children.
D002170:Canada; D002675:Child, Preschool; D003731:Dental Caries / Q000517:prevention & control*; D003753:Dental Health Surveys; D005457:Fluoridation; D006267:Health Education, Dental; D006801:Humans; D012424:Rural Population; D014505:Urban Population