DHE and DMF.
D002648:Child; D002675:Child, Preschool; D004245:DMF Index; D003731:Dental Caries / Q000266:history / Q000517:prevention & control*; D006267:Health Education, Dental; D049673:History, 20th Century; D006801:Humans; D008131:London; D009909:Oral Health; D009910:Oral Hygiene