title: Letter: A field trial in preventive dentistry.
mesh_terms: D000293:Adolescent; D002648:Child; D003731:Dental Caries / Q000517:prevention & control*; D005460:Fluorides, Topical / Q000627:therapeutic use*; D006801:Humans; D009067:Mouthwashes / Q000627:therapeutic use; D012964:Sodium / Q000627:therapeutic use; D014100:Toothpastes / Q000627:therapeutic use
chemical_list: D005460:Fluorides, Topical; D009067:Mouthwashes; D014100:Toothpastes; D012964:Sodium