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Three caries preventative regimens: oral hygiene; oral hygiene and topical fluoride; and oral hygiene, typical fluoride, and sucrose restriction were evaluated in patients with cancer given xerostomia-producing radiotherapy. The oral hygiene-fluoride gel combination was remarkably effective in protecting these high risk patients from caries, regardless of the cariogenicity of the diet.
Dreizen et al. (1977) studied this question.