In a double-blind cross-over trial, a new synthetic saliva Sali-Synt was compared with placebo for the treatment of xerostomia in Sjögren's syndrome. Sali-Synt may soothe the pain in the mouth and reduces sleep disturbances better than placebo, but no statistically significant differences were found. Seven patients of 12 preferred Sali-Synt to placebo in helping xerostomia.
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Kaarela et al. (1982) studied this question.