["To determine the efficacy of 3 types of polymer-based saliva substitutes in reducing oral dryness in patients with Sjögren's syndrome (SS).", 'Subjective efficacy of 3 different saliva substitutes (determined by self-administered questionnaire) was evaluated in a double-blind, placebo-controlled trial in 43 patients with primary and secondary SS. High-viscosity versus low-viscosity xanthan gum-based saliva substitutes were also compared in 33 SS patients. Salivary flow rates (SFR) were determined to examine correlations between the SFR and the subjective efficacy of the saliva substitute.', 'Neither the saliva substitutes nor the placebo was truly effective. Preference for a particular saliva substitute over placebo was equally distributed among the 3 types of substitutes. The SFR of patients who preferred polyacrylic acid-based saliva substitutes was lower than that in patients who preferred the porcine mucin-based substitute (P < 0.05). Patients whose oral dryness was reduced by low-viscoelastic substitutes had a low stimulated SFR ( < 0.20 ml/minute; P < 0.05).'] Does treatment of xerostomia with polymer-based saliva substitute in patients with Sjögren 's syndrome?