Evaluation of the efficacy of a topical sialogogue spray containing malic acid 1% in elderly people with xerostomia: a double-blind, randomized clinical trial

Objective The aim of this study was to evaluate the clinical efficacy of a topical sialogogue spray containing 1% malic acid for elderly people affected by xerostomia. Material and methods This research took the form of a double‐blind, randomized clinical trial. Forty‐one individuals (mean age: 78.7 years) with xerostomia were divided into two groups: for the first ‘intervention group’ (21 subjects) a topical sialogogue spray (1% malic acid) was applied, while for the second ‘control group’ (20 subjects), a placebo spray was applied; for both groups, the sprays were applied on demand during 2 weeks. The Xerostomia Inventory (XI) was used to evaluate xerostomia levels before and after product/placebo application. Unstimulated and stimulated salivary flows rates, before and after spray application, were measured. Results XI scores decreased significantly (clinically meaningful) from 36.4 ± 7.3 points to 29.1 ± 7.1 (p