- Subjects with a complaint of dry mouth as assessed by a response of 40mm or greater on item "Rate the dryness of your mouth" of the Dry Mouth Visual Analogue Scale (VAS) questions. (The VAS limits will be 0 representing normal [i.e. no dry mouth symptoms] and 100 representing "the worst imaginable" dry mouth symptoms). This score should also be met before the 1st product application, on P1 D1.