Dry mouth, known medically as xerostomia, is a common effect of medicines with anticholinergic activity. Saliva does more than moisten food: it buffers acid, clears bacteria, and protects tooth enamel, so persistent dryness has dental consequences over time.
Anyone experiencing troublesome dryness can raise it with a pharmacist, dentist, or prescriber, who can look at the whole medication list for contributing products.