Purpose: To assess the irritation potential of an essential oil-containing mouthrinse (Listerine Antiseptic) in a population with objectively documented xerostomia (hyposalivation) using an exaggerated-exposure clinical model.Methods: Following a baseline oral soft tissue examination, 19 qualifying female subjects with a mean age of 61 years and a mean unstimulated baseline salivary flow of 0.06 mL/min were randomly assigned either the essential oil mouthrinse or a negative control rinse.