Dry mouth and medication induced xerostomia present incredible challenges for restorative success. Can we really expect our restorations to withstand an enemy so small it can't be seen with
the naked human eye, armed with secretions capable of disintegrating the hardest biological substance on earth? If you're salivating to break free of nylon bristles and string, you'll be 
pleasantly surprised the modern anti-caries arsenal has more than just the same ol' electronegativeanion in a new fun flavor.