Polident ProGuard & Retainer Clear & Fresh Tablets will help keep your removable oral appliance clean and crystal clear. This gentle, non-abrasive cleaner kills 99.99% of odor-causing germs and gently lifts stains and removes discoloration from most dental appliances. These tablets are suitable for use on orthodontic retainers, mouth guards, night guards, acrylic splints and sports guards.