Use ACT Restoring Mouthwash to help prevent cavities and fight plaque for healthier teeth and gums. ACT Anticavity Mouthwash, Cool Splash Spearmint, freshens your breath and effectively kills germs that cause bad breath. The fluoride in this ACT Fluoride Mouthwash, 33.8 fl oz, is the main ingredient used to restore minerals to soft spots, strengthening tooth enamel and preventing acid erosion.