Listerine Stay White, 500 ml, Mouthwashes and Mouth Sprays unisex, The Listerine Stay White mouthwash strengthens the effect of whitening toothpastes and restores your radiant smile. Characteristics: helps protect against tooth decay protection against plaque kills bacteria keeps gums healthy ensures fresh breath How to use: After cleaning the teeth, rinse the mouth with mouthwash for the time stated on the label then spit out.