Manufacturer Hismile. Using traditional Japanese gunk removal techniques to clean your mouth. Freshen Breath and Rinse Away Gunk: Brushing and flossing can be known to only reach 25% of the surfaces in your mouth, iD Stain Whitening Mouthwash picks up where your toothbrush leaves off targeting the soft tissue areas like your tongue, cheeks, and gumline for a cleaner feeling mouth.