The secret to a hassle free snow white smile snow white dual foam system is part of a daily whitening routine to be used when brushing teeth in the morning easy two step system whitens top and bottom teeth at the same time apply using any toothbrush the two step dual whitening foam system is a fast and convenient way to maintain your teeths whiteness and keep them clean everyday the cleaning foam helps remove enamel surface stains from teeth using the foaming detergent