EverSmile WhiteFoam is the latest oral care breakthrough for cleaning and whitening teeth, Invisalign aligners, and clear retainers. Unlike tooth whitening gels, WhiteFoam does not alter the fit of retainers and aligners. WhiteFoam uses a patented formula which whitens and cleans using proprietary surfactants, solvents and hydrogen peroxide working gradually to whiten throughout use. WhiteFoam whitens and cleans with virtually no tooth or gum sensitivity and can be used as frequently as needed. Best of all there is NO SOAKING REQUIRED! Pack of 2 is a 60 day supply if used twice daily.