EverSmile WhiteFoam is the most effective Invisalign cleaner and retainer cleaner on the market. WhiteFoam is latest oral care product breakthrough for cleaning and whitening teeth, Invisalign aligners, and clear/hard plastic retainers. Unlike tooth whitening gels, EverSmile WhiteFoam does not alter the fit of retainers or aligners. EverSmile WhiteFoam uses a patented formula which whitens and cleans using hydrogen peroxide and proprietary surfactants working gradually to whiten throughout use in a convenient foam pump. EverSmile WhiteFoam whitens and cleans with virtually no tooth or gum sensitivity and can be used up to 4 times per day. Unlike Invisalign cleaning crystals or tablets, there is NO SOAKING REQUIRED! To use WhiteFoam, first remove your Invisalign aligners or clear retainers. Then pump 1/2 to one full pump of foam into both top and bottom aligners. Spread evenly with finger and place back into mouth. Spit out excess foam. You may optionally soak your aligners or retainers in an Invisalign case or retainer case for up to 5 minutes but this is not necessary. Pack of 1 is a 30 day supply if used twice daily.