What it is: A maximum-strength serum that delivers professional-level teeth whitening with virtually no sensitivity while helping repair enamel. What it does: This whitening serum combines potassium nitrate to help block teeth sensitivity and hydroxyapatite to help repair the enamel while whitening. How to use: It's easy to use. Simply apply the serum by twisting the wand and painting each tooth.Pro tips: For maximum results, use with SNOW's LED mouthpiece (sold separately). Use daily for up to three weeks at a time or until your teeth-whitening goals are achieved. 0.05 oz. Paraben-free; phthalate-free; sulfate-free Made in the USA