Crest whitening emulsions They are 40$ in stores

The all-new Crest Whitening Emulsions is a breakthrough formula featuring a thin layer of highly active peroxide droplets suspended in a hydrating base to whiten teeth with virtually no sensitivity. This means it applies in seconds and stays on teeth longer* to continue whitening long after you apply, with no need to rinse or brush off. This convenient, pocket size tube with a built-in applicator is great for whitening your teeth throughout the day.