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. Crest Whitening Emulsions work to gently whiten teeth, leaving you with a visibly radiant smile.