The next breakthrough in teeth whitening. Crest Whitening Emulsions Advanced Enamel White create a micro thin layer of active, yet gentle, peroxide droplets, that stay on teeth longer*. The HydroShield™ technology creates an enamel-safe hydrating barrier you can feel to gently whiten teeth. Crest Whitening Emulsions is enamel safe for daily use with no rinsing or brushing required. Use up to 4x per day. This convenient, pocket size tube with a built-in applicator is great for whitening your teeth throughout the day. Just apply on your teeth and go! For best results do not eat or drink for 30 minutes after applying. Crest Whitening Emulsions removes over 10 years of stains in just 14 treatments. *vs ARC pen whitening