Crest 3D White Professional Effects Whitestrips provide professional level whitening results that last up to 12 months. Featuring Advanced Seal technology, these no-slip Whitestrips allow you to talk, drink water and go about your day while you whiten with no sticky mess. Use for 30 minutes, once a day for a stand out smile. Plus, you'll start seeing results after just 3 days.; Professional level whitening results that last up to 12 months.; Advanced Seal technology allows you to talk, drink water and go about your day while you whiten and the Whitestrips won't slip; Start seeing a whiter smile after just 3 days; Enamel safe. Same whitening ingredient dentists use; Give yourself a smile makeover with professional level whitening results at home; Easy application. Safe and easy to use.