Crest 3D White Gentle Routine Whitestrips provide more subtle whitening results, but are specially designed for teeth sensitive to whitening. This Gentle Routine is enamel safe, easy to use and whitens with the same ingredient dentists use. Use these Whitestrips once a day for just 5 minutes as part of your oral care regimen. It includes 28 Pouches 56 Total Strips; 5-minute, once-a-day whitening for teeth sensitive to whitening; A gentle routine for more subtle whitening; Enamel safe and easy application. Same whitening ingredient dentists use; The #1 dentist-recommended brand; Satisfaction guarantee