Anti-theft program. Levels 28 whiter. Removes over 20 years of stains in 3 days. Our highest peroxide level available. Professional level whitening removes over 20 years of stains. No slip technology. Enamel safe. Crest 3D Whitestrips use the same whitening ingredient as dentists. Peroxide layer. With a comfortable, no slip whitening experience. No. 1 dentist recommend at-home whitening brand.