Professional Effects18 Levels WhiterRemoves Over 15 Years of Stains in 3 DaysUse Once Per Day for 45 Minutes20 Treatments (Each With 1 Upper/1 Lower Strip)No-Slip TechnologyPeroxide LayerEnamel Safe: Crest 3DWhitestrips™ Use the Same Whitening Ingredient as DentistsWith a Comfortable, No-Slip Whitening ExperienceDesigned to whiten like a professional-level whitening treatment.