Opalescence teeth whitening offers various options for those seeking a fast and effective way to whiten their teeth. Available in simple-to-use syringes for use with tailored take-home whitening trays, Opalescence tooth whitening gel is easily customizable for your individual situation. With three flavors and five gel strengths that offer flexible wear times for day or night, you can get a whiter smile in the comfort of your own home. The carbamide peroxide teeth whitener in the gel acts fast to give you a noticeably whiter smile and comes in 10%, 15%, 20% or 35% concentrations. Opalescence 10% gel: wear 8 to 10 hours per day Opalescence 15% gel: wear 4 to 6 hours per day Opalescence 20% gel: wear 2 to 4 hours per day Opalescence 35% gel: wear 30 to 60 minutes per day