Opalescence PF 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 PF 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 PF whitening gel also contains PF (potassium nitrate and fluoride) and is intended to be dentist-supplied and supervised. Opalescence PF 10% gel: wear 8–10 hours per day Opalescence PF 15% gel: wear 4–6 hours per day Opalescence PF 20% gel: wear 2–4 hours per day Opalescence PF 35% gel: wear 30–60 minutes per day