Opalescence tooth whitening gel contains PF (potassium nitrate and fluoride), which helps improve the overall health of the teeth and increase patient comfort during the whitening procedure.1-5, Formulated to prevent dehydration and shade relapse, Four concentrations for treatment flexibility, with wear times from 30 minutes to overnight, Three flavors: Mint, Melon, and Regular, Day or night wear, Sticky, viscous gel won migrate to soft tissues and ensures tray stays securely in place