Opalescence PF 15% carbamide peroxide tooth whitening gel. Moderate teeth whitening for normally sensitive teeth. The advanced Opalescence PF formula reduces tooth sensitivity while still providing whitening results. High viscosity gel maximizes whitening effectiveness and has a sustained release for consistent bleaching. For use with custom tooth whitening trays only. Each syringe contains 1.2mL of gel. Gel has 1-2 year shelf life. Includes 4 syringes/gels of 15% carbamide peroxide gel in a delicious melon flavor.