If you are not experiencing any sensitivity you may wear the trays for 1-2 hours and even sleep with the trays in your mouth. It is very important to remove all the excess material around the gums or the plate prior to sleeping with the trays. The darker the teeth the longer your teeth will take to get lighter.

Lightly tap tray to adapt sides to teeth. Unless directed otherwise, wear Opalescence 10% for 8-10 hours or overnight, Opalescence 15% for 4-6 hours, Opalescence 20% for 2-4 hours, and Opalescence 35% for thirty minutes. Remove Excess gel with clean finger or soft toothbrush.