The whitening process is pretty simple. I had a mould taken of my teeth at the dentist, within half an hour he had made a plastic tray, similar to a mouth guard, that slots over my teeth. Before bed, or during the day as long as i leave it on for at least an hour, I put Carbamide Peroxide gel into the trays, focusing it at the front. I have 16% and 10% gels. As long as I use the same percent on both sides of my mouth it is fine. I then sleep in the trays and let the Peroxide work its magic. Its already noticeable. So to hell with the pain I refuse to let nature helm my insecurities any longer. I'm going to buy some Sensodyne tomorrow and get on with my life.