Our extra strength 44% carbamide peroxide teeth whitening gel is for those who are looking for a whitening boost from our standard 35% carbamide peroxide gel. The 44% gel uses a stronger formula to wipe away deep tooth stains or stubborn stains that won’t go away. ​​Developed with a stronger whitening formula to lift the most stubborn stains and reveal your glowing smile. This gel is designed to remove stains from coffee, wine, smoking, aging and more.