Smile Brilliant teeth whitening gel is professional grade. Our proprietary Stiki-Gel™ formula dramatically improves adhesion between the gel and your teeth. The environment in your mouth is both warm and wet. Lower grade whitening gel will quickly begin to lose its viscocity and start to run. This running causes the gel to fall to the bottom of your whitening trays and only whiten the bottom tips of your teeth. With Stiki-Gel™, the gel stays in place longer and has more time to work. The results are more consistent and uniform.