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High Viscosity Gel is important because it allows the gel to stick to your teeth. This is essential to the whitening process. If a gel is not highly viscous, your whitening gel will leak out of the bottom of your bleaching tray. That slows the whitening process and creates unneeded sensitivities. As well, saliva can dilute a low-viscosity gel, rendering it non-effective. Our gel is a 22% High Viscosity Gel that is guaranteed to remain on your teeth throughout your bleaching sessions.