GO WHITER Pre-Whitening Gel. 

Clinically proven to whiten teeth in fewer days with Smile Whitening System. 

Safe to use with the leading teeth whitener.  Pre-Whitening Gel represents the latest innovation- a patent-pending "primer" technology that optimizes the teeth whitening process for speed AND comfort. 

Adding this simple step allows you to easily achieve a sparkling white smile.  Pre-Whitening Gel is a clear, flavorless, "primer for the teeth".