V34's Colour Corrector's combination of two water-soluble dyes allow for any shade of yellow to be cancelled for the brightest smile, without leaving behind any residue.
I tried this because of all the advertising and hype about how good this product is. Well let me tell you. It does NOT work as it is portrayed in the advertising online. I have used it for 1 week and no difference, just in case it took a bit longer on my teeth. Waste of time and money. Don't bother purchasing it, just save your money