The V34 Color Corrector is a gel that you brush your teeth with ideally after or to supplement a whitening treatment. The V34 Color Corrector serum is purple, which is key – opposite yellow on the color wheel, it helps to cool warmer tones and balance yellow undertones and brighten teeth. Utilizing the distinctive color-correction technology, it covers stains and enhances their brightness, and balances out the various tones in your teeth.