What is is: The Colour Corrector teeth whitening Foam neutralises yellow tones and brightens tooth shade through colour correction technology. We've cancelled yellow stains. Purple is directly opposite yellow on the colour wheel and is therefore its complementary colour, so a water-soluble purple dye is applied to your teeth to cancel out any yellow undertones. V34 Color Corrector Foam is also vegan and cruelty-free. Benefits: - Whitens teeth - Neutralizes yellow stains - Strengthens teeth - Makes teeth more resistant to staining Ingredients list: Aqua/Water, Glycerin, Xylitol, Polyglyceryl-4 Caprate, Tetrasodium Pyrophosphate, PVM/MA, Copolymer, Lauryl Glucoside, Benzyl Alcohol, Caprylyl Glycol, Sucralose, Benzoic Acid, Mint Flavour/ Aroma, Lecithin, D&C Red No. 33 (CI17200), FD&C Blue No. 1 (C142090).