Colgate® Max White Expert White™ is the first ever toothpaste in the UK to contain a professional whitening ingredient, hydrogen peroxide, which is clinically proven to whiten teeth deeper than other toothpastes. It whitens teeth after just 5 days by removing extrinsic surface stains, it also significantly whitens teeth after 4-8 weeks by acting on intrinsic stains deep below the teeth’s enamel. 7 in 10 women who tried it, agreed that after just two weeks their teeth were visibly whiter as a result of using the product* * Expert White ICPT France Report 2014