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 teeths enamel 7 in 10 women who tried it agreed that after just two weeks their teeth were visibly whiter as a res