evidence: Many people believe the colour blocks denote the kinds of ingredients in each tube of toothpaste. [...] The colour on the bottom of your toothpaste means absolutely nothing about the ingredients, and you shouldn’t use it to help you decide on a toothpaste. [...] "If you want to know what ingredients your toothpaste has, don’t look for a coloured block at the end of the tube. Instead, take a look at the packaging for a comprehensive list of ingredients."