evidence: Social media and internet articles on this topic, known as toothpaste color coding, insist that the colors on the end of the toothpaste indicate what the ingredients are actually in the toothpaste. As much as we love cracking and figuring out secret codes, in this one there's actually nothing to crack because it's completely false. These symptoms have nothing to do with the ingredients in your toothpaste. As it turns out, they mean something else entirely. [...] According to the posts, green marks mean the toothpaste is made from only natural ingredients, blue marks mean it contains a combination of natural ingredients and medicine, red marks mean it contains natural ingredients and It's chemicals, and black marks mean it only contains chemicals. The posts warn people about toothpastes with red or black labels and encourage people to choose toothpastes with green or blue labels. [...] If you want to know what ingredients are in your toothpaste, don't look for the colored block at the end of the tube. Instead, take a look at the package for a comprehensive list of ingredients, or you can talk to your dentist about how each ingredient works to keep your mouth healthy and which toothpaste is best for your needs.