evidence: The truth is: the toothpaste color-coding system simply doesn’t exist. Oral care companies don’t mark their toothpastes with colored squares to try to trick consumers and hide ingredients from them. We’re sure you’re wondering, so why are there color blocks on toothpaste tubes then? We’re happy to report that they do, in fact, have a purpose! They actually help in the manufacturing of the toothpaste tubes by telling light sensors where the end of the tube is so that it can be cut and sealed properly. We know, it’s not as exciting as a secret code, but we think the truth is pretty cool too. [...] If you want to know what kind of ingredients your toothpaste has, don’t look for a colored block at the end of the tube. Instead, take a look at the packaging for a comprehensive list of ingredients. You can talk with your dentist to learn more about how each ingredient works to keep your mouth healthy and what kind of toothpaste would be best to meet your needs.