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You’ve probably noticed the little colored squares or stripes at the end of toothpaste tubes. Red, blue, green, black… they have given rise to countless theories online, especially that they reveal the contents of toothpaste. But is it really like that? Let’s get this straight. The viral news about toothpaste colors Numerous articles and social media posts suggest that the colored stripe indicates the type of ingredients contained in the toothpaste: Green = natural Blue = natural + medicinal Red = natural + chemical Black = all chemicals It seems useful, but there is a big problem. The reality: it’s a trademark Those colorful brands are not intended for consumers at all. They’re called “reference marks” or “registration marks” and are used during the manufacturing process. Machines read these marks to determine where to cut, fold, or seal the package. In other words: To see the full cooking instructions, go to the next page or click the Open button (>) and don’t forget to SHARE it with your friends on Facebook.

In other words:  They have nothing to do with the ingredients in toothpaste. Why the myth spread The idea stuck…