The Mystery of the Colored Line on Your Toothpaste Tube

This is an alternative to blue toothpaste that isn’t quite as appealing. A red stripe indicates that the toothpaste contains both natural and synthetic components. As a general rule, it’s preferable to live your life with little exposure to toxins.
A green line on the tube of toothpaste
To some, the presence of a green stripe on a tube of toothpaste suggests that it contains only natural components. By “all-natural,” we imply that the toothpaste is free of any synthetic ingredients, preservatives, or whitening agents.

A cyanotype

If a toothpaste has a blue stripe, it might be a combination of natural ingredients and a medication. When people say that toothpaste has “added medications,” they can mean that it contains certain pain killers or whitening agents.