A blue line
Toothpaste with a blue stripe might mean it is a mix of natural toothpaste and medicine. When we talk about « added medications, » we are referring to toothpaste possibly having whitening ingredients or specific pain relievers.
The worst color to find on your toothpaste packaging is a black stripe. A black stripe means the toothpaste is entirely made from artificial chemicals. This is not something you should eat every day.
