evidence: A post shared on Facebook over 380 times claims the colored marks on tubes of toothpaste indicate the materials used in the paste. The colored bars on the tubes do not signify what ingredients are in the toothpaste. They are for sensors to help with proper sealing and artwork placement during manufacturing, according to spokespeople for toothpaste producers. The image shows three tubes of toothpaste each with small, colored bars at the end of the tube. In the image, the colored bars are circled. "The secrets of the colors in #toothpaste," the caption reads. "These colors are not for decoration, but the materials that were used to produce this paste." The caption then suggests what each color bar means, with green allegedly indicating "100%" natural ingredients and black supposedly meaning chemicals are present.