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As a successful beautician, she works with hair dyes and cosmetics every day and has first-hand experience with the amazing properties of color. She is particularly fascinated by color correction, that is, the relative colors on the color wheel, which are complementary colors, cancel each other out. POPWHITE often uses color correction. For example, to cover up the red spots on the face, the makeup artist at POPWHITE uses a green primer (because red and green are complementary products). When dyeing hair blonde, in order to neutralize dark yellow, the stylist uses purple toner (because yellow and purple are complementary products). This made Gail wonder why color correction, an incredible, simple, and natural color attribute has never been used before in oral care. If purple lotion can remove the dark yellow color on her client ’s hair, why can’t purple toothpaste remove the dark yellow stain on her teeth?