You might have spotted Megan Gage on Shark Tank, the ABC show where aspiring entrepreneurs pitch their products to big-time investors. That's where we first learned about Hot Tot, the Castle Rock mom's line of safe and natural hair-care products (free of the usual parabens, formaldehydes, and other potentially hazardous chemicals) for children. And they work—so well that billionaire Mark Cuban invested $75,000 for a 40 percent share. The salon-exclusive line can now be found in 27 states and three other countries (Canada, Singapore, and the U.K.). We've tested Hot Tot, which smells like powdery-fresh Cabbage Patch Kids, on our children's hair and have been so impressed that one editor even started using the line on her grown-up locks.