You can find fluoride in most toothpaste products. It's a natural mineral that hardens tooth enamel to prevent cavities. However, if you want to choose an alternative to fluoride toothpaste for you or your young children, several options are available. But what is in fluoride-free toothpaste? Read on to learn more about the most commonly found ingredients in non-fluoride toothpaste, including natural and plant-based ingredients.