Nature's Smile is a company based in Miami, FL. It has an "F" rating with the Better Business Bureau and only six customer complaints. The company offers a 60-day money-back guarantee. Customers can also request a refund of their shipping costs if they are unsatisfied with the product. The company says its formula is based on seven different plants that kill bacteria exponentially. For more details on natures smile click this link https://icelandski.com/natures-smile-review/