We want you to experience the best whitening possible with Utter White. We're confident our products will help you achieve a brighter smile, that's why we offer a guarantee on all products. If for any reason you're unsatisfied with your whitening experience, simply contact us for a full refund. For best results, we recommend using our products for at least 2 weeks. Results vary from person to person depending on the severity of stains, so whitening for an extended period of time. Warranty Utter White products are covered under a 1 year warranty for all manufacturing defects or product quality issues.The guarantee and warranty expressed above only apply to purchases on utterwhite.com.