Cristy, we're sorry to hear you didn't get the whitening results you were hoping for, and that our Daily Whitening Serum was messy. Please know, there are many quality checks in place to help ensure only the best products reach you. Results depend on several factors, such as application frequency, your age, and how yellow your teeth are. Most consumers will see whitening results after just a few uses. Correct application is super important to Serums working its best. We recommend you dry your teeth with a tissue or paper towel before applying. So that we can help you further, please give us a call at (800) 395-8423.

We're disappointed to hear you aren't enjoying the Daily Whitening Serum, Marie. If you'd like to share more with us or would like some information regarding the Crest Whitening Money Back Guarantee, give us a call at (800) 492-7378.

We're disappointed to hear you aren't enjoying your Daily Whitening Serum, or see the great whitening results as expected. In some cases, teeth stains have been known to be particularly stubborn, and need additional treatment. While our products have undergo extensive safety tests and have been proven to be safe with food-grade formulas, we don't recommend using them with a mouth guard as they haven't been tested for this. If you have questions or would like to learn about our Crest Whitening Guarantee, we ask that you please give us a call at (800) 492-7378.

We're sorry to hear this, Lina. With the extensive quality tests that Crest products undergo, this isn't the experience we expect. In some cases teeth stains can be pretty stubborn, and need additional treatment. If you have questions or would like to learn more about the Crest Whitening Money Back Guarantee, give us a call at (800) 492-7378.

Thank you for sharing your recent Crest experience with us, Michael. We're surprised and disappointed that you haven't seen the results you expected with our Daily Whitening Serum + LED Light Treatment. Our products undergo lots of testing to ensure top quality and performance, so we wouldn't expect this to be your experience. The average user will see noticeable whitening after 14 treatments, while some people take a little longer to get as white as they like. Very few people don’t respond to whitening treatments at all, so keep going! Correct application is also super important for the Serum to work best. We recommend you dry your teeth with a tissue or paper towel before applying. Paint the Serum in a downward motion onto your smile teeth, being sure to cover them completely, and then avoid eating, drinking, smoking, or chewing gum for 30 minutes. Lastly, avoid “brushing” in a circular motion while applying, and avoid reaching too far back into your mouth where the product will tend to mix more with your saliva. We hope these tips are helpful, but we'd like to learn more and try to make things right for you. Please give us a call at (800) 395-8423.

We're sorry to learn our Daily Whitening Serum isn't as easy to use as you expected, Mikey. To make it easier to apply, we suggest you "air dry" your teeth by inhaling air with your mouth open. You can also dry your teeth with a paper towel before application. So we can help further, please call us at (800) 395-8423.