We're sorry you've found this product to be one that causes you sensitivity. While all of our products are safe and effective, some people may not tolerate a particular formulation. Flavor oils, surfactants/foaming agents, tartar control agents, and abrasives all have some potential to cause irritation, and we're sharing your report with our Product Safety Team. If irritation persists or becomes uncomfortable discontinue use and consult with your dentist. Your satisfaction is very important to us, and we’d like to learn more about your experience to further help. Please give our Crest Team a call at 1-800-492-7378 from 9AM -- 6PM EST Monday–Friday.

We are so glad to hear that these strips are helping you achieve a sparkling white smile, and that you have found them to be a great deal! All of our products are thoroughly evaluated for safety, and any teeth whitening product containing peroxide can cause sensitivity, but this isn't harmful. The irritation can be reduced by following these tips: -Don't brush too hard and or more than twice a day. -Avoid medium to hard bristled toothbrushes after whitening your teeth. -Try a different toothpaste, like one for sensitivity. We would love to hear more about your experience, so please give us a call at (800) 395-8423.

While we're glad to hear that you're enjoying brilliant results with our Whitestrips, we're sorry if you're experiencing some sensitivity. We can assure you that our Whitestrips have been thoroughly evaluated to be safe when used as directed, and the whitening ingredient peroxide - the same enamel safe whitening ingredient dentists use for tooth whitening - is at a level that is in line with regulations. However, some users may be more prone to sensitivity than others, and there are steps you can take to reduce/eliminate this sensitivity. We suggest not brushing too hard, or more than twice a day during treatment, and to consider a softer toothbrush in place of a medium or hard bristled brush. We hope this is helpful. We'd also like to gather some more details for our Safety Team, so please give us a call at (800) 395-8423 when you can.