Jamie, we're so sorry to hear you experienced discomfort, and hope your teeth are feeling much better. Please know, we have many safety checks in place to ensure our products are safe to use as directed. Some users may be more prone to sensitivity than others and, as with any teeth whitening product containing peroxide, sensitivity or soreness may temporarily develop when using 3D White Whitestrips. This isn't harmful. The irritation is temporary and will subside, and there are steps you can take to reduce/eliminate this sensitivity. It is okay to use 3D White Whitestrips over a longer period of time by waiting a day between applications, or alternating between using an upper and lower strip. Doing so will cause whitening to take longer, but will not cause a change in the overall whitening effect. We recommend only brushing twice per day, and using a soft toothbrush. So that we can help you further, please give us a call at (800) 395-8423.

Thanks so much for leaving your review, ninat80. We're glad to know our Crest Whitestrips worked to brighten your smile! We're sorry, however, that you felt pain and sensitivity when you first started using them. Should this occur next time, we'd recommend that you discontinue use and wait a few days, then resume treatment. So we can gather more information about your experience to share with our Product Health & Safety Team, please give us a call at (800) 395-8423.

A whiter smile is definitely a plus, however, we're sorry hearing you've had sensitivity after use. While Whitestrips are very safe, like any whitening product that contains peroxide, temporary sensitivity may develop. We'd like to share some tips that can help in avoiding sensitivity in the future. First, while using Whitestrips don't brush more than twice a day, and brush gently using a soft bristled brush. Using a mild toothpaste such as Crest Cavity Protection can also help. Another tip is to use the strips over a longer period of time by waiting a day between applications, or alternating between using an upper and lower strip. While it may extend the length of time using the strips, you'll still get the same great results. Your astisfaction is very important to us, and we hope you'll get in touch with any questions or concerns. Please give our Crest Team a call at 1-800-395-8423 from 9AM -- 6PM EST Monday–Friday.

Thanks for leaving your review on Crest Whitestrips, kellyd252; we’re glad to know you like them! We're concerned if you experienced sensitivity, however. Whitestrips are rigorously evaluated to ensure their safety when used as directed, so we’d like to learn a little more about the kit you have or had and share that information with our Product Health and Safety Team. Please call us when you get a chance at (800) 395-8423.