Thank you for sharing your feedback, Gwendolyn. We’re sorry to hear about your disappointment and that you didn’t get the results you were hoping for. We want to reassure you that the formula has not changed; the whitening ingredients and their effectiveness remain the same. Only the packaging and product name have been updated. The previous name was Crest 3D Whitestrips Professional Effects Advanced + Supreme Bright Boost Whitening Kit; it's now called 3D Whitestrips Professional-Level Whitening Effects + Monthly Booster Whitening Kit. If you have any further questions, please feel free to call us at (800) 566-7252.

Our products go through many quality checks to make sure you receive the amount listed on the label, so we're certainly sorry to hear about your recent purchase. In order to learn more about your experience to share with our Quality Team, and to help further, please give us a call at (800) 395-8423.

Thank you for sharing your feedback. We're sorry to hear that the lower whitening strip did not adhere properly to your teeth. We'd appreciate the opportunity to learn more about your experience and help troubleshoot the issue. Please give us a call at 1-800-492-7378, and our team will be happy to assist you.

We're sorry to hear that your teeth were left sensitive after using Crest 3D Whitestrips, and we hope you're feeling better. Some users may be more prone to sensitivity than others, 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. If discomfort persists, we recommend you discontinue using the Whitestrips. So we can learn more about your experience and help you further, please give us a call at (800) 395-8423, 9 am-6 pm EST, Monday-Friday.

We're incredibly sorry to hear about this, Tracee. It may be possible that you need to use an additional kit to see the whitening results you were hoping for. We'd like to connect about this, and help. Please call us at (800) 395-8423.

We appreciate your feedback, Sharon, and are very sorry our Crest 3D Whitestrips Professional Effects & Supreme Bright Whitening Kit didn't meet the quality expectations we both expect. You deserve to have a brilliant smile and to help you get it, please call us at (800) 395-8423.

Elizabeth, we're so sorry to learn you didn't get the whitening results you were hoping for with your recent package of Whitestrips, and want to help. We would expect you go get the same results you've come to know, no matter where you purchase your Whitestrips from. Consumer testing and clinical studies have shown that Whitestrips are effective. However, if you have stubborn stains you may need to use a second box of Whitestrips to achieve the results you want. So we can help further, please call us at (800) 395-8423.