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.

We strive to offer our consumers a convenient and effective solution for whitening their teeth at home, and we are disappointed to hear that you had some sensitivity and issues with getting the bottom strips to stay on your teeth, Roxane. All of our products go through extensive testing to ensure their effectiveness and safety, and this is not at all the experience that we would like you to have. We can understand the frustration with those strips not sticking, and we would like to offer some tips to help with keeping those in place. Our Crest Whitestrips stick better to dry surfaces. You can try drying your bottom teeth first with a paper towel, tissue, or by breathing in, then apply the strip to dry teeth. It is also important to note that 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. To help with avoiding sensitivity, we recommend using the strips every 2-3 days, or alternating using them on the top and bottom teeth. If the discomfort persists, we would suggest discontinuing the use of the product. We would love a chance to learn more about your experience so we are better able to assist you as well as gather some additional information for our Quality and Safety Teams, and we invite you to give our team a call at (800) 395-8423.

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.

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.