Hi, TK. I am sorry the Crest 3D Whitestrips didn't stay on your teeth. I am sure this was very frustrating and I am glad you brought this to our attention. I would like to offer some tips for you to try to get the strips to stay on your teeth. Do NOT brush immediately BEFORE applying strips. (Strips can be applied 30 minutes after brushing.) Find zigzag slit. Separate slit to expose edge of textured whitening strip. SLOWLY peel strip off clear backing. The "sticky" gel side goes against your teeth. The gel side must be against your teeth for the product to work - and stay in place. Using a mirror, place strip on front teeth, aligning the strip with your gum line. Press gently to ensure good contact with teeth. Fold the rest of the strip behind the teeth to keep in place. The gel on the strip comes in contact with spaces between teeth so they'll get the same exposure as the front surfaces of your teeth. However, you can gently work the strip into the tough to reach spaces between your teeth after you've applied the strip. Wear for the length of time indicated on the box. To remove, grasp the strip between your index finger and thumb and pull if off your teeth. If these tips will not work well for you, please give us a call at (800) 607-5514, M-F, 9 am to 6 pm, EST. We are here to help you.