They work! I started using whitening strips in high school and have continued to use them since. I had braces and the idea of my teeth looking anything but white horrifies me. These whitening strips are an awesome at home treatment however if you are subject to teeth sensitivity as I am, don't use regularly as they do make your teeth more sensitive than normal after use. I use them leading up to a big event!

My teeth got so much whites after only 5 strips. I wish the upper teeth strip was a little bit longer. I usually whiten my teeth before going to bed because my lower teeth are quite sensitive after using these strips but if I do it before the sleep I wake up the next morning and my teeth don't feel sensitive at all.

These are my favorite and the only whitening strips that have truly worked for me! The picture attached I have no filter or editing on! People always ask how my teeth are so white and I always tell them these! If you're questionable, GET THEM! You won't regret it!!

These are the best whitening strips I've ever used. Ive used the stronger 1 hour more expensive ones and they made my teeth so sensitive and didn't even whiten as well as these. People at work even noticed and commented on how beautiful my teeth were.

I'm not the biggest fan of whitening strips, I normally prefer the whole UV light things, but these Crest whitening strips work very well. They whiten my teeth so well, and I like it enough to the point I will use them if I can't get ahold of my normal teeth whitening kit. 

LOVE LOVE LOVE!!! I used this right before my wedding and it worked great. However DO NOT leave it on for greater than 30 minutes. I did that on day 5 and had terrible pangs of pain. But they went away quickly. Please use it like 3-4 weeks before a big event so your teeth won't feel sensitive for a big event

I love the Crest white strips!!! Here is a video review and process of how much they whitened! (Hope it helps!) (Find it on Youtube under "Hair By Heather") Its a little rough having to leave them on for an hour (The ones I got) but so worth it and works so fast!

When it comes to my teeth I want to have the whitest teeth as possible. I don't like to regularly use crest white strips because it makes my teeth sensitive which is why are use the crest whitening toothpaste while I'm not using it. With using both I noticed a brighter smile in just a week.

Everyone wants a whiter smile, and many of crest's products have given us all the tools we need to achieve that movie star smile. While I don't necessarily have the memory to recall 14 years of staining my teeth, simply due to the fact that that is more than half of my lifetime and I did not make conscious decisions to improve my oral health, it seems as though the product removes my ignorant sins against my teeth and gives me a more confident smile. Thank you, Crest, for an affordable remedy that actually works.

My teeth are very sensitive when it comes to whitening strips so when it comes to them I tend to be super careful. I only use these once a week and I can see an amazing change in my teeth! They aren't to harsh but I would definitely recommend for anyone wanting whiter teeth!!! Plus, it does not take up a lot of time throughout your nightly routine.