Seem to work. They do make my teeth extremely sensitive to the point where it hurts to breath even with less time than recommended I wish I could do it more but I know it destroys your enamel.

You can NEVER go wrong with using these. However, I find that every time after using a white strip, my teeth become extremely sensitive for a couple hours so I tend to not use these often.

This definitely whiten your teeth but are hard to rip off and kinda pricey. I've used this many times. Makes my teeth pretty sensitive so that's uncomfortable. If it didn't cause that I would say it is 5 stars

I love, love this whitening kit! My teeth get stained from coffee and chewing tobacco, but this whitening kit takes away those stains within a few uses!

I love using the crest white strips! I put them on while I'm getting ready. They make my teeth super white! You can really tell a difference after a short period of time!

These actually work! The only downside is that sometimes it gets your gums, which stings. And you get super slobbery while they're on, but you get used to it.

These keep my teeth white but also makes then sensitive. I will continue using however I usually apply one strip a week instead of daily. This way I can keep drinking my hot coffee every morning.

these work so well! they left my teeth looking snow white. they are extremely effective and definitely the product to use if you are looking for quick whitening!

These are the bomb. I definitely see a difference when I use them. The only reason I deducted a star is because the edges of the bottom strip come up on the sides when using them.

Very expensive but they do work. My teeth get very sensitive so sometimes I have to take them off earlier than usual but my results are still great . I don't do it often since it's not good for the teeth