They work great! After only one use my teeth are noticeably whiter. It does however hurt my husbands teeth, so if you have sensitive teeth it might not be for you.

It didn't have a big whitening affect on my teeth. They were partly uncomfortable and left my teeth sensitive. However it did whiten my teeth a bit so I have to give it that.

This product is effective. It works as advertised. Prior to the product, i had no experience with whitening my teeth. Literally after one use, my teeth were 10x whiter. This is a really good product to try and even use!

This product is the best option for me. The 1 hour express makes my teeth too sensitive but this works beautifully. You have to be diligent with it until the product is used up but it'll be worth it.

After just one use my smile is soo white and bright. It doesn't slip while using which is very useful. It does though make my teeth a little sensitive.

This teeth whitening product whitened my teeth fairly quickly and very well. I was a bit skeptical about it at first but it really does work and should be given a try

I always get asked how I get my teeth to be so white. People can't believe it's done at home when I say it's crest 3D whitening strips. They're super easy to use and are completely fool proof.

I bought a box of these and could only use one and had to take it off early. I typically do not have sensitive teeth but these were painful to use and sent shooting pains into my nerves! I haven't been brave enough to try a second time.

They do get the job done. But I just wish they made the strips longer for the back of your teeth. Also they hurt my teeth and make them too sensitive.

Great when you need a quick whitening before a big event or date. Gets your teeth a couple shades whiter in a matter of 25 minutes. I use these on rare occasions so I don't buy regularly but for someone who needs then, would recommend.