Honestly, I've never been in such tooth pain. Used it ONCE for the correct amount of time, and the pain kept me up all night. I still can't eat or drink and it's the next day. My teeth are on fire and my gums are throbbing.

I love this kit and it is super effective, but my sensitive teeth hurt a little bit into the treatment, but that wasn't such a big deal. I lived the results but it was pretty expensive, so I recommend looking for a dupe.

I like these. They make my teeth really white but I don't keep them on for long because they can and WILL ruin your enamel and make your teeth sensitive which is something you don't want.

They made my teeth a lot whiter initially, so yay, great for job interviews or picture day or whatever, but it faded quickly and left some sensitivity issues, and also it's pretty expensive.  So YMMV. 

This is a really good product if you want to whiten your teeth. It's super convenient and easy to use. it's bad for your teeth if you use it multiple times a week but 10/10

This product does really whiten teeth but I have really sensitive teeth and it made my teeth hurt so bad. I didn't even get through a few applications without having to throw it away because I was in too much pain.

The whitest smile in years after using Crest Whitestripes. My co-workers comment all the time how white my smile has been. I, now, am ready to make another purchase. I will always go back to using this product.

Got a great BOGO deal on this from the website. It truly whitens. It makes your teeth sensitive so I would recommend getting a sensodyne or a similar toothpaste to help with that.

It's good. Easy to use and effective. Have to be consistent with this product. I am a first time user. I have been pretty impressed by it. It is effective. I would recommend this product.

THESE WORK WONDERS!! I love a white smile and these really get you there! They are so easy and simple to use! I put them on before leaving the house and take them off right before i get to my destination! Amazing and convenient