These strips made my teeth super sensitive. I used them for 3 or 4 days and then had to stop because my teeth were too sensitive. I wasn't noticing that big of a difference in whiteness either

I feel like I didn't see a huge difference and it made my teeth sensitive. Maybe if I used these continuously there'd be a difference but I don't want to deal with the teeth sensitivity for such a prolonged amount of time.

I feel like they begin to work but they always leave you wanting more. I started using these around 2007 and while they have improved the strip you still must use them everyday.

I really like these white strips. I find them very effective but sometimes they make my teeth hurt a little. I can definitely tell a difference in the color of my teeth so I am very satisfied with the results. I would definitely recommend!

These teeth got my teeth so stinking white! I haven't whitened my teeth in almost 8 years and still get compliments on how white my teeth are. It's been maintained by crest 3D white toothpaste but it's pretty incredible.

I find that one round of strips is not enough for me to make a noticeable difference. I'm afraid to use too many days in a row/ frequently for fear my teeth will soften. Definitely makes my teeth more sensitive.

it works amazingly well! i use it about one a week, the only downside is that the product itself leaves my teeth very sore and painful, but overall very effective!

This product works really well for me. I have nothing to compare it to because I haven't tried other whitening products but so far it has worked extremely well!

I like this product! I actually saw results after a few weeks and my teeth look whiter. I will definitely get this product again and recommended it to my friends.

These whitening strips have drastically transformed my smile! My teeth are much whiter after i started using this product. I usually use the 30 min. strips because the hour long ones seem to bother my sensitive teeth.