Left my teeth feeling sensitive. Which I believe is true of all white strips. I did see a difference in minor caffeine staining.

These strips whitened my teeth so quickly! My teeth were a-little sensitive after, but for me that was the only drawback.

I don't use this as often as I probably should lol but I do love these strips and I never have a problem with sensitivity after I use them.

These were a great jump start on the teeth whitening process. You can definitely notice the difference but the process isn't fun.

I love this stuff, its wonderful. After just a few days of using this product I felt like Jonah hill when he played Donny in the wolf of wall street.

I love this product! You really notice it after a few uses! People always complement me and I tell them my secret! It's just great!

Although a bit pricey, this product does seem to make a difference in the appearance of my teeth after the first few days!

This really works but my teeth are sooooo sensitive after! I try not to use this often. BUT it does work!

I really enjoyed this product and could see results after a few uses! It's simple to use and helped me get white teeth.

I decided to buy some Crest Whitestrips after not using any for 3-4 years. The results of the Professional Effects strips were amazing!!!