This product is great! I use it for special occasions as touch up treatments, and it works well. It leaves your teeth visibly whiter after one treatment. I will say it can leave your mouth sensitive after use—so definitely wouldn’t use it everyday for a prolonged period of time.  But for a touch up here and there, i highly recommend this product. It’s a great price and really works.

I got these as a gift for my birthday. I've tried others before and I wasn't too excited to try another product that would irritate my mouth and not work. But these proved me wrong!! They're easy to use and I notice a differece already. I can't wait until I'm done!

I’ve only used this set once, mostly due to the high price. While it does whiten your teeth pretty well for being something you can get at the store, it did make my gums hurt/burn when the strips were on. This discomfort is not awful, but it seems like there are other ways to whiten teeth. For the price it does it’s job, but be warned about the burning.

I TRIED THEM A COUPLE OF YEARS AGO, AND HAD GREAT RESULTS. WANTED TO TRY AGAIN, BUT THIS TIME THE STRIPS SLIDE ALL OVER MY TEETH, AND BARELY STAY PUT FOR 15 MINUTES, LET ALONE 30 MINUTES. DID SOMETHING CHANGE?? AM USING TWICE DAILY FOR FAST RESULTS! LOVE THEM!!

[This review was collected as part of a promotion.] I recently tried the Crest 3DWhitestrips Professional Effects, and I can honestly say—they live up to the hype. I started seeing a difference after just 3 uses, and by the end of the 20-day treatment, my teeth were visibly whiter—like two shades lighter at least. Each strip fits well and stays in place (upper and lower), so I could still talk or move around without it slipping. It gave results similar to what I’ve gotten from in-office whitening—without the high price tag. I was worried about sensitivity, but I only had mild tingling once or twice. I used a sensitivity toothpaste during the process, which helped. If you have very sensitive teeth, start slow—maybe every other day—just to be safe.

I have tried other whitening treatments that did not work at all, but Crest whitening strips absolutly whitened my teeth in only 7 days. The intructions said to use it for 20 days but I stopped after 9 days since my teeth were already so white. I will use it again in a few months to keep them white. Very happy with results.By the way I am 68 years old

I used this whitener as directed & the results were amazing! My teeth were stained with coffee & tea. These easy to use strips made my teeth a beautiful, glistening white so that my smile at my daughter's wedding was a real winner ...even in the photos!

These strips stayed in place during the whole process. They are very effective after a few days of using them. I personally hate the taste and smell and find it difficult to swallow while using them for fear of swallowing the gel, so any white strips make me drool. However, I think these are easier to use than whitener trays.

I love how easy these strips are. I definitely noticed my teeth looking brighter within a few days. The only drawback is that it does add some sensitivity to my teeth. Love how easy they are to apply and how many stores carry them. I feel like they are a little pricey but they do work well.

Used Professional Effects in the past with AMAZING results, as have many of my friends and family. So many people swore by it — and for good reason! It did exactly what it promised. So why on earth change something that was already perfected and loved by many? Change is not always for the best. The purple boxed Luxe should have been a permanent product. These new strips neither adhere sufficiently, nor whitens evenly, or even half as well as the former ones. Extremely disappointed in the change of line. I'll never understand why companies feel the need to "update" products that WORK. If it does what it's supposed to and impresses people with the results, then leave it alone! Loyal consumers will thank you by coming back for more. As it stands now, I will not be wasting further money on this overpriced junk. A real shame, since I would have repeated my purchases on the older strips for as long as it was available/needed. Don't cheapen your products. You were doing good work before.