First of all, the product does what it says. My teeth were visibly whiter in two hours! I thought it was an impossible feat, especially considering I used to use the twice daily for 30 minutes whitestrips and basically got the same results. Also, they stayed on very well for the whole two hours!

The downside for me is that my teeth were extremely sensitive for a few days following using these whitestrips. Even breathing on my teeth hurt! I have relatively sensitive teeth to begin with, but this was almost excruciating.

I received these strips for free from the company in order to sample and give feedback.

I've used Crest Whitestrips before but never the 2 hour express. My teeth going into this were looking pretty good so unfortunately I didn't see a major difference in colour but I'm getting really great feedback from friends on how my teeth look and even my dentist asked if I'd had them whitened!

With the shorter duration strips I didn't have any teeth sensitivity but with these I did a wee bit. Nothing major but enough to mention.

I've heard it promoted that you can wear these and no one will notice but I don't find this to be true. They do get a bit 'gummy' as time goes on and while not hugely noticeable, not invisible either.

I really didn't see much difference in my teeth. I have had my teeth done by the dentist and there was better results. Only used Crest 3D a couple of times the prices are a rip off. Quality none and effectiveness hardly any so sad because it would have been a great product if it had of worked.

Fantastic! The 2 hr crest strips worked gret noticed it right away lots of compliments

I got a box for Christmas and was very disappointed. I did not notice any change in the colour of my teeth

I tried this and I was pleasantly surprised. It exceeded all my expectations. After treatment, it really whitened my teeth. It made a big difference. I'll do it again every year.

I wanted to do a whitening treatement at my dentist office and he first recommended me to try this product so I was extremely happy to receive a sample in the mail with my P&G;box. It really works well.

I've tried different teeth whitening strips and kits and this one is by far the best. These strips made a noticeable difference. They definitely whiten my teeth better than anything else I've tried. The strips stick well and don't move around and they are not overly foamy. Furthermore, they are much more convenient then using strips twice a day for seven days. Crest 3D White Whitestrips 2-hour Express have become my go to for teeth whitening.

I've received plenty of samples of the Crest 2 Hour Express through the P&G;mailers. With a wedding coming up this weekend, I noticed my teeth were looking a little less bright than I would prefer. I planned to purchase a new box of Whitestrips, but remembered my stash of 2 Hour Express. I hadn't used them due to the time (2 hours is scary!), and the equally scary reviews online (some claim they had to take prescribed pain medication to numb the sting).

I've done complete cycles of Whitestrips every few years in the past, and do find I get some sensitivity from day 4 onward, sometimes a sharp pain in my front teeth which are filed down. I also usually get increased sensitivity to hot, and especially cold for a few days.

Surprisingly enough, the 2 Hour Express strips had a milder effect than the Intensive Effects strips. I found the adhesive to be excellent, it stuck very well and didn't allow a lot of saliva in. They stayed put for the entire two hours without sliding around, and allowed me to take sips of water as needed. I could talk easily with a slight lisp (I used the strips while cleaning the house and paying bills/making errand calls).

In terms of impact, they whitened very well. Enough to noticeably brighten, but not to get a full whitening. I did one strip on Monday, another on Wednesday, and the effect was enough to get two compliments from coworkers.

In terms of sensitivity, I found that I experienced no sensation whatsoever while using the strips. From 12-24 hours after each strip, my teeth grew increasingly sensitive, mostly to cold. I had to keep my mouth closed outside as the breeze was uncomfortable on my teeth. I found the sensitivity went away by the second day.

I will definitely use again as maintenance, perhaps every 2-3 months as Crest recommends. I will still need to purchase a full box to fully whiten my teeth, but for a quick solution, 2 Hour Express exceeded my expectations.

Gotta Love Crest! The whitening works well and you don't have to leave it on too long. Can be expensive though, hunt for those sales. Would recommend it.