I bought a box of these...they are pretty pricy, but they are very effective at whitening your teeth. I used the 2 hour ones, and about 1 1/2 hours in, \I started getting a pretty piercing pain, coincidentally my son got the same thing, but it lasted only 2 minutes, and was gone. My teeth were quite sensitive to cold for a couple of days after, but worth it to me to brighten my smile. Just an aside, there are 8 dollar coupons available for Canadians...do a google search and you should find them easily.

I like how they work, they really do make your teeth whiter.

These strips definitely whiten your teeth! The only thing is you have to do it everyday for the full effectiveness!

Ive used these strips twice in the past and I love the results!! WIthin a couple days I notice a difference and although your teeth DO get sensitive, its not unbearable to deal with! At least not for me it wasnt. The only downside is if you want lasting results, you have to keep up for the whole line of products and use them religiously..I know its all way too expensive for me to keep up!! Although my teeth were never disgustingly yellow, they have now returned to their original colour..booo! :(

I was excited to get this product in the mail. I've always been complimented on how white my teeth are but since the last two years of drinking coffee and red wine, I feel they aren't as white as they used to be. After trying Crest 3D whitestrips I did feel that there was somewhat of a difference and I would definitely try these again in order to maintain white teeth.

I've used this product in the past and was pleasantly surprised with the results. My teeth did get whiter over a few times of using the strips. It is a simple product to use.

I got a few of these as samples and am super impressed. I have tried the other Crest whitestrips and hated them mainly due to the fact that they were so slimy and sipped all over the place in your mouth. These hold true to their name and really do have an 'advanced seal". They stick really well to your teeth and don't slip all over and you don't get left with that disgusting taste in your mouth. They feel a bit odd on your teeth because they are thicker than other kinds, but much easier to use and seem to get your teeth whiter. My teeth were not very discoloured, but I did notice them to be a bit whiter/brighter.