I've always wanted to whiten my teeth, but I stuck to whitening toothpaste because I thought it was a less chemically intense option. These were on sale for $40 and I thought bought it on a whim (since none of the toothpaste options have worked well). AND IT WAS THE BEST DECISION I'VE EVER MADE ! After one use, I could kind of tell it was whiter and by day 2 - definitely a change. My teeth looked great after day 4, but I also had a bit of tingling / sensitivity on my teeth so I took a break. The strips are easy to use. I didn't stretch them but it covers all my teeth in front and a little bit more. It is a perfect snug fit. The only thing that I don't love is that it does leave a bit of peroxide taste in your mouth while you're using it. But for these results, it's definitely worth it. I would wait until it goes on sale again though because $70 does seem a little steep for items that aren't a basic need

So I have only tried these once as I got them as a sample - so of course I didn't see and improvement with whiteness of my teeth, but I thought I would stop by and share my experience.
I loved how the strips foamed up after being applied and in your mouth for a few mins, but it made my tongue numb and irritated from where it would touch.

J'aime beaucoup ces bandes blanchissantes ,après seulement une utilisation on voit une différence et ainsi de suite.Par contre,c'est pas vraiment agréable à utiliser puisque c'est un peu long ,mais ça en vaut le coup!

After just one use I noticed a difference, I liked how they fit on your teeth. The box is about 70.00 but it is so worth it. It comes with 14 days worth. It covers more of your teeth because you are able to stretch them out. I am a new lover of these strips, I am completely sold after noticing a difference after just one use.