I have the 7 day kit and it actually works!! Didn't get my teeth super star white but white enough to make me feel like I could smile for a picture. Definitely great for vacation bathroom kits!

I feel like these actually worked, but after a few times I got sharp pains through my teeth and gums when using, and it hurt so bad that I've been scared to try them again.

These work well but they started hurting my teeth so that's why the 4 stars. That wouldn't happen to everyone though necessarily so you may not have that issue. It did whiten my teeth a lot though!

Definitely not a one time use type of thing, but what is. I love this product and formula. I feel it could be stronger and a little cheaper than it is but it definitely works over time. Just need to stay consistent.

very good product. might make your teeth a little sensitive, but it's a good product and does the job, just follow the instructions very well and don't leave them on long

i like these but they make my teeth sensitive and also it feels kind of weird to have it in your mouth for so long, but i do notice visibly whiter teeth and i prefer this to dentist whitening

I have a couple of teeth that seem to stain a lot, with the help of the whitening strips these stains just disappear. If you have tough stains that you don't want then I suggest the 3 D whitening strips.

I absolutely love these. They 100% work, I don't experience any sensitivity while using them. I just wish they were longer as they don't go over all of the teeth.

Gets your teeth very white! Beware because it will make them sensitive if you keep using them. Worth the money when you need a last minute whitening for an event.

I use the system once a year, and buy an additional pack to do extra treatments once or twice a month. I love it! My teeth are gorgeous and stain free. I will forever use this product.