This product does whiten teeth, but at the cost of comfort. Leaves teeth feeling sensitive and susceptible to new stains very quickly. I've only used the treatment one full time through, but the results were not worth the tooth sensitivity.

I recently used these and I was not impressed with them. I didn't notice much of a difference on my teeth. I have used the one hour express and those are good!

As much as I love crests other teeth whitening products. This one let me down. I didn't seem to think these helped improve my smile. I used bought one box and haven't bought since. Overall I didn't care for this product.

These work amazingly well. I'd say they work almost as good as my dental office grade ones. I've had good results by using these and the whitening effects last for 6 months or more for me.

This strips are amazing. I definitely see results whenever I use them. I tend to get a bit of sensitivity, so I just use them every other day and the results are still amazing.

I love these ! They make your teeth super white, especially before an event and don't cost nearly as much as professional whitening. I have sensitive teeth and I haven't found any issues.

If you want white teeth use this. You don't need to get professional whitening done this works the same! I love having white teeth and this is the easiest way to get them sparkling white!

This product definitely works very well. After I finished the box I noticed my teeth were alot whiter and I got a ton of compliments on my smile!no have repurchased this several times over the years

I have a love/hate relationship with this product! I love it because it whitens my teeth at a reasonable price but sometimes it hurts my teeth! Which it's not too bad but It does.

My dentist always asks me how my teeth are so white and it is because of this. I use them randomly throughout the year instead of a short treatment to decrease the sensitive of my teeth with the product!