It "works" ok but is a total nuisance to apply and the mouthpiece is not well-designed to stay in place. Whitening strips are superior for ease of use by far.

When I used this....the gel would get hard after being under the light....then come off after I would brush my teeth

LED light stopped working after two uses, I'm having no luck getting any support from Colgate for a return. Don't waste you hard earned money!

Using the pen as instructed and no noticeable changes after 4 weeks of use. Not a fan. Will try something different.

The pictures in the ad about the great whitening is of two different people. I won't buy anything with false advertising.

Great way to whiten teeth. It's very easy to use. Great results!

After using for over 10:days I really didn’t see any difference.