I was pretty excited to try this whitening pen when I got a sample courtesy of the brand. First thing that's important to note is that it needs to be twisted a lot when you first open it to get the first bit of product out. I got discouraged at first and thought that it was defective, but after a bunch of twisting it works just fine.

It freshens your breath temporarily and leaves them feeling clean. I tried it towards the end of a day when I hadn't brushed my teeth for several hours and it made them feel much cleaner and smoother (you know that freshly-brushed feel I'm talking about).

It's supposed to help prevent stains if you use it after eating blueberries or drinking coffee, red wine, etc.