Has anyone tried the Nutribrite teeth whitening product? If so, did you like it? How does the process work?

I have been looking for a cheaper way to brighten my teeth a little. I'm a coffee drinker, and my teeth are starting to show it. Before I try this Nutribrite method, I want to make sure that those who have tried it already are happy with it. Thanks in advance!
--------------------
Does not work!!!!
Source