Yes, I have tried these pens. The brand I tried was called Idol White and I love it! It works just as good as the Crest whitening strips but the pen is more convenient. Plus I can never go back to using Crest strips since I’ve come to realize that they, well, taste kind of like jism =X. Anyway, you should give Idol White a shot. Here’s a news article about it.
http://news16.tv/whitening-pens.php
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