Effective and gentle
[[VIDEOID:c6dd4c8b105b409b0a5743e749458c27]] I've been using these whitening pens for some stains on my bottom teeth and I've had some very satisfying results.  I've not had any sensitivity develop, but I've seen the stains get much better.  This is a great value and I highly recommend these pens.
Rating: 5 stars