Who wouldn’t want to have perfectly white teeth? There are so many ways that influence our teeth from getting discolored and stained that ways to bring back their healthy shine are getting more and more popular these days. Have you heard of the Opalescence tooth whitening system and other professional or take-home whitening products that can give us back our pearly-white smile? Are they really effective? And are tooth whitening products tested on animals? Here is some basic information about both professional and natural teeth whitening, and what Opalescence tooth whitening system and the likes can do for our smile.