im using the gosmile teeth whitening tubes, and it says to finish all the liquid until the tube is empty. i do that, but there are still crystals on the sides that i cant seem to get out. is this normal?When u are done using the gosmile teeth whitening tubes, does all the liquid finish and crystals stuck onsides
www.google.com has a great deal of information that you could use to find your answers , while yahoo answer is more likely to be better for people's opinions.. thanks.
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