I have extremely sensitive teeth and gums. I used a regular Crest Whitening Strip once and was in excruciating pain all day. I tried soft whitening strips for a year, 2 boxes and it caused 2 white spots and that was it and it still gave me a bit of gum pain. I've seen bleach pencils before but thought it was just a gimmick but this is the real deal! My teeth are whiter after 1 application! I'm telling you, it will whiten your teeth! There is nothing wrong with this product. No bad taste (tastes a bit like mint at first but that's it), DOESN'T KEEP MY TEETH OR TEETH SOOTHED, I don't get nauseous or anything after using it. This is a really great product at such a fair price! They even send you 2 pens! I've only been using it twice a day for a week and a half, and here are my results! Top photo before, second photo after! My pen that I used is still half full and I have another pen!
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