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I have a bleaching tray that you can't see. I put gel in it and do experience sensitivity. The CREST product may be really strong it tingles bexause it's penetrating...I keep my tray on for hours. I can do anything except eat. I'll start getting a tingle in the lower-uncovered teeth that's when I take it out.
I have a slight root exposure from years of brushing too hard. That's the main source of the pain. That area also discolors easily with tea, coffee, wine tobacco etc. The tray bleached that area as well so the strips probably would too. Crest came to the ADA and asked them to promote it. Of course that would be a big no-no since it would be promoting CREST, but consider this, bleaching is a lucrative service of most dental practices.
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