Some that I can buy at a local drug store like Crest or Listerine. Also tell me if you know any that don't work well, so I can stay clear of those. Thanks!
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i like the rite-aide brand. they all have the same strength of whitening gel, but the rite-aide brand feels sturdy, and doesn't slide off of my teeth like th crest kind does. also you can wear them longer because of how sturdy they are. i bleach my teeth using dental office strength bleach, and i leave my trays in for two hours. they get really sensitive, but you get results right away.
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