Works perfectly, no blue light required. They say you need it, look at my picture you don't need it. They give you a lot so you might think you have to take a lot, don't call it fu. bad taste. If you use too much, the bowls will overflow. IF YOU USE THIS WHILE YOU HAVE CAVITIES ON YOUR TEETH WHITENING, YOU WILL MAKE THEM WORSE! If you don't have tooth decay it's not bad for your teeth and it's the same active ingredient that my dentist sells. buy me
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