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Title: BURNED MY GUMS!
Review: The first two-three days were fine but day four, the trays burned my gums white and in one spot, brown! It hurts. Plus, the whitening isn't as a great as Crest. The trays also aren't large enough for long teeth and they don't whiten the backs of teeth; only the front. Coloring on the back of teeth and affect the color seen by people when you smile.
