were a complete disappointment to say the least. The trays were noted as being very annoying and difficult to keep in place for the lengthy 45 minutes that is recommended for a single treatment. After the 5th day results were only 2 shades better than to begin with not to mention the test subject's gums and teeth were too sensitive to continue the trial. I would not recommend this product to anyone who has sensitive teeth and gums or is looking for drastic whitening results. A big disappointment from a well-known company.
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