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I have used many whitening products before and I had high expectations for Aquafresh White Trays. I was extremely dissatisfied with the product and saw no visible change after 3 uses (although the box states results in only 3 uses). They left my gums BLEACHED and burned. Unless you want to swallow chunks of the gel that are in your mouth you can't talk or swallow for 45 minutes. I did not see very visible results and I was very unimpressed with the product.