I received the goods but there are no instructions. I've tried other whitening systems in the past, each with different instructions. I gave 3 stars to be fair. I will try different app metrics, wasting the product and not getting the full benefit of its goal. For the company that supplies this product, your negative feedback may be due to your failure to provide pros and cons and general information including how to apply. I also looked through the Revain list and couldn't find anything.
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