This version of the 'flexfits' I bought has a manufacturing defect (but the 'regular' versions I've used are excellent). IF YOU ATTEMPT TO REMOVE THE WHITE FLEXFITS STRIP FROM THE SHEET, THE "GUARD" SHEET PULLS OFF ALONG WITH THE WHITE STRIP, EXACTLY DOUBLE AND FITTING ONTO THE WHITE STRIP. THIS CREATES AN INVISIBLE BARRIER SO THE WHITENING AGENTS CANNOT GET ONTO THE TEETH AND THE STRIP CANNOT BE PIELED FROM THE TEETH. NEW CUSTOMERS KNOW NOTHING ABOUT THIS INVISIBLE BARRIER. EVEN IF YOU NOTICE IT, IT IS ALMOST IMPOSSIBLE TO REMOVE WITHOUT DAMAGETING THE WHITE STRIP. This may explain the negative reviews that it's fake, doesn't stick to teeth, is too hard, doesn't work, etc.
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