PURCHASED TOOTH WHITENING GEL AS ON OFFER. ASKED IF IT WOULD KEEP AS DIDN'T NEED IT FOR A WHILE AS STILL HAD 1 TUBE LEFT FROM PREVIOUS BATCH. WAS TOLD YES IT WILL KEEP IF KEPT IN FRIDGE (WHICH I DID) WHEN I USED IT, IT DIDN'T WORK SO TOOK IT BACK FOR EXCHANGE. THEY REFUSED TO EXCHANGE SAYING I'D HAD IT TOO LONG. I KNOW IT WAS JUST OVER 2YRS BUT AS YOU DON'T NEED TO USE IT VERY OFTEN SAY EVERY 6 MONTHS & IN MY CASE 9MONTHS. THE PACK CONTAINED 6 TUBES SO EVEN IF USED STRAIGHT AWAY IT WOULDN'T WORK BY THE TIME YOU... read full review »