I used a 14 strip pack (7 days) and they worked first time and I have never had to use them again. (As long as you brush, you can drink as much coke as you want, aslong as you always brush well. And in the unlikely event it gets yellowly again, another pack)
I have just ordered a 2nd box incase I need to use it in the future. Although I only used once, slight sensitivity (I had little sensodyne toothpastes in my pocket or bag, so I could put a dab on finger and rub on sensitive spot and its fine).
I buy mine here: http://cgi.ebay.co.uk/Crest-Whitestr...d=p3286.c0.m14



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