I don't have a lot to add that hasn't already been said other than to reiterate that cutting all hair with a razor is a really bad idea. Fine or bleached hair should not be cut with a razor unless you are looking for fuzzy ends. You wouldn't even groom every dog with the same implement so why would that be a good idea for human hair? Find a stylist who knows what is best to use on your hair AFTER looking at it, not before. :-)
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