While I'm thinking about it...I wouldn't use the ship's blow dryer anyway. I had a friend who had the ship's blow dryer basically explode in his hand while he was using it. He had some pretty bad burns. It was on a different cruise line, but also owned by Carnival. The crew's response was to run up another dryer. Never mind the burns. Couldn't find the ship doctor anyway... "But here...have a money-off voucher for your next cruise." Oh sure. Like there's going to be a next cruise for him. An actual cash refund would have been more appropriate after the way they responded.
Anyway...after that long story - I just bring my own. I still cruise, and so does he. But I bring my own. And so does he.