Most tutorials about Tunisian crochet tells you to go with a larger hook then you would for normal crochet, at least one or two sizes larger is often suggested.
One of the reasons for this is that it is supposedly going to help combat the curling many Tunisian crochet stitches is prone to.
When I first started out with Tunisian crochet a few months ago, I did listen to the advice and went with a larger hook then it said on the yarn label, figuring it was what it had to be since everyone said so.
The produced fabric still curled and my edges, especially the right side was not really neat.
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