That last one made me laugh a little
sorry
Don't think they look at your teeth at all, thats much more of a dentistry thing and it's more a cosmetic than a health issue. Noone is going to see your teeth when your are working apart from co-workers so don't see how that would be an issue.
This document would be good to look at if you have any other questions about the medical.
http://natscareers.co.uk/PDFs/NATS_A...lClearance.pdf