I think this post was made already.....
In all honesty, and please don't be offended, its a really silly thing to ask. Something as superficial as your braces will effect your fun. This more than likely steams from an insecurity you have about your looks and it will only ruin your time if you *let* it ruin your time.
No. 1 Cosplay Mantra: Make it Work. Make it work,make it work, make it work!
"If I had known I was destined for a premature demise.... I would have eaten more butter."