I would wait on the interview until you are fully adjusted to the ibraces. However I know A LOT of people that were used to them after 24 hours... there are some cases on this site in which people take some getting used to them, but I think it is rare...
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Good luck and lets see some pictures of those babies
Braced Twice. Wear Your Retainers!
Ceramic Braces On Top and Metal Braces On Bottom, Palatal Expander - First Time Around
Metal braces top and bottom - Second Time
Now Wearing Retainers At Night!