If the dentist or orthodontist thinks its a good idea, have him use the "brush for 60 seconds before bed" fluoride stuff. I used it for the last year or so before my braces came off (I had them from 2nd through 7th grade, so it took a while for me to really care enough about my appearance to get on board) and while I was still having old braces adhesive popping up at dentist visits into my 20s, I never had the terrible lines across my teeth that they warned me to avoid.
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compared to his previous dental work, braces will be a cake walk! i hope all goes well!
p.s. have him take ibuprophen BEFORE the ortho!
Good luck with the braces!