Hi,
I went for this surgery in Feb 2003 after wearing braces for about 8 months. After the surgery, you need to keep wearing braces for another 6-12 months, before u switch to retainers.
you are not able to brush your teeth for the first week after operation. In fact, you can't open your mouth, as your upper and lower jaws will be tied together. you have to take a special kind of milk using straw. imagine drinking milk for a week. i can still remember the taste...
after 1-2 weeks, u are able to switch to soft diet, eg. porridge, nestum, cereal. probably after 3-4 weeks, you can take solid food, but not too hard. it all depends on how fast u recover. my doc said i'm quite fast. btw, there will be a huge swelling of your cheeks after op. u will be given 3 weeks of MC.
u can refer to internet for some info. i even saw 1 page with photos of the op itself.