Just as above really 
We're waiting for an orthodontic referral but in all likelihood it will be braces. This clearly won't affect his guitar playing but he is also grade4 oboe which will be slightly more problematic.
I've read that he may need a softer reed than he's used to, but at grade 4 will that be possible? (I vividly remember the months with the very soft beginners reed. Our dogs used to howl in time with him 
Anything else I should be aware of? He's fretting a bit and I want to be able to reassure him, but at the same time be realistic in what I'm telling him.