It is very common for people to get their wisdom teeth taken out before going to basic training. And there's no issues with the academy. They actually prefer you get it done before coming. 1) No chance of you having an issue with your teeth when you get to the academy; and 2) the government doesn't have to pay for it. Getting wisdom teeth taken out before going to BCT is common.
If you don't: Basically; hope that the teeth make it through bct. If it flairs up and becomes a problem during bct, expect to be sent home. You can only miss so many hours of BCT before you fall too far behind your classmates. Then, the academy has no choice but to release you and send you home. So; if the wisdom teeth aren't causing a problem, don't worry about it. But the FACT that your dentist told you last summer to get them out, tells me that your dentist thinks they could be an issue. I suggest you get them out immediately. Getting them done before april 15th gives your son plenty of time to recuperate and go to BCT without issues. The longer you wait, the less chance of that being true. Yes, report it on your medical form. But like I said; this is common for many appointees; and the academy actually encourages it and prefers it.