Michelle,
I would guess that also depends on the type of surgery you had. If you "just" have a small portion cut out it does not take that long to heal, on the other hand if there is a larger area involved or you have an allograft it will take longer. In my case there were 6 weeks between operation and radiation. The only thing that happened in that time was dental evaluation + cavity but no extraction.
One thing you may want to explore is hyperbaric oxygen treatment. It is probably to late for that now (you also need 20+ treatments), but you could do it some time after radiation. This is supposed to help healing and help prevent radioosteonecrosis. You may have to fight with your insurance. I am doing this now 3 dives done 27 to go....

Aggressive is not always bad as long as it is local, it can also mean that it will respond well to treatment. After I had surgery my SCC came back with a vengeance (it was visible). So you can guess what I did .. me and my flashlight. In any case after just a few rads you could see the crap shrivel up!!
I see that you have weekly cisplatin treatments. The dose is lower that for the usual 3x treatment but you may still get ringing and permanent ear damage. Be prepared, IF there are problems they may want to switch to carboplatin.


Best
M