My thoroughbred mare was seriously accident prone too. In the first month or so of owning her she managed to puncture her hind leg to the bone, and got a huge infection, fortunately the bone didn't get infected, then she punctured her 3 other legs once each on different dates, then she punctured a hole in her hip trying to get away from her neighbor while walking into her stall, and her last big injury before I sold her was her torn superficial flexor tendon, which occured right after she healed from a pulled tendon in her knee. Plus a couple pulled shoes, with scrapes on her heel bulbs, and many other minor scrapes and cuts. I owned her for 3 years, and it was always something when I went out to see her. Finally got to the point where my vet would tell me what to do over the phone, and only come out if whatever it was wasn't healing a week later. I got real good at making pressure wraps on the legs, and hiding bute in food lol. She was an awesome horse, but we had to spend a small fortune in vet and chiropractic bills while we owned her. Hopefully your horse's jaw heals just fine.