Any chance he suffered a profound trauma being under surgery? I imagine an utter fear of surgery and this could have been triggered by something really insignificant like a small tingling or just the thought of surgery, of a foreign element cutting deep in your tooth canal. That, amplified over and over (he might even have lost conscience if his jaw was being held in place by a device -- the doctor wouldn't have known it this way) could have given birth of some kind of mechanism of memory wipe, sort of like the one victims of rape or horrible accidents develop as a self defence mechanism to (not?) cope with what just happened. Only in this case it went terribly wrong.
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