I had a very similar ear/jaw/same tooth as you describe pain last year for almost 8 months. They first thought it was TMJ and being that your pain is right in front of the ear, that makes me think that about you as well. Mine was inside the ear, though, like an earache.

My tooth in question was a tooth that had been root canaled for 19 years. Eventually I did get it extracted and I can say that the ear pain did eventually go away. I still am not totally convinced what the connection was, neither do the dentists. But I wonder if it could have irritated the trigeminal nerve.

As someone who has had multiple dental issues that no one could figure out, I can say that most likely, no one will ever give you a diagnosis unless something shows up on xray. Otherwise they just tell you to either live with it or extract it. It's unfortunate, but dentistry is just not very advanced.