I cracked one a couple years ago... it just sort of spilt in half, taking half the tooth with it of course...

anyway, I had slight muscle weakness in my bicep on the same side all year after that I tried everything, pumping iron at the gym, eating more protein, to no avail...

..had that one pulled... that is actually the tooth they tried to do a crown on that cost me so much more trouble, resins and crappy dental procedure stuff...

anyway everything cleared up completey real nice within several weeks of it being gone. I was already well into chelating by then so a lot of my system metals were already gone though.