I've never had a toothache that lasted for more than a day before -- I noticed this one last night and it's still here. I have TMJD and I noticed that when I clench my jaw (the cause of the TMJD) I put a lot of pressure on this tooth (it's a ... bicuspid? I think?)... so is it pressure, or a cavity???I've NEVER had a cavity. And I don't have insurance. What do I do?