Do you Americans not get Teetree oil over there? I suppose it would be similiar to Clove Oil.. but have had Teetree to treat an absessed tooth before.. did the trick. Best mouthwash is warm/hot salt water, or Vodka is good too.
There's bound to be a free dental training school around. You want to get some Amilloxillan 500mg anti-biotics, 5 day course to fight the infection. Garlic will help too.. but not if the infection gets into your blood-stream.. that's very dangerous, can give you Sentsi?? (no idea how to spell it!?), but it's dangerous if not sorted out. Cannabis is a fantastic pain killer too, the best of all painkillers apart from morphine & ketamine. Just make do with 2 paracetemol then..

Dentist fucked up my tooth, only pulled half of it out, left the root in, so got to get that removed soon, but luckily I don't have to pay for it. Our free dental service is quickly on the way out, so have got all my tooth work done while I'm on benefits, otherwise we pay towards treatment.. if working.