i had one come through when i was in croatia, awful pain, couldn't think, sleep, eat, but found that filling my mouth with water helped and so did taking dangerous amounts of pain killers (don't take dangerous amounts). i had to go to a dentist in croatia who didn't speak a word of english but he drilled it out, and it went, this was 2006 and it would flare up about once a year, be drilled out. earlier this year i decided enough was enough and (on the advice of my dentist) had it taken out. luckily it's at the back and not noticable but there was no way i was going through that pain again.