I would hate to get toothache while in space, or earache even, or even a paper cut!
But you're not going to be going up there if there is any sign of tooth decay.
NASA astronaut Mike Fincke has handed command of the ISS to Roscosmos cosmonaut Sergey Kud-Sverchkov as Fincke and the rest of Crew-11 are scheduled to head back to Earth on Wednesday. The departure is more than a month earlier than planned and comes after NASA's decision to end the Crew-11 mission due to a medical concern …
Dr Kevin Fong did the UK's 'Royal Institution Christmas Lectures' one year on space medicine. The ISS has minimal medical facilities as firstly, astronauts and cosmonauts are really super healthy people, and all the medical equipment would have to be blasted into orbit in competition with scientific experiments. They are also super careful about avoiding injuries etc, so hope there are no serious medical emergencies up there. But sadly, they cannot cater for every eventuality.
https://www.rigb.org/about-how-survive-space
They quarantine for 2 weeks before launch. And that's assuming no delays. So there's a pretty low risk of infectious disease. Unless the Jehovah's Witnesses and door-to-door salesmen are really determined. That leaves long-term health problems and injuries - and they're a healthy lot in a very controlled environment, with lots of medical monitoring. Which, I guess, is why this is so rare - it's the first time I can remember it happening.
I guess even when you're an astronaut, you can get a phone consultation easily, but actually getting to see your doctor takes ages...