Now matter how fit and healthy you are, at some point or another you will have to cope with being sick when bicycle touring around the world. It's not pleasant, no one wants it to happen, but it does. At home, everyone has their own ways of coping when they are ill, and this is quite often done in comfortable surroundings with perhaps family or friends nearby. A little moral support and someone to bring a hot drink when needed is a great thing to have, but a solo touring cyclist in the middle of nowhere doesn't have this luxury. You have to rely and look after yourself when you are out in the wilds, or even a foreign city for that matter, and a lot of it comes down to mental attitude.
My coping strategy – I've learned the hard way, and on longer trips now take a small emergency dental kit which includes temporary fillings. There are also gels available that can be rubbed on the gums to take the pain away. Other ways I have of coping, depending on where I am, how bad the toothache is and what sort it is include – Using dried cloves to dissolve over the tooth (don't chew them!), running cold water over the tooth every five minutes or so, and buying a bottle of vodka and swilling a mouthful around the tooth every ten minutes or so. It doesn't cure it, but after an hour I am too pissed to notice the pain!