This is the really difficult part about "medicine" in China. The interpreter. FAO's, students, etc, down to my own medical students, don't always know the words for whatever the dentist or doctor tells them, so they don't tell you. The dentist may have given instructions, which went untranslated, or possibly he/she thought you'd magically pluck a dosage out of thin air. Either is possible. Still, a hole open to the root of a tooth is an abcess until proven otherwise, expecially with the pain you are in. You will not get better until the abcess is cleaned out, and they can't work on it until the infection is gone. Unless, of course, you'd like them to cut through pus to get to the problem and start you a raging blood infection.
So, send me a PM if you want my creds, but ask the FAO to call the dentist tomorrow and get the details for the antibiotics; who, where, how many, how often, etc. I'll be online after my 8-9:40 am medical review class if you want an opinion on what they tell you, and then you can kill the bacteria.
Ask Raoul, he'll vouch.