Hey Austin, I forgot you joined this forum! I won't pretend to be a particularly skilled healer, and I can't recommend any techniques that I have personally tried, but I can give some tips specifically for getting rid of canker sores. Those buggers are often caused by stress, so as much as you want a quick and easy fix, it could be really helpful just to find a quiet place, sit down, and meditate or just relax for 20~30 minutes. If it's causing pain, try using one of the following techniques from Karen to minimize that:
Relax your mind and clear your mind. Now, close your eyes. You don't have to, but in my experience it makes it easier to focus. With your mind, go straight to where the pain is. Focus on the pain, where it is, how intense it is, and if it is spreading to other parts of your body. Mentally wipe out all the pain by imaging the pain suddenly not exists anymore. What you are really doing is finding and controlling the nerves in your mouth and shutting them off. You should feel the pain suddenly disappear. Remember you are getting rid of the pain, not the sore. Don't try to numb the sore, just go for the pain. If the pain returns, no problem, just do it again.
To psionically take away the pain from a wound, you first want to calm the mind and breathe in and out slowly to settle the body. You will need to relax your tightly defensive mind so you can open your self up to the flow of psi that is in and around you. You will find this hard seeing how pain it a hard distraction to ignore. Still, with a strong will and discipline, this can be achieved. The next thing you will want to do is to gather psi from and outside of your body and concentrate the energy where the pain is located. This might increase the pain. Do not let go of your grip on psi. Accept the pain and then will psi to carry the pain away. Imagine if you will the pain being this angry red glow and psi being a blue calming flowing river. Direct the blue river to the red and then sweep away the red from the area and to away from the body.
Now leave the wound alone. Once you touch it or have something brush up on the wound or area of pain, the pain will come back and you will have to start all over again. So sit or lie down for a while. If the pain comes back, repeat the process again and look for infections. You may want to seek a doctor.
In my experience, the little things usually go away on their own within a week, but these methods should help you survive until then. (BTW, it would've been quicker just to call me! Lol, these forums aren't quite dead yet but they're definitely coughing up blood...)