I used many different things for the big sore on my tongue. Nothing would work, until I started to use the clove powder.. It started to work immediately.
I've learned that canker sore can be caused by bacteria or many other causes. In my case, it was bacterial, from a tooth infection. In 2 days it shrunk 80%..another 2 days later it was gone.
I tried some oregano oil (oregano essential oil in olive) and it seemed to have an immediate effect, taking away the pain (and tasting nice). The stuff is quite expensive though and I had also read about clove oil being recommended. Furthermore clove oil has an even higher antioxidant value than oregano oil! So I mixed some olive oil, a bit of grapeseed oil and clove oil and a bit of thyme myself (- about 7ml carrier oils, plus about 30drops of clove, plus 10 drops of thyme). Just as the oregano oil this mix took away the pain quickly and seemed to stick to my tongue nicely, so the analgesic effect lasted through eating. This was on day 4.5 of the sores though and they still took another 2 days to heal off to a stage where I could eat without applying oil before... (N.B. - make sure you do not use essential oils neat on skin or mucous membranes, as they can 'burn' them. I.e. most essential oils need to be diluted in a carrier oil)
Cloves also worked for me, at least in eliminating the pain. I got one whole and chewed it, alleviated for a while (half an hour or more). I don't get ulcers that often, so I can't judge if it helped speed the healing, but it definitely helped the pain! Ginger also has the same effect :)
CURE FOR CANKER SORES: Hi i try many remedies but the best i try was ground cloves. Use your finger or q/tip take a small amount and put it in your mouth where is the canker sore is, hold it for 5 minutes, it will sting little bit , then wash your mouth with plain water.it will heel about 4 to 6 hours. I never see anything like this happen with me or my friends, try it and you will see, By the way thanks for this site i recommend it to everyone i know. Thank you.