Well, I tried the aspirin remedy, for a canker sore between my upper lip and gums... Cannot smile can barely talk. ALMOST cant even eat... I took off the rubberlike coating of the aspirin and shook out the powder then set it directly on the canker sore. VERY painful for a moment.... But its a good way to stop the pain of the ulcer :)
This does help immensely. I recently developed a mouth full of sores. Talk about pain. I'm still not sure what caused this because I never get them. I don't think it actually "cures" them, but it makes them feel better right away. I just let one dissolve in my mouth as close to the sore as possbile. No need to make a paste as aspirin dissolves very easily.