tablespoon of cider vinegar, 3 times daily, if it hursts like hell add a teaspoon of lemon to 1 teaspon of honey, hold under tongure for 60 seconds 4 times daily. Do it for 3 days, no relief, get it looked at.
Nothing works. I've been getting these for 30 years to the point where I can't eat or talk. I've tried everything (minus the probiotics mentioned). The more expensive Bonjella that forms a film over ulcers offers minor relief but won't cure them.