Salt and Baking Soda cured my canker sore in mouth in three days! I had never had one before. I came here and saw the many remedies. I first tried the aspirin and actually it irritated the sore and the surrounding tissue in my mouth. I read about salt and baking soda. I started Wednesday night rinsing my mouth with the warm to borderline hot salt water (about a tablespoon of salt with about 6 oz of water) this will burn/painful at first. I swished around in mouth until all was gone. When I woke up I saw that the epithelial tissue almost like a scalb had formed over the sore in my mouth. Though still painfull, I repeated the same thing accept this time I used baking soda. Same amount as I used with the salt. I used baking soda twice and salt once during the course of the day. About every 3 1/2 hours. The soreness begin to go away.I repeated same thing on Friday. By Sat afternoon the soft tissue scalb was completed detached from sore and the sore was healed! Amazing!