A treatment and prevention formulation for canker sores of the oral cavity including an aqueous alkaline solution having at least three B vitamins, zinc and iron mixed therein and administered to a target area by a spray container. The vitamins are B6, B9 and B12, but may include other vitamins as well. The formulation is all-natural, non-toxic and completely ingestible, so it may be used almost anywhere and at almost any time and can be swallowed after use.