Hello Phyre!! I'm Brigitte! I can't help but to chime in on this topic! I've been getting mouth sores, mostly on my tongue since high school (I'm now 36) doctors don't know what it is and the dentist called it a geographic tongue; but I've done some research and geographic tongue is not painful. My tongue is terribly painful, probably 80% of my life. I think I'm going to try vitamin c and see what happens!!!! It would be amazing if it worked! Some days my tongue hurts do bad I can barely talk or eat! I wish I could post a picture if it on here to dhow you what it does. It's very strange. So does vitamin c clear up the mouth sores completely for you?