text: what is the cause of a mouth ulcer?  any suggestions for remedy? i get them very rarely, and i used to know how to get rid of them.  is it salt water or baking soda or...i don't remember.  i haven't had one in years.  they always seem to show up in the crease where my lip meets my gums.  quite painful! by gargling your mouth with salt water, the mouth ulcers will heal quickly.  i found the homeremedies at http://aches.in/mouthulcer.html useful