Hi, from Georgia (Rep. of).
Here is the best and only remedy for canker sores in your mouth - dry Sage leaves. Chew just a few of them each time and all day long if you like and all year long if you like with no side effects. Don't use a dried stem of Sage to avoid scratches that can worsen situation and prolonged healing. You WILL get rid of canker sores from a few hours to several days in severe cases. Repeat treatment if any. Good luck!