For people who get canker sore alot, this is an old recipe for a mouthwash that helps relieve and remove canker sores. One of the ingredients may be a little hard to find, but if you search online, or ask your local herb store they should be able to get it for you.
1 oz Sage
1 oz sumac berries
1 oz Gold Thread (this one might be hard to find, but it is an herb, DO NOT USE IF PREGNANT)
1 1/2 pints water
Boil sumac berries and gold thread in the water for 30 minutes, add sage and then simmer for another 15 minutes. Remember that this is a mouthwash, use no more than twice a day and do not drink.
This can also be used topically for scratches, scrapes, wounds, bites and stings.