Plum juice Take two tablespoons of fresh plum juice and use it as a mouth rinse for several minutes. For a bad sore soak a cotton ball in plum juice and use it as a compress for a few minutes. At the first sign of a canker sore, gargle with a mixture of 1 teaspoon soda and a pinch of salt in 1 cup of warm water. It should ease the pain quickly and speed healing. Sorrel has astringent and antiseptic properties and has long been used for various skin ailments.
Tea Try using a used tea bag on the canker.
Press it on the sore like a wad of chewing tobacco and hold it there as long as you can. The tannic acid in the tea will aid healing. This oil is derived from the leaves of the native Australian Melaleuca alternifolia tree, and contains antiseptic compounds that are a very effective skin disinfectant. Water, salt Salt water is another remedy you can use. Mix 2 tablespoons of salt in a 6 ounce glass of warm water and use as a mouth rinse 3-4 times a day.