Baking soda is an alkaline and will neutralize acids that irritate the canker sore; it also helps kill bacteria to help provide canker sore relief. For this canker sore remedy, try this home remedy: Rinse your mouth with a solution of 1 teaspoon baking soda in 1/2 cup of warm water.
Known as the “first-aid plant,” aloe vera gel can speed healing and offer soothing canker sore relief. Dry the canker sore area with a cotton swab, then slice an aloe leaf. With a clean spoon, dab a bit of the gel directly on the sore. Repeat as often as necessary. Aloe is also one of the most effective cold sore remedies.