Treatments for getting rid of canker sores on the tongue include utilization of vitamin E, black tea bags and a potassium chlorate and water mixture, according to The Doctors' Book of Home Remedies as discussed by Carol J. Mulvihill, RN,C. The treatments attempt to change the pH in the mouth.
Squeezing the oil out of a vitamin E capsule directly onto the canker sore several times a day is one of the recommended oral canker sore remedies mentioned in The Doctors' Book of Home Remedies. Applying a wet, black tea bag to the affected area is another self-help option. One teaspoon of potassium chlorate, a potassium compound that is sold in powder form, can also be dissolved into 1 cup of water and drunk several times per day to shrink the canker sore.