How do you get rid of a canker sore on your gum?

Go to the drug store and get a tube of Orabase with Benzocaine (you no longer need a prescription) Place a small amount on a q-tip and dab , not rub, it onto the sore. Do this after eating and before bedtime. The benzocaine will numb the pain and the orabase will protect and help prevent infection. Good luck