Ulcer On Gum What Is The Best Way To Get Rid Of A Canker/ulcer On Your Gum.?

What is the best way to get rid of a canker/ulcer on your gum.? - ulcer on gum

I have a very painful ulcer or sore that, in accordance with the gum bottom teeth. I had a little less than a week. I was wondering if anyone knows a good way to get rid of it. People who act quickly and inexpensively. Thank you to everyone who offered advice.