Hi Trymester,
Try an over-the-counter product called Gly-Oxide. A lot of dentists recommend it and I've used it for canker sores and dental -procedure gum soreness for very quick healing.
It's a combo of hydrogen peroxide and carbamide peroxide with glycerin which makes the hydrogen peroxide more stable, therefore it prolongs the antiseptic action of the peroxide.
It's used for canker sores and minor mouth wounds or gum inflammation. Some folks use it every day, routinely, along with brushing, to simply improve their oral hygiene. You just put about 10 droplets from the squeeze bottle on your tongue and swish it around with your own saliva for about 2 minutes.
Doesn't exactly taste like your favorite milkshake but hey- it works.
Great stuff. I just used it for a few days for a canker sore on the side of my tongue. All gone now, yay!
zuzu