My DS (PA & TNA) goes through periods when he deals with this.  What gives him some relief is to dip his finger into baking soda and hold it on the sore for a bit.  His sores are usually on his tongue.

Mix equal amounts of liquid benedryl and maalox and swish and spit.

Since I was a child I would use peroxide, and it's worked like a charm. Depending on the age of your child though, this may not work. You have to be absolutely sure not to swallow it. And you rinse after.

I remember getting one as a college student in Italy. Buying peroxide was so hard. It's behind the counter there (or was then) and I basically pantomimed at each pharmacia until one pharmacist got it, wrote down the chemical name for it and I had an epiphany. It is perrosido or something like that.

When I do not use toothpaste containing peroxide I get them very easily. You could start out by judging Arm & Hammer toothpaste. (PA DS doesn't have a problem with it).

I don't normally use anything, but have used Orajel safely in the past.  I've found that usually the pain peaks just before it gets better.  Hopefully tomorrow it will feel almost normal!

I do this one if it's really bothering me:


Rinse your mouth with salt water. To make a salt water rinse, dissolve 1 tsp (5 g) of salt in 1 cup (250 mL) of warm water.



Otherwise I try to say away from acidic foods or anything that's particularly crumbly that will get in there and irritate it.

My peanut allergic daughter has a canker sore inside her mouth.  Any ideas on a medicine or safe treatment for it?  It is really hurting her today.

Thanks!

Paula