I always get canker sores when stressed/when my immune system isn't super awesome, so it doesn't really shock me that I'm getting them now. One just healed and another is starting to form. Noooooo! Stahp!

(
And of course anbesol is Category C.
I've used it sparingly when I could no longer take the pain. Mostly, I'm used to canker sores. Sigh.
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Re: Canker Sores, Anyone?
Married: Oct 20, 2013
BFP 1: Aug 31, 2015
EDD 1: May 12, 2016
DD1 Emma born May 12, 2016
An Honest Account of New Motherhood (with Postpartum Anxiety, Depression, and OCD)
BFP 2: October 07, 2019
EDD 2: June 20, 2020
I have found that rinsing my mouth twice per day with a hydrogen peroxide rinse really helps. Get the 3% hydrogen peroxide a pharmacy, mix with water and swish for a few mins. Just don't swallow! It seems to help them heal faster. You can also use salt water but it burns.
ETA: I only do the rinse when I have the canker sores, not every day. I've also heard that B vitamins can help.
I haven't got one since I got my BFP, but I usually hold luke warm tea bags on them - it was my grandmothers remedy and I do feel like it eases some of the pain. I also read once to soak a cotton ball in apple cider vinegar and hold it on for a minute (or however long you can stand it - it hurts like a @$;&!). It ends up numbing it for a while and they always seem to heal within a day or two of doing that so I feel like it speeds up the process.
Good luck! Fx they get better quick!
It's tastes a little bad, but it makes them go away so fast!
It's not a medication, but obviously I would still confirm with your doctor that it's okay to use.