The last few weeks of my new job have been a mixed bag of lapsing into eating dairy and gluten packed food and being strict on my diet.
The worst thing is when my location and schedule changes. I have to find new places to eat, try and fail until I find the right balance.
So stress + diet instability + dairy + gluten = mouth sores or ulcers. For those who have not had the distinct pleasure of a mouth ulcer - they are little open sores in your mouth caused by (normally) an excess of acidity in your saliva. And they hurt like hell!
If you want to get rid of them quickly, there are a number of creams and covers which either sting like an angry bee stuck in your gums or get stuck to everything in your mouth except the actual ulcer. If you have a high pain thresh-hold you can try rubbing salt into the ulcers and then dancing around in total pain (but if you can keep it up, you ulcers might heal slightly faster).
Adding some extra Vitamin-C to your diet may help as well, but I haven't seen anything conclusive about this one. (Most claims seem to originate from the ulcers being linked to a cold and Vitamin-C helps build up your immune system, so must therefore help ulcers)... But that is an obvious stretch of correlations.
So in the end, we really only have one choice in fighting mouth ulcers - try really hard not to get them in the first place. And if you do - balance your diet, keep your mouth clean and choose whether you want a bee, da-pain-dance, or a sticky mouth. You will likely end up with a little bit of it all (I always do)...