Biotine mouthwash! Also, their mouth moisurizing gel is wonderful. Biotine rocks.
The mouthwash alchohol-free, and actually makes you feel like the ulcers are being cleansed and allowed to start healing. When I have pain from excessive dry mouth, or ulcers, I'll use it up to 4-5 times a day, and it's amazing the difference it makes.
Doing a "gargle" with sesame oil is helpful too, but not for when you have open sores in the mouth. it's just good to help maintain the overall health of gums and teeth, esp. with dry mouth, and has helped me to prevent the return of more ulcers. (Look up "oil pulling" or something like that in ayurvedic medicine websites.....)
Also, Salagen has helped my dry mouth a lot. (I'm not sure if that's a factor for you - the the Biotine mouthwash will help regardless.....)
Hope some of this helps. Good luck! I hate when my mouth hurts, of all things!
Diagnosed: Sjogren's '94, Raynauds 2000, Vasculitis 2002, Lupus SLE 2004, Lupus Nephritis 2007 - progressive w/ "diffuse proliferative lesions", controlled, and what looks like Discoid coming and going.
LUPUS: Cellcept 2,500 mg, Chloroquine 250 mg, Methylprednisolone 16 mg. BP: Spironolactone HTZ 25/25, Metropolol 100, Cozar 100, Nexium, Salagen. Vitamins/Minerals: Multi, Calcium, D, Iron