As mentioned, there are a variety of prescription rinses, otc products to help with dry mouth, home remedies, and pain meds on the pain ladder scale. Also common is thrush, a fungal nfection, and or a bacterial, viral infection that needs to be treated with appropriate meds, that can contribute to pain, difficulty eating swallowing. If left untreated, theyncan go septic through the mouth ulcers, esophagus, stomach, into the blood, and difficult to treat. I would tell the dr of anything unusual. Good luck with treatment.