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Salt Water Mouth Rinse. Rinsing your mouth several times daily with a simple salt water solution helps keep the area clean and might provide temporary pain relief caused by tongue ulcers. Mix one-half teaspoon of salt in a cup of warm water. If the solution stings too much, dilute it with more warm water.
I discovered this in Germany years ago. They sell a homeopathic med for sore/swollen throats that is a pineapple extract-little round drops you melt on your tongue. You can drink the juice, but there's a lot of sugar in that. If you can find the extract that's even better.