Others have touched on what causes them but as a long time sufferer of them I recently discovered mouth ulcer patches on a trip which stick to the ulcer and coat it with medication whilst protecting it from your teeth and soft food (hard food will rip it off very painfully I discovered).
I had the worst breakout I’ve ever had on this trip and I think at one point I had 8 ulcers. It was so painful and every time I healed one with salt and water or whatever, another 2 would appear.
I discovered these patches in a local drug store, put a patch on each one overnight (the ones at the back of my throat were difficult) and in the morning they had almost all entirely healed. Did it once more and they were all gone and I could enjoy my trip.
I went back to the drug store and bought 25 boxes because the only solutions in my country are numbing agents or saltwater. They’ve worked every time since.
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