I used to suffer terribly with mouth ulcers – my mouth is properly scarred.
They used to prescribe Oracort in the UK but stopped a few years ago in favour of the steroid mouthwash. I continued to buy Oracort from an online New Zealand pharmacy. It’s the only thing that would stay in place and fix them.
However, you are just masking a symptom…..
I asked the doctor for a coeliac blood test as ulcers are one of the symptoms. They weren’t confident as I had no bowel symptoms.
It came back positive. So I went 100% gluten free (and was much better).
They also biopsied my ulcers and found granuloma indicative of crohns.
However I still had bad times with ulcers and fatigue. They put cameras in every orifice.
Anyway I have ended up on azithioprine and am much much much better.