Hi,
I had BMS symptoms for over 5 years. It started with sensitivity to spicy food, mainly hot sauce. It got to the point that toothpaste and sodas would burn my cheeks and tongue.
Mouthwash felt like I was gargling with acid. The inside of my mouth was also very sensitive to toast or chips, i.e. anything sharp felt like it was cutting the skin.
It was suggested that I might have food allergies so one at a time I systematically removed foods from my diet. Nothing helped.
Finally, I realized I had never given up chewing gum. Bingo!
The pain went away in a week. I have retested to be sure and it is the gum. Extra sugarless gum; contains sorbitol, manitol, and some red dye. Not sure which is the culprit.
Hope this helps someone,
Steve