@jshdma I have OLP, but only since mid-December. It scares me to hear others here who have suffered this awful thing for such long periods.
It's so sad that you are a teacher trying to combat the effects of this. When mine first began, I could barely talk, eat, sleep. I saw several doctors and a dentist, with various diagnoses and prescription meds. and finally saw an ENT specialist who diagnosed OLP, and prescribed Clobetasol, which has helped a little. I've researched a lot and also use Curcumin capsules as well as applying CBD Oil directly on the lesions. These last two seem to work best, although still a long way to go. I've also had my dentist make a mouth guard, which is a big help to keep my teeth away from my painful tongue. I wear it mostly in the evenings and at night.

@jshdma please read about @orangealert’s post here dated October 20, 2020, and tip. It may help you. Also @johnbishop and @artist101 have posted that they used Arm&Hammer toothpaste. Thankfully mine is under control with Methotrexate (took four to six months to clear, though) but I sure can relate to your experience! You have my full sympathy!