I have had it for years. I went to a University Dental Clinic for a biopsy diagnosis and treatment. I got it under control and finally remission using primarily Fluocinonide in mouth trays, or Dexamethasone mouth rinse if really bad, and nystatin mouth rinse to prevent a yeast infection in my mouth from using a steroid (Dexamethasone). A knowledgeable dentist is important when you first start treating it. Many dentists aren’t.