I too had burning mouth and tongue and tooth for almost 4 years. All the things my doctors and dentist tried are not really important. What’s important is what seems to help. I was finally diagnosed with gastritis w hyperplasia, reflux, and Barrett’s. I had silent reflux. Treatment with 40 mg ppi and sucralfate liquid, and baclofen and pepsid complete finally calmed my hot burning down where many hours I have no burning. It took a good 30 days of treatment before I noticed burning relief. After 60 days I was able to stop pregabalin and pain pills I took for the burning. It took patience to get here. I use a triangular lift pillow to keep my upper body elevated when I lay down, I do not sleep on my right side, I only drink water, I follow all food and drink exclusions listed on line for reflux, eat light meals and don’t eat after 5. I am not a drinker or smoker so did not have to stop. Life is better. Took an emergency room visit with the burning for a smart PA to lead me in the right direction-a gasterologist for esophagus testing.