I had ot for 15 years!
Stop drinking soda!! Coke, Pepsi, etc.. drink only cold water with ice cubes. Rinse your mouth with very warm water 3 times a day for at least 5 minutes. Brush your teeth with baking soda. Take a multi vitamin to ensure you get all the B vitamins.
You should see a change in 4 days!
If not, ensure no other acid drinks are in your diet. Coffee is also acidic, I don't drink it, and I'm sure it's not easy to refrain or stop. But try.
After that if you have a fissure toungue as well you will see slow filling in of them.
I don't know yet if I can ever go back to acidic drinks yet, and I'm avoiding alcohol right now, but that's hard as well!
Good luck!!!!