Check into acid reflux aka GERD that could be a big part of your problem. I was to the point where eating a room temperature banana in mid summer was too cold

Check into acid reflux aka GERD that could be a big part of your problem. I was to the point where eating a room temperature banana in mid summer was too cold for my teeth. My dentist figured out it was the acid I was coughing up getting on my teeth. I also grind my teeth but that's more mechanical the acid affects all surfaces of my teeth. Sensodyne toothpaste or similar helps a bit if I remember to not rinse it off.