Hmm that's a bit strange. My brother has a special mouth wash that really helps with his. He is supposed to use it after every meal, but he only does it after breakfast & dinner when he's home. It really has helped him, he still can't really eat acidic foods though.

There is a thread here about it as well.


ETA: I can find out the name of the mouthwash when I see him tonight if you like?