I've been drinking diet coke all day (about 3 liters/day) for many years, which causes my teeth to be less than white and also rather sensitive. Besides the coloring, I suspect that the enamel is being thinned down by the citric/phosphoric acid. I have no chronic pain, but the cosmetic aspect and the sensitivity bothers me. TFA sounds like that treatment could help.

Any other recommendations for my situation? I can't brush agressively due to receding gums. I use a chlorhexidine solution regularly, which helps preventing inflammation/aphthae in the mouth, which I used to have quite often prior to discovering CHX. And no, dialing down the diet coke is unfortunately not possible for me. ;)