I was a severe bulimic for more than a decade (have not done it for many years now) and my teeth are ruined. I have lost many teeth and need to wear a dental bridge, and I don't know how long the remaining ones will hang in there for. All of them have either had a root canal or have had several cavities filled. Currently I have one tooth that I know is simply going to fall apart one day... it is riddled with cavities that I can't afford to get fixed. At least it has stopped hurting now. I know I will have to get full dentures at some point in the not too distant future.

That is what bulimia does to teeth.