I don't believe in any diet that can "cure" bad breath, maybe Body Odor . Ok if you stop drinking milk and eat diary products you will probably have BETTER breath but that's not the source of it. I think many of us suffer from post-nasal drip, candida, hormonal changes or just bacterial overgrowth (a cause by post-nasal drip for example) or any other undiscovered illness.
See a professionalist and talk to him/her and try to really figure out what's the source of it, at least I am going to do in the next two weeks.