Bad breath will only disappear when you have reduced or eliminated your toxemia, as this is symptomatic as to what is going on in your alimentary canal/digestive system.
Until then it is a constant symptom of the fast, and there is little you or anyone else can do about it, but it will gradually be reduced in severity as the fast progresses. It has been recorded that some fasters bad breath was so intense, that it was next to impossible to even stay in the same room as they.