Wow! I never heard of that, I've been on Lamictal for about 3yrs now, haven't noticed any change in breath, unless I do not floss and brush my teeth, flossing help get that stuff out between your teeth, if not done a couple of days and when you do it, man oh man, it wreaks! Imagine what it is doing to the teeth.
I think a sugar free gum or candy will help reduce this dry mouth and bad breath thing.
BTW
Your doc has you take mini vacations from your meds? Wow, mine never tells me to do that

Take care now,
DE