Hippy Gal
I found an article about "KetoBreath" on a website. It mentioned that part of the problem was the protein ratio in the diet. I don't believe everything that I read but it doesn't hurt to try so I lowered by protein intake and my mouth is a lot better. Before it was so bad I didn't even want to eat. The nasty taste killed my appetite.

Try checking this out. Here is the page about Keto Breath:
http://www.geocities.com/jenny_the_bean/ketobreath.htm