Hi James, I've moved your thread into the ketosis section as the bad breath is a sign of ketosis. I have tagged you into a helpful thread on ketosis that you may be interested in.

Basically your breath means you have well and truly entered ketosis, the symptoms are worst in the early weeks as your body wastes more ketones. Once adapted these symptoms should be less of an issue.

Making sure to keep hydrated should help as it will help to dilute those wasted ketones in your breath and urine, also parsley is meant to be good for freshening breath.

Make sure you are drinking plenty of water. That can help.

My wife and kids never complain about my breath but I do notice a bad taste in my mouth sometimes when I'm doing low carb. Often it's as much about my mouth being too dry as anything.