Bad breath from detox is not common, however, Halitosis can occur in some when there is a change in diet- whether that be positive dietary changes or negative ones. The increased consumption of fibre and fresh produce, or even just the removal of other foods that may have been regularly consumed, causes an alteration to our gut microbiome, which presents in some through their breath. This is something we would anticipate to balance out as your body settles into the detox