No, on SS it's packs, black tea or coffee and water only. No mints no chewing gum no nothing. Even some medicine can kick you out of ketosis.
For breath....I carry round a spare toothbrush and toothpaste, and primark do breath sprays for 60p. I also find that the more water I drink, the less my breath smells.
Current loss: 12lbs and 7.5inches