12 Packets of CB12 Boost Gum. CB12 Boost Gum 10's is the ideal solution to unwanted and embarrassing cases of bad breath. This two-layer sugar-free chewing gum is packed full of zinc to prevent bad breath, sodium fluoride to strengthen and support teeth, as well as xylitol that helps reduce plaque. This prevents halitosis and promises to breathe a lovely freshness into your breath. CB12 gives you a much-needed boost, ideal after meals to give you the confidence to tackle the day head on.