Why do gold teeth cause halitosis and leave a bad taste in your mouth?

False premise in the question's assumption: Gold used in dental restoration, also known as gold fillings, crowns, or inlays, does not contribute to halitosis (bad breath), and it should not leave a bad taste in your mouth. Gold is an inert material, resistant to corrosion and discoloration, used in dentistry specifically because of its stability and biocompatibility.