Cardamom seeds have an aromatic, sweet flavour and can be used to sweeten your breath. It is used extensively in traditional medicine to combat bad breath and helps in treating various dental issues. Cardamom is used to treat bad breath, because cardamom is able to kill common mouth bacteria and prevent cavities. You can chew cardamom seeds or whole cardamoms after meals as a mouth freshener. Also, the oil from cardamom seeds may be able to kill bacteria and fungi.