If your dentist said that you have a great dental hygiene then its not part of Bad breathing.You must try some home remedies such as Cardamom acts as a natural mouth freshener. Chewing cardamom is a good form of avoiding bad breath. Consumption of Apple cider vinegar, Gargle with a mixture of half a tablespoon of apple cider vinegar diluted with a glass of water. It protects against bad breath. Gargle in the mouth for at least 10 seconds.Its better to avoid any mouthwash containing alcohol, as it later causes a lot of bad breath.