Water. Lack of fluids in your body reduces production of saliva. So saliva no longer protects the growth of bacteria that cause bad breath. Drink more water in order not to reduce your saliva.
Citrus fruits. Oranges, lemons, limes, kiwi and other fruits rich in vitamin C, help to maintain fresh breath. It is known that vitamin C is very effective in fighting bacteria. In addition, it is an excellent antioxidant and helps your body to eliminate toxins, including those caused by bacteria in the mouth.
Spices and herbs. Cardamom, fennel, mint, parsley, rosemary, eucalyptus, coriander, cinnamon, cloves and many other spices and herbs have positive effect on your breath.
Probiotics. Probiotics (yogurts with probiotics) help to treat wounds in the mouth and reduce the amount of hydrogen sulfide, which is released as a by-product of some bacteria.
Vegetables. Vegetables such as broccoli, carrots and cucumbers can kill bacteria in the mouth and helps on production of saliva.
Apples. Apples also increase production of saliva and cleanse bacteria in the oral cavity, thereby refreshing your breath.