Drink at least 2 liters of water daily.
Avoiding bad breath is only one of the many health advantages of being hydrated. Water is necessary to keep the salivary glands functioning properly, and saliva inhibits the formation of microorganisms. The best defence against bacterial development and bad breath brought on by insufficient saliva and moisture in the mouth is to drink plenty of water. Sugary drinks should be avoided at night since they can encourage the growth of bacteria.
zw