Water keeps your mouth and body hydrated. Bacteria grow in absence of saliva and dry conditions, thereby giving you bad breath.
Pineapple could be very effective. Drink a glass of pineapple juice or eat a pineapple slice after a meal.
Yogurt contains healthy bacteria that can kill bad bacteria that cause bad breath.
Green tea has disinfectant and deodorizing properties that can help you get rid of bad breath.
You can try parsley, orange and zinc supplements also.