1. Brush and floss regularly.
    Plaque on your teeth, collects bacteria that cause bad breath.  Trapped food around the gums also adds to the problem.Brush your teeth at least two times each day, and floss at least once. If you're concerned about your breath, do both a little more often.Don't overdo things, though. If you brush too hard you can wear down the enamel on your teeth , making them vulnerable to decay.
  2. Use Mouth rinse.
    Besides freshening your breath, A mouthwash adds extra protection by getting rid of odour producing bacteria. A good mouthwash used well could be the game changer. But be sure the mouthwash you choose kills the germs that cause bad breath. Don't just cover up the smell. Rinse daily with a good mouthwash and stop bad breath at its source.
  3. Scrape your tongue regularly.
    The coating that normally forms on your tongue can be a host for smelly bacteria. To get rid of them, gently brush your tongue with your toothbrush. Newer brushes have tongue scrapers on the dorsum of the brushes which help in gently and effectively cleaning the tongue of its debris.
  4. Avoid foods that ruin your breath.
    Onions and garlic are the biggest offenders. But brushing after you eat them doesn't help.The substances that cause their bad smells make their way into your bloodstream and travel to your lungs, where you breathe them out.The best way to stop the problem? Don't eat them, or at least avoid them before you go to work or see friends.
  5. Don't smoke.
    Besides causing cancer, smoking also damages your gums, stains your teeth, and gives you bad breath.Over-the-counter nicotine patches can help tame the urge. If you need a little help, make an appointment with your doctor to talk about quit-smoking programs or medications that can help you give up tobacco forever. Make up your mind. Sooner the better!!
  6. Skip after-dinner mints and chew gum instead.
    The bacteria in your mouth love sugar. They use it to make acid. This wears down your teeth and causes bad breath. Chew sugarless gum instead. Chewing gum stimulates saliva, which is the mouth's natural defense mechanism against plaque acids, which cause tooth decay and bad breath. Prefer sugar free gums for the same.
  7. See your doctor
    If your bad breath continues despite your best efforts, make an appointment with your doctor. He'll check to see if your problems are related to any underlying medical condition.