The most effective way of battling bad breath, and preventing it happening in the first place, is to keep up a regular oral hygiene routine.
Brush all areas of your mouth thoroughly, for around two minutes, twice a day
Brush or scrape your tongue to remove bacteria, and floss between all of your teeth
Brushing sugar-free gum after a meal will help to subtly dislodge any trapped food, and chewing stimulates saliva that will naturally wash away tiny particles and bacteria.
However, it’s important that if you recognise bad breath as an ongoing issue, that you do speak to your dentist.