BMJ Group Medical Reference
There are several things you can do to keep your mouth clean. These can reduce the number of bacteria in your mouth, which may make your breath fresher. We didn't find any good research on these things, but your dentist may suggest:   
Brushing your teeth twice a day with a fluoride toothpaste
Cleaning between your teeth once a day, using floss or an interdental cleaner
Using an anti-bacterial mouthwash
Cleaning your tongue with a tongue brush or soft toothbrush
If you wear dentures, removing them at night, and making sure you clean them thoroughly before putting them back in next morning
Having regular check-ups with a dentist.
Bacteria are tiny organisms. There are lots of different types. Some are harmful and can cause disease. But some bacteria live in your body without causing any harm.
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