Thanks for asking the query,Bad breath
occurs due to many causes few are local causes like plague
and calculus deposition, GIT disturbances, alcohol consumption, smoking
, tongue coating, oral pathological conditions.
I would suggest you to get complete mouth scaling once in every six months.
Develop a habit of brushing your teeth twice daily.
Use interdental cleaners, dental floss.
Use antiseptic mouthwash rinses twice daily.
Clean the tongue with a tongue cleaner.
Take complete balanced diet, drink plenty of water and keep yourself hydrated.
If you are having any systemic problems get it treated.
Hope this helps out.