hi,
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.
Regards..