Thanks for asking the query,
or halitosis can be because of many reasons few are poor oral hygiene
, plague and calculus deposition, systemic conditions like diabetes, hormonal disturbances, tongue coatings, mouth breathing
, oral infections, GIT disturbances, sinusitis, pharyngitis
I would suggest you to get complete physical and dental examination done.
Go for symptomatic treatment of complete mouth scaling and polishing.
Avoid eating of food like raw onion, garlic.
Clean your tongue with a tongue cleaner.
Use antiseptic mouthwash rinses.
Take complete balanced diet and drink lots of water to keep yourself hydrated.
Hope this helps out.