Hi! Welcome to Healthcaremagic.
I read your query. Bad odor can be due to either local oral causes like
dry mouth,
gum disease, cavities, calculus or systemic causes like diabetes, liver, kidney disease, stomach diseases, certain medications, etc.
Drink lots of water and keep you well hydrated. Visit
dentist and get an oral check up done. Get oral prophylaxis if required and treatment of any existing problem.
Chew sugarless gums ans candies. Keep good
oral hygiene. Brush twice daily learning proper brushing method from your dentist and use mouthwash.
If you have some medical history or taking any medicine,
bad breath can be due to that too. Consult your physician for further investigations if the problem persists after taking these measures.
Hope the answer helps you. Thank you.