There are many reasons for bad breath like bad oral hygiene gum infections , gastrointestinal infections,tonsilitis,
liver and
kidney disorders,some times dry mouth and in diabetic patients also it is seen. Certain food items also creates bad smell try to avoid those.
You need to see your dentist to rule out the cause. Apart from that drink lots of water brush twice a day, use mouthwash, clean your tongue also after brushing, add fiber in your diet.
Next Steps
please visit your dentist
Health Tips
increase your liquid intake