Halitosis (bad breath)
Dry mouth, having poor oral hygiene, acid reflux, having calculus (teeth tartar) build-ups under your gums could be the reason. Have your gums checked in case you need a deep cleaning (scaling root planning). I don’t recommend using mouthwash too often as you can get rid of the normal flora of your mouth. One other thing, get mouthwash that doesn’t have alcohol in it.
Hope this helps,
Jossi Stokes, DDS
is a good start. If that does not help, then there are things like breath Rx; that can be used after consulting your dentist.
Hope this helps :)