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There is any reasons for bad breath.

A lot of people have it when they wake up, which probably means they got dry mouth and need to hydrate more.

But generally speaking, brush your teeth twice a day, floss to ensure plaque no build up on your teeth. If your tongue is white, maybe need to get a tooth brush with a tongue cleaner on the back. Maybe mouth wash to kill bacteria.

If cleaning doesn't help an the bad breath is there, perhaps something is lodged in your tonsils area that is infected with bacteria.

Perhaps get your teeth checked for decay (jaw x ray). I couldn't feel pain but had decay which got infected and caused some bad breath.