When you sleep, you have a decreased flow of saliva. Breathing through the mouth continuously can also cause dry mouth and bad breath. Both can happen while you're sleeping, resulting in bad breath in the morning.



If you wear dentures, be sure to remove them at night and clean them thoroughly before replacing them the next morning.



Brush twice a day and clean between your teeth daily with floss. Brush your tongue, too.



If bad breath is more frequent, talk to your dentist. He or she can help to diagnose the cause.