When you go to sleep, it’s usually right after brushing your teeth — leaving your mouth feeling fresh and minty. But when you wake up, that freshness is gone, replaced with an unpleasant taste and odor we all know as “morning breath.” So, what exactly happens in your mouth while you sleep?

When You Sleep, Your Saliva Flow Decreases

Throughout the day, your mouth is continually washed by saliva. Your salivary glands produce saliva that helps rinse away food particles, neutralize acids, and control bacterial growth. This natural cleansing action keeps your mouth healthy and your breath fresh.

However, when you fall asleep, your salivary glands slow down dramatically. With less saliva, bacteria have the perfect environment to multiply. As these bacteria break down food particles and organic matter, they release volatile sulfur compounds — the main cause of bad breath in the morning.

Can You Prevent Morning Breath?

While you can’t stop saliva production from slowing down completely at night (and you wouldn’t want to — otherwise, you’d drool excessively), there are steps you can take to minimize morning breath:

• Stay hydrated throughout the day to keep saliva production steady.
• Brush and floss thoroughly before bed to remove leftover food and plaque.
• Use a mouth rinse before sleeping to reduce bacterial buildup overnight.
• Rinse your mouth first thing in the morning to wash away bacteria and refresh your breath.

Good nighttime oral care doesn’t just make mornings fresher — it also helps prevent gum disease and tooth decay in the long run.

If you have any questions or would like to schedule an appointment, please call us at (510) 848-0114 to