Sillim Station Dentist - What Causes Morning Bad Breath?

Hello. This is Yonsei U-Line Dental Clinic, Sillim Branch, located in Sillim-dong, Gwanak-gu, near Exit 7 of Sillim Station.

Today, we would like to talk about the causes of morning bad breath, something many people can relate to.

In fact, bad breath can occur for various reasons, but there are many cases where it feels especially severe in the morning.

That is why people sometimes joke that even married couples turn their faces away from each other in the morning. Why exactly is bad breath worse in the morning?

And is there any way to reduce it?

First, the basic cause of bad breath is bacteria in the mouth.

During sleep at night, however, conditions are created that are ideal for these bacteria to become active. This is because saliva production decreases sharply while we sleep.

Normally, saliva is continuously produced to wash the mouth and help control bacteria to some extent, but almost no saliva is produced while we sleep.

If it continued to flow, you might be repeatedly awakened by having to swallow. That is why the body automatically reduces saliva production.

When saliva decreases like this, the mouth becomes like stagnant water where no water is flowing.

A flowing stream is clean, but when water sits still, it becomes cloudy, right? The same is true of the mouth. When saliva decreases, the mouth's self-cleaning function declines, bacteria multiply more, and bad breath becomes more severe.

The second factor is the habit of going to bed without brushing your teeth.

When you go to bed without brushing, food particles left in your mouth become a perfect source of food for bacteria.

The bacteria essentially multiply explosively, as if saying, “Oh, food has arrived!”

In other words, the inside of your mouth becomes like a bacterial culture medium.

There is one more factor: the habit of sleeping with your mouth open.

Most people sleep with their mouths closed, but some sleep with their mouths open because of rhinitis, malocclusion, or other reasons.

In this case, the mouth becomes even drier, making it easier for bacteria to grow. Therefore, if you have a habit of sleeping with your mouth open, your bad breath may become worse.

So, what should you do to reduce morning bad breath?

The first step is to prevent bacteria from getting food—in other words, keeping your mouth clean is the most important thing.

Brushing your teeth before bed is essential.

Many people eat something else after dinner, right? Fruit, drinks, snacks—anything. You may think, “This little bit should be fine,” but it can become a full feast for the bacteria in your mouth.

So make sure to brush again before bed—no exceptions!

Brushing alone may not be enough.

It is also a good idea to remove food particles between your teeth using an interdental brush or a water flosser.

The time of day when you should brush most thoroughly is right before bed. This can greatly reduce morning bad breath.

The second method is to help balance the bacteria in the mouth.

A variety of bacteria naturally live in our mouths, including bacteria that cause odors.

The problem arises when there are too many of these harmful bacteria.

For this reason, some people are now using probiotics—beneficial bacteria—in the mouth. Just as there are probiotics that are beneficial for the gut, there are also probiotics that are beneficial for oral health.

Many people feel that their morning bad breath has noticeably decreased after using these probiotic products consistently.