Do you need to brush your teeth before drinking water in the morning?

For the smart you, you may have this question before drinking water in the morning: Do you drink without brushing your teeth in the morning, will you drink the bacteria in your mouth into your body?

This is a common but strange problem-we all know that there are many bacteria in the mouth, so it is inevitable to have such worries.

But do you really need to brush your teeth before drinking water in the morning?

It is necessary to explore, after all, when thirsty I do not have time to brush my teeth!

Brush your teeth or drink water first, this is a question worth thinking about.
Brush your teeth or drink water first, this is a question worth thinking about.

The ever-present oral bacteria

No matter whether you brush your teeth or not, drinking water at any time will bring a lot of bacteria into your body.

The earth we live on is a world full of all kinds of microorganisms, including all kinds of bacteria everywhere. Your hands, mouth, cup and even water contain a lot of bacteria.

Although most microorganisms are sensitive to physical and chemical factors including heat, acid and alkali, high osmotic pressure, ultraviolet rays, ionizing radiation, etc. However, it is not so easy to completely eliminate microorganisms on an object or in space.

For example, high temperature sterilization, although most bacteria will be killed when heated to 68℃, but:

However, to completely kill all bacteria, it needs to be heated to 120℃(248℉) for 30 minutes.

We know that when the altitude is 0, the boiling point of water is 100℃(212℉), so boiling cannot kill all bacteria.

In the past, high-pressure boilers were needed to sterilize medical surgical instruments at high temperatures.

As for chemical disinfectants, such as 75% alcohol and even iodophor, which is now widely used, cannot guarantee the killing of all bacteria.

The main products of toothpaste are nothing more than friction agents and detergents, that is, other additives. Daily chemicals, including toothpaste, do not advocate the addition of fungicides. At present, it is even prohibited to add fungicides to some extent.

Therefore, brushing teeth can help clean the oral cavity and teeth, also can remove some bacteria in the oral cavity and reduce the bacterial density in the oral cavity.

However, this effect is very limited, even after strict brushing, there are still a lot of bacteria in the mouth.

As mentioned above, the water cup we drink is just as full of bacteria as the water we drink. Therefore, whenever you drink water, you will inevitably drink a lot of bacteria.

Therefore, whether it is hot summer or thirsty in the morning, when you need to drink water, you need not consider so much (unless the water you drink is not disinfected).

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Is it worth worrying about?

There is no need to worry at all.

The reasons are as follows:

1. Not all bacteria are pathogenic

The vast majority of bacteria in the world do not cause human infection and disease.

There are only very few kinds of bacteria that can cause human infection. Moreover, even for pathogenic bacteria, infection also requires some conditions.

There are more than 5,000 kinds of complex bacteria in our intestines, which are divided into three categories:

  • Beneficial bacteria, bacteria beneficial to health, such as bifidobacterium and lactobacillus;
  • Conditional harmful bacteria are harmful to human body under certain conditions, but in general, they are slightly beneficial to human body, such as Escherichia coli.
  • Pathogenic bacteria, bacteria harmful to human beings, such as Clostridium perfringens, Pseudomonas aeruginosa, etc.

Therefore, you don’t need to hear the word “bacteria” to be scared. Our bodies have certain self-regulation and defense capabilities.

If you eat and drink water everyday, just wash your hands.

Don't worry, which bacteria in the water you drink won't do much harm to your body.
Don’t worry, which bacteria in the water you drink won’t do much harm to your body.

2. The shielding mechanism of gastrointestinal tract

Because we have a series of defense and anti-infection mechanisms, even if bacteria enter our bodies-the vast majority of healthy people have little chance of infection.

These include the barrier mechanism of gastrointestinal tract.

Our gastrointestinal tract, respiratory tract, urinary tract, reproductive tract and other cavities all have barrier mechanisms, which isolate the external environment from the internal tissues and blood environment.

In other words, the bacteria that drink water do not really enter the body, but enter the gastrointestinal tract. The barrier mechanism inherent in gastrointestinal tract will prevent these bacteria from entering the internal environment of the body through gastrointestinal mucosa.

On the other hand, our gastrointestinal tract is already full of various microorganisms, the number of which exceeds the imagination of most people.

For the large intestine with the highest microbial density, the number of microorganisms is several times that of all cells in our body.

Studies have found that the average adult has nearly 100 billion bacteria per gram of wet feces, accounting for 33% of the dry weight of feces.

The study of fresh feces collected under strict anaerobic conditions found that almost 50% of all these bacteria are living bacteria.

-now, you can calculate how many bacteria are in our intestines.

It is definitely a super astronomical number!

In this way, do we still need to care about the little bacteria that we drink more because we don’t brush our teeth and drink a glass of water?

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3. The strongest defense: gastric acid

As the offspring of the former miscellaneous scavenger, our strong stomach acid also makes us not need to care about bacteria-which is why eating probiotic products is a waste of money.

As we all know, the concentration of high-intensity gastric acid in human stomach is very high, and the lowest PH value is even lower than 1.5.

For a long time, people have been puzzled about this: gastric acid does not seem to have any effect on maintaining digestive function except to participate in the initiation of protein digestion.

Why do we have to spend such a huge cost to maintain such a high intensity of gastric acid environment?

After continuous research, scientists now believe that many animals, including humans, maintain a high-intensity acidic environment in the stomach, not mainly for digestion, but a chemical barrier for microorganisms to enter the intestinal tract with a larger exposed area.

Although there are super-astronomical microorganisms in our intestines, our gastrointestinal tract also has a strong defense mechanism.

The gastric acid in our stomach is a very powerful sterilization environment.
The gastric acid in our stomach is a very powerful sterilization environment.

However, after all, there are some bacteria that can cause infection. Or it can destroy the inherent balance of microorganisms in the intestinal tract, cause flora imbalance, and increase more troubles and risks.

This is also the reason why people have always said that “diseases come from the mouth”.

We eat so many bacteria every day, why does it usually cause neither infection nor even changes in intestinal flora?

Because, under the action of strong gastric acid chemical barrier, most of the bacteria we eat will be killed in the stomach. Only when we eat a large amount of food, especially liquid food, can a small part of the bacteria get away with it.

Through the study of different animals, scientists found that the main function of gastric acid may not be digestion-but sterilization-at least in the past.

Scientists have found that according to the dietary changes of human evolution, the PH value of gastric acid gradually increases. This is enough to show that the main biological significance of gastric acid is sterilization, not digestion.

In addition, animal and human studies on a large number of oral probiotic products have also found that, unless mixed with a large amount of liquid diet, almost all living bacteria existing in various forms of oral probiotic products will be killed in the stomach.

Most of the probiotics we take cannot reach the intestinal tract at all, let alone improve the intestinal flora.


To sum up, the worry that drinking water before brushing your teeth will cause you to drink bacteria is totally unfounded.

However, I do not suggest that you do not brush your teeth in the morning. If you decide not to brush your teeth after reading this article, it is absolutely wrong!

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Hello, I am a website editor. I've edited more than 10 websites in the last five years. My hobbies are health, life and website technology. For me, writing an article is part of my life. All articles on the page are based on scientific confirmation, not individual speculation, and more source comments will be added in the future. Thank you for reading!

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  1. 08/07/2019

    […] Do you need to brush your teeth before drinking water in the morning? […]

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