How Can Bacteria From the Mouth Affect the Heart and Brain?
Your mouth is home to hundreds of different types of bacteria. Most are harmless or even beneficial when kept in balance. However, poor oral hygiene, gum disease, and untreated dental infections allow harmful bacteria to multiply and enter areas of the body where they don’t belong.
Research has shown a connection between oral health and overall health, particularly the health of the heart and brain. But how can bacteria from the mouth travel to these important organs? And what does it mean for your health?
How Bacteria Get From the Mouth Into the Body
The gums are one of the body’s natural barriers. When gums become inflamed or infected, as happens with periodontal (gum) disease, that barrier can become damaged.
Brushing, flossing, chewing, and even professional dental cleanings can cause tiny amounts of bacteria to enter the bloodstream, especially when the gums are bleeding or infected. This is known as bacteremia.
A healthy person with a well-functioning immune system can eliminate these bacteria quickly. However, repeated or prolonged exposure to oral bacteria can contribute to inflammation throughout the body. In some circumstances, bacteria can also travel through the bloodstream and reach other tissues and organs.
How Can Oral Bacteria Affect the Heart?
Oral health and heart health have a complex relationship. While researchers have found an association between gum disease and cardiovascular conditions, this doesn’t mean that gum disease is the direct cause of heart disease for everyone.
One possible connection is inflammation. Periodontal disease causes an ongoing inflammatory response in your gums. This inflammation can affect more than just your mouth and may contribute to processes involved in cardiovascular disease.
When bacteria enter the bloodstream, they may also interact with blood vessel walls. Some bacteria have been found in arterial plaque, although researchers are still studying exactly what role these bacteria play in the development and progression of cardiovascular disease.
There is also a direct risk for people with certain heart conditions. In rare cases, bacteria that enter the bloodstream can attach to damaged or abnormal areas of the heart, potentially causing a serious infection called infective endocarditis. This is why some people with specific heart conditions may need special care precautions, such as antibiotics, before certain procedures.
Your dentist and physician can help determine whether you’re at increased risk.
How Can Oral Bacteria Affect the Brain?
Scientists are also actively researching the connection between oral health and the brain. Studies have shown an association between periodontal disease and certain neurological conditions, such as stroke and dementia. However, scientists are still working to understand whether oral bacteria directly contribute to these conditions or whether other shared risk factors are responsible.
There are several ways oral health may be connected to brain health.
Through the Bloodstream — Harmful bacteria from gum disease can slip into your blood when gums bleed and possibly release harmful toxins that reach brain tissue.
Through Inflammation — Researchers are investigating whether persistent inflammation from oral disease may contribute to neurological disorders.
Along Nerve Pathways — Researchers have also explored whether certain oral bacteria or their byproducts could interact with the nervous system through pathways involving nerves in the face and mouth.
Does Gum Disease Cause Heart Disease or Dementia?
It’s important to understand the difference between an association and a direct cause.
People with gum disease may have higher rates of certain cardiovascular and neurological conditions, but that doesn’t mean gum disease alone caused those conditions. May risk factors overlap.
For example, smoking, diabetes, age, diet, and socioeconomic factors can influence both oral and overall health. Researchers continue to study whether treating gum disease can reduce the risk of cardiovascular or neurological disease.
The safest conclusion is that oral health is an essential part of overall health, and taking care of your mouth may help reduce inflammation and prevent infections.
How to Prevent Gum Disease
Keeping harmful bacteria under control can help protect your teeth and gums and reduce the risk of serious dental infections.
A good oral routine should include:
- Brushing your teeth twice a day with fluoride toothpaste
- Cleaning between your teeth daily with floss
- Visiting your dentist for regular exams and professional cleanings
- Treating cavities and gum disease promptly
- Limiting excessive sugar
- Avoiding tobacco products
If your gums frequently bleed, appear swollen or red, or feel tender, you should schedule a dental exam, as you could have an infection.
Protect Your Mouth to Support Your Overall Health
Your mouth is connected to the rest of your body in many ways. Bacteria from the mouth can sometimes enter the bloodstream, and inflammation caused by oral infections may affect tissues beyond the mouth. Researchers continue to investigate how these processes may influence the heat, brain, and overall health.
While more research is needed to fully understand these connections, one thing is clear: taking care of your teeth and gums is an important part of taking care of yourself.