How Oral Health Supports Your Immune System

How your immune system protects you every day

The immune system is composed of a complex network of organs, tissues, cells, and proteins that work to block invading pathogens and combat any that have breached those initial defenses.

The two main components of the immune system are the innate immune system and the adaptive immune system. The innate immune system provides an immediate response to invading pathogens. It includes physical barriers, such as skin and mucous membranes, as well as specialized cells that destroy pathogens.

The adaptive immune system provides a slower, more specific response to pathogens. It includes cells that produce antibodies to recognize and neutralize specific pathogens and other cells that directly attack infected cells.

Both parts of the immune system work together to protect the body from infection and disease.

How the oral microbiome supports immune defense

There are several immune defenses in your mouth that aid in blocking and fighting harmful pathogens.

The oral microbiome plays an important role in fighting pathogens.

• Beneficial bacteria compete with harmful bacteria for resources, such as nutrients and space, making it harder for the harmful bacteria to survive.
• The pH of saliva is neutral (6.5 - 7) and favorable for most species of bacteria
• Some microorganisms in the oral microbiome produce antimicrobial substances that can kill or inhibit the growth of harmful bacteria.

Overall, the oral microbiome serves as a first line of defense against harmful bacteria and helps to maintain the health of the oral cavity and the rest of the body.

Lifestyle factors that impact immune and oral health 

For your immune system to function at peak performance, it is important to avoid behaviors that have a negative effect on your overall health.

Behaviors and factors that contribute to a weakened immune system include:

• Lack of sleep or poor sleep quality
• Chronic stress
• Poor nutrition
• Lack of physical activity
• Smoking or exposure to secondhand smoke
• Excessive alcohol consumption
• Environmental irritants

It's important to note that these factors do not necessarily guarantee weakened immunity, but they can increase the risk of infections and illnesses. Existing infections also weaken your immune system which can trigger a compounding cycle of illness that may result in chronic disease.

Here are a couple additional resources to help you fully understand the impact these habits have on your oral health:

• Nutrition & Oral Health: Which Foods Are Good for Your Teeth?
• How and Why Should I Clean Between my Teeth?  

How daily oral care reduces immune burden 

Practicing good oral hygiene does not guarantee you won’t get sick, but it can lower your odds of catching that cold that’s going around and, should you catch it, help you get over it faster.

How?

1. Oral hygiene behaviors remove harmful bacteria and the food they need to thrive, maintaining the balance of your oral microbiome. This frees up your body’s defenses to attack other harmful pathogens that enter your body.
2. If you do get sick, maintaining your oral health ensures your body’s adaptive immune response only has to fight a battle on one front and can lead to a shorter duration of illness.

Oral inflammation and systemic health risks

Committing to a lifelong practice of good oral hygiene can reduce your risk of developing chronic health conditions such as gum disease, cardiovascular disease, diabetes, and cancer.

Poor oral hygiene has a cascading effect on your whole body health. Accumulation of plaque can lead to gingivitis. Untreated gingivitis can progress to periodontal disease. Both are what’s commonly known as gum diseases. Once the disease has reached this stage, it can trigger systemic health issues.

All of this places an extreme burden on your immune system and makes it more difficult to fight off other pathogens that enter your body.

Here are additional resources that explain the link between oral health and body health:

• Is Your Oral Health Affecting Your Overall Health?
• Gum Disease
• Diabetes and Oral Health
• Cancer and Oral Health

How gum inflammation affects the whole body

Your gums are made up of soft tissue and supported by a network of small blood vessels. When plaque builds up along the gumline, your immune system responds by sending protective cells to the area. In the early stages, this response may appear as redness, swelling or bleeding when you brush.

If plaque is not removed regularly, this inflammation can persist. Over time, the gums may become more irritated, and bacteria can collect below the gumline. As your body continues to respond, inflammatory signals may circulate beyond the mouth, contributing to overall strain on your immune system.

Research suggests that ongoing gum inflammation is associated with conditions such as cardiovascular disease and diabetes. While oral health is only one part of the picture, keeping your gums healthy helps reduce unnecessary immune activation.

By brushing twice daily and cleaning between your teeth, you help remove plaque before it can trigger prolonged inflammation. Supporting gum health in this way helps your immune system stay focused on protecting the rest of your body.

Build a daily routine that supports immune health

Practicing a complete oral care routine that includes twice-daily brushing, interdental cleaning, and rinsing will maintain balance within your oral microbiome.

Making positive changes to your lifestyle, such as getting enough sleep, eating a healthy diet, and reducing stress, can help strengthen your immune system and improve your overall health.

Oral health and the immune system FAQs