How Oral Bacteria Could Be Connected to Brain Abscesses

December 23, 2025

An illustration of oral bacteria

Although they’re so small you can’t see them with the naked eye, oral bacteria can be very dangerous to your teeth, gums, and even the rest of your body. While scientists have long known that these microscopic menaces are responsible for everything from cavities to gum disease, new research has discovered a link between these tiny terrors and a life-threatening condition called a brain abscess.

What is a Brain Abscess?

A brain abscess is an infection of the brain tissue. It can be caused by fungi, parasites, or even bacteria. In many cases, they form because of a nearby infection, such those in the ears or sinuses. They can also travel through the bloodstream from other areas. Symptoms include headaches, fever, seizures, weakness, and confusion.

How Are Brain Abscesses Connected to Oral Bacteria?

In a recent study, researchers from the University of Plymouth examined the records of 87 patients who were diagnosed with brain abscesses and discovered that of those sampled, 52 who had no clear cause were approximately three times more likely to have oral bacteria present in their abscesses.

How to Reduce Oral Bacteria Levels

While brain abscesses are extremely rare, unfortunately oral bacteria is not. In fact, the average mouth has between 6 billion and 20 billion oral bacteria in their mouth at any given time. The good news is that not all of them are bad for you. In fact, some are actually beneficial and can help keep your teeth and gums healthy and strong. However, the bad ones can be very dangerous, which is why it’s so important to brush your teeth twice a day and floss daily. Doing so will help kill these bacteria and neutralize the acid biproducts they leave behind which can lead to cavities.

Another way you can reduce your bacteria levels is by visiting your dentist twice a year for your regular, preventive exams and cleaning. At these appointments, your dental team will remove built-up tartar and plaque deposits on your teeth, which are essentially hardened bits of food and bacteria. By clearing them away, your teeth will both look and feel better, as well as lower your risk of oral and other infections.

Remember, although brain abscesses are rare, it is important to note that oral bacteria are not. Thus, to ensure that your mouth and body stay as healthy as possible, be sure to implement a solid at-home oral health routine and visit your dentist every six months for your routine preventive exam and cleaning.

About Our Practice

Dr. Bradford Young and Dr. Reem Horani have over 20 years of experience saving the smiles of parents of all ages. If you are suffering from a dental emergency, don’t wait for it to spread to other areas of the body or cause undue pain. Call us as soon as possible at 610-439-1363.