01/27/2026
Toxic Tuesday: ORAL INFECTION CONNECTED TO BREAST CANCER
A new study shows that an oral bacterium may promote breast cancer development and spread. Groundbreaking research from Johns Hopkins Medicine shows that a common oral microbe, Fusobacterium nucleatum, often linked with periodontal (gum) disease and root canals, may travel through the bloodstream and lymphatic vessels, settle in breast tissue, and actively promote DNA damage, tumor growth, and cancer spread.
This study provides the first solid evidence that an oral bacterium doesn’t just live in your mouth. It can impact organs far away.
The researchers found that F. nucleatum can alter how cells behave, causing inflammation and accelerating cancer progression, especially in breast cells with genetic vulnerability (like BRCA1 mutations). While this work is still early and more research is ongoing, it demonstrates a powerful connection between oral health and cancer risk reminding us that the mouth truly is a gateway to the rest of the body.
As a practical perspective, of the hundreds of root canals I have removed and sent in for DNA testing, almost every sample tests positive for F. nucleatum.
If inflammation and bacterial imbalance in the mouth can influence distant tissues, then prevention matters! This goes beyond daily brushing and flossing and regular dental cleanings. Dental issues that trigger your immune system such as gum disease, tooth decay, and root canals may increase your risk for cancer. To work with one of the most experienced Biological Dentists in the world, reach out to our team at Blodgett Dental Care to learn how we can help you ensure that your mouth is not contributing to whole-body diseases such as cancer.
Reach out through our website or call to discover how BDC can help you experience optimal health!