Porphyromonas gingivalis
BacteriaA key “red complex” bacterium strongly linked to severe periodontal disease.
This is information about your result, not a diagnosis. Your provider can tell you what it means for you.
What is Porphyromonas gingivalis?
P. gingivalis is an anaerobic bacterium that thrives in deep periodontal pockets. It is one of the three “red complex” pathogens, a group of bacteria most strongly associated with chronic and aggressive forms of gum disease. It produces enzymes that break down gum tissue and evade the immune system.
Why it matters
P. gingivalis is thought to be one of the main bacteria behind serious gum disease. It upsets the normal balance of bacteria in the mouth and is associated with long-running inflammation and bone loss around teeth. Researchers are also studying possible links to conditions elsewhere in the body; those links are not settled.
What a high result can mean
A high level is associated with active gum disease, or a higher chance of it. The higher the count, the more of the bacterium is present below the gum line. Your dentist weighs this alongside what they see in your mouth.
What usually happens next
Your dentist may suggest a deep cleaning and, sometimes, an antibiotic or other treatment. That decision is theirs to make with you. A repeat test after treatment can show whether the level has come down.
Related markers
Treponema denticola
A red complex spirochete bacterium associated with advanced periodontal disease.
Tannerella forsythia
The third member of the red complex, consistently found in progressive periodontal lesions.
Matrix metalloproteinase-8
An enzyme that directly breaks down collagen, the structural protein of gum tissue.
Interleukin-6
A pro-inflammatory cytokine that signals active tissue inflammation.
This page explains what the test measures. It is not a diagnosis, and it cannot tell you what your result means for you. Your provider can.