Researchers studying the oral microbiome found that disrupting bacterial communication molecules can alter dental plaque and shift microbial communities toward health-associated species. The research published in 2025 demonstrates how targeted enzyme intervention could transform periodontal disease prevention without destroying beneficial oral bacteria.
How Dental Plaque Behaves Like a Forest Ecosystem
Bacteria are remarkably good at adapting, enabling them to survive changing conditions and become resistant to antibiotics and disinfectants when harmful species emerge. However, these microorganisms are not simply enemies to eliminate, as many species play vital roles in human health, including the hundreds of different microbes that live inside the human mouth. Rather than trying to kill bacteria, scientists explored whether they could influence how these microorganisms behave and encourage healthier microbial communities.
Dental plaque develops in a sequence much like a forest ecosystem, changing over time rather than appearing all at once. Early communities contain relatively harmless bacteria, while more complex communities eventually include species strongly associated with gum disease.
Oxygen Levels Shape Bacterial Communication Across the Gumline
One of the most important findings from the research was that the effects of bacterial communication depended heavily on oxygen levels. Oxygen availability changes everything about how these chemical signals behave, with quorum sensing playing very different roles above and below the gumline. Conditions below the gumline can favor bacteria associated with periodontal disease, creating an environment where the same chemical signals influence microbial communities in contrasting ways depending on where they occur in the mouth.
Above the gumline, where oxygen is more plentiful, disrupting signaling favored bacteria linked with better oral health. Beneath the gumline, adding those same signals encouraged later colonizing species associated with disease. This distinction has major implications for how researchers approach the treatment of periodontal diseases.
Using Specialized Enzymes to Alter Plaque Communities
To test these dynamics, the team utilized specialized enzymes called lactonases to remove signaling molecules and break down their communication.
By disrupting the chemical signals bacteria use to communicate, researchers demonstrated that one could manipulate the plaque community to remain or return to its health-associated stage. Instead of seeking to wipe out all microorganisms entirely, scientists aim to use the disruption of bacterial signaling as a method to steer plaque back toward a beneficial, early composition.
Such bacterial disruptions, frequently termed microbiome dysbiosis, are also found in other regions of the human body and connect to multiple medical conditions, such as specific forms of cancer. The research team now wants to investigate how bacterial communication varies throughout the mouth and among people at different stages of periodontal disease, with the ultimate goal of providing a foundation for therapies designed to steer microbial communities toward healthier states rather than simply destroying them. The research was funded by the National Institutes of Health.