Scientists discover a new way to prevent gum disease without killing good bacteria

Scientists discover a new way to prevent gum disease without killing good bacteria | ScienceDaily Science News from research organizations Scientists discover a new way to prevent gum disease without killing good bacteria Date: May 8, 2026 Source: University of Minnesota, Twin Cities Summary: Scientists have uncovered a surprising way to influence the bacteria living in our mouths — not by killing them, but by interrupting how they “talk” to each other. Researchers found that dental plaque bacteria use chemical signals to coordinate growth, and by blocking those signals, they were able to encourage healthier bacteria while reducing disease-linked microbes tied to gum disease. Even more intriguing, the bacterial conversations changed depending on oxygen levels above and below the gums, revealing an entirely new layer of complexity inside the mouth. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY Computer-rendered split image of bacteria on a tooth surface. When microbial communication is “on”, disease-associated species grow (left). Disrupting this communication (right) promotes health-associated bacteria. Credit: University of Minnesota Bacteria are constantly evolving to survive. One major consequence is that many harmful microbes are becoming resistant to antibiotics and disinfectants, creating serious challenges for medicine and public health. But not all bacteria are dangerous. In fact, many are essential to keeping the human body healthy. Now, scientists are exploring whether it may be possible to influence bacterial behavior instead of simply trying to destroy bacteria outright. Inside the human mouth, bacteria are in near constant communication. Roughly 700 bacterial species live there, and many exchange chemical messages through a process called quorum sensing. Some of these microbes communicate using signaling molecules known as N-acyl homoserine lactones (AHLs). Researchers from the College of Biological Sciences and the School of Dentistry set