A new way to fight gum disease without wiping out good bacteria
Scientists discovered that disrupting the chemical messages bacteria use to communicate can push dental plaque toward a healthier microbial balance. The approach could lead to new treatments for gum disease that control harmful bacteria without destroying beneficial species.
Scientists have discovered a potential new method to promote oral health by manipulating the chemical signals bacteria use to communicate within dental plaque. The study, published in npj Biofilms and Microbiomes in 2025, revealed that interfering with these quorum sensing molecules known as N-acyl homoserine lactones (AHLs) can shift the bacterial community toward species more strongly associated with good oral health.
Dental plaque, which develops in a sequence similar to a forest ecosystem, contains both pioneer species like Streptococcus and Actinomyces, as well as late colonizers like Porphyromonas gingivalis, which is strongly linked to periodontal disease. By using specialized enzymes called lactonases to break down AHL signals, researchers observed a shift in the dental plaque community towards more beneficial bacteria.
This discovery suggests that targeted enzyme treatments could potentially be used to help maintain a healthier balance of microorganisms in the mouth, offering a promising alternative to traditional methods of eliminating harmful bacteria.
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