A new study has identified simvastatin, a widely used cholesterol-lowering medicine, as a promising add-on treatment for periodontitis, a serious gum infection that can damage the tissues and bone supporting the teeth. Reported by News-Medical on 26 July 2026, the research focused on Porphyromonas gingivalis, a major periodontitis-related bacterium that can hide inside host cells, making it harder for standard antibiotics to fully clear the infection and allowing inflammation and tissue damage to continue. Researchers found that simvastatin may help block bacterial invasion pathways and work alongside metronidazole, a commonly used antibiotic, to improve bacterial clearance at lower antibiotic doses. In a rat model of periodontitis, simvastatin combined with metronidazole reduced bacterial load, inflammation and alveolar bone loss, while also supporting bone-forming activity. The findings are still preclinical and do not mean patients should use statins as a gum-disease treatment without medical guidance, but they open an exciting drug-repurposing path: a medicine best known for heart health may one day help dentists treat severe gum disease more effectively, especially where infection, inflammation and bone loss overlap.