A naturally occurring compound in the mouth may help teeth defend themselves against sugar. New clinical research suggests that arginine, an amino acid already found in saliva, can change how dental plaque behaves, making it less likely to produce the acids that lead to cavities.
In the study, people with active tooth decay developed dental biofilms under controlled conditions while exposed to sugar. Areas treated with arginine stayed less acidic after sugar exposure, reducing the chemical attack on tooth enamel. The biofilms also showed structural changes that may limit the formation of highly acidic zones.
Researchers also found shifts in the mix of bacteria living in plaque. Acid-producing microbes became less dominant, while bacteria that help neutralize acids increased. Together, the findings suggest that supporting natural processes in the mouth could help lower cavity risk by reshaping plaque rather than simply trying to remove it.
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