Do Mouthwashes Disrupt the Oral Microbiome? A Balanced Perspective

A growing debate questions whether antimicrobial mouthwashes disrupt the oral microbiome—the community of bacteria, fungi, and other microorganisms essential for health. Critics argue that rinses indiscriminately kill good and bad bacteria, potentially altering nitric oxide (NO) metabolism and contributing to disease. The key question is not simply whether rinses cause disruption, but whether this disruption results in meaningful harm—or whether the benefits outweigh the risks.
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What the Studies Say
Several studies show that rinses, especially chlorhexidine (CHX), reduce nitrate-reducing bacteria on the tongue. This may slightly lower nitric oxide levels and has been linked to small, temporary increases in blood pressure...
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