12: The Myth Busted: Not All Mouthwashes Harm Your Microbiome with Dr. Rob & Tami

Is mouthwash really destroying your oral microbiome—or can the right formulas actually help it thrive?

In this episode of Dental Formulator’s Playbook, Dr. Rob and Tami tackle the widespread myth that all mouthwashes harm the oral microbiome. They review clinical evidence on cetylpyridinium chloride (CPC) and essential-oil rinses, showing how some formulas can selectively reduce problem bacteria while preserving—or even supporting—beneficial species. The discussion covers how the microbiome adapts to treatment, why claims must be evidence-based, and a fresh idea: rotating oral-care products seasonally to help maintain a balanced biofilm. Dr. Rob also underscores the importance of clinical data, sound formulation, and understanding regulatory standards when evaluating (or creating) oral health products.

🔥 Highlights ↠

• Debunking the myth that all mouthwashes harm the oral microbiome
• Clinical findings where CPC use correlated with increases in commensals (e.g., Streptococcus salivarius, Neisseria flavescens)
• How impacts differ among chlorhexidine, CPC rinses, and essential-oil formulas
• Commensal vs. opportunistic bacteria and the realities of biofilm ecology
• Evidence that the oral microbiome is resilient and adapts to interventions
• Key takeaways from recent studies across Japan, Taiwan, and Europe
• Why planktonic testing alone is insufficient for evaluating oral-care efficacy
• CPC performance across formats: mouthwash vs. toothpaste vs. oral spray
• Regulatory essentials: monographs, dosing, and formulation compatibility
• A practical proposal: seasonal rotation of oral-care products to avoid microbial stagnation

Connect with Dr. Rob (Robert L. Karlinsey, PhD)

🌐 Website: https://customdentalformulations.com/meet-dr-karlinsey

📄 Research Profile: https://www.researchgate.net/profile/Robert-Karlinsey