Overview
What is it?
Cetylpyridinium chloride (CPC) is a quaternary ammonium compound used in over-the-counter mouthwashes at concentrations of 0.05–0.07%. It is a cationic antimicrobial that reduces plaque and gingivitis.
How does it work?
CPC is a cationic surfactant that binds to negatively charged bacterial cell membranes, increasing permeability and causing leakage of intracellular contents. It also reduces bacterial adhesion to tooth surfaces.
When is it commonly used?
Used as a daily over-the-counter mouthwash for plaque control and gingivitis prevention. Unlike chlorhexidine, CPC does not cause significant tooth staining, making it more suitable for long-term use.
Mechanism of Action
CPC is a positively charged molecule that interacts with the negatively charged bacterial cell surface. This disrupts the cytoplasmic membrane, causing cellular contents to leak and the cell to die. CPC also inhibits bacterial adherence and co-aggregation, reducing biofilm formation. It has some substantivity but less than chlorhexidine.
Organisms Studied
| Organism | Abbr. | Research Finding |
|---|---|---|
| Porphyromonas gingivalis | Pg | CPC reduces Pg in plaque; less potent than chlorhexidine but effective for daily use. |
| Streptococcus mutans | Sm | CPC reduces Sm adhesion and biofilm formation. |
| Fusobacterium nucleatum | Fn | Reduced by CPC in in vitro biofilm studies. |
Evidence Summary
Benefits
- Available over-the-counter
- Does not cause tooth staining (unlike CHX)
- Suitable for long-term daily use
- Reduces plaque and gingivitis
Limitations
- Less potent than chlorhexidine
- Lower substantivity
- Can be inactivated by anionic surfactants in toothpaste
- Some formulations have alcohol content
Quality of Evidence
Moderate evidence from multiple RCTs and systematic reviews supporting modest plaque and gingivitis reduction.
Key Clinical Takeaways
- 1Good option for long-term daily use when CHX is not appropriate
- 2Less effective than CHX but more practical for maintenance
- 3Best used as part of a comprehensive home care routine
Evidence Meter
Several clinical studies support use, but evidence has some limitations in design or consistency.
Frequently Asked Questions
References
Cetylpyridinium chloride mouthrinses: A systematic review
Haps S et al. (2008)
DOI: 10.1902/jop.2006.060150Efficacy of CPC mouthwash on plaque and gingivitis: A meta-analysis
Witt J et al. (2006)
DOI: 10.14219/jada.archive.2006.0232Organisms Studied with This Therapy
Related Therapies
Educational use only. This page provides general information and does not recommend this therapy over others or provide medical advice. Always consult a licensed dental or medical professional for diagnosis and treatment decisions.