Peppermint Oil's Potential to Fight Harmful Oral Bacteria and Protect Teeth

Greg Howard
11th July, 2024

Peppermint Oil's Potential to Fight Harmful Oral Bacteria and Protect Teeth

Peppermint (Mentha × piperita)

Photo adapted from: Terry Instone / CC BY (Source)

Key Findings

  • Researchers at the Universidade Federal de Santa Maria found that Mentha piperita essential oil (MPEO) significantly reduced bacterial biofilm caused by Streptococcus mutans
  • MPEO was effective in both eradicating preformed biofilms and inhibiting new biofilm formation at low concentrations
  • The study showed that MPEO did not produce cell toxicity in human keratinocytes, suggesting it is safe for use in dental care products
Dental caries, commonly known as tooth decay, is a widespread oral disease affecting billions of people worldwide. It occurs due to the breakdown of the tooth surface caused by the metabolic activity of bacteria in biofilms. These biofilms, composed of exopolysaccharides and proteins, protect bacteria like Streptococcus mutans, which is notorious for its role in tooth decay due to its acid-producing abilities. Traditional antimicrobial agents used to prevent biofilm formation often come with side effects such as enamel erosion and taste disturbances. A recent study conducted by researchers at the Universidade Federal de Santa Maria aimed to explore the potential of Mentha piperita essential oil (MPEO) as an antibiofilm agent against S. mutans[1]. The study found that MPEO significantly reduced bacterial biofilm, exhibited a synergistic effect when combined with chlorhexidine, and did not induce cell toxicity. Chemical analysis identified menthol and menthone as the primary components of MPEO, constituting approximately 42% and 26%, respectively. The study showed that MPEO could eradicate preformed biofilms and inhibit biofilm formation at sub-inhibitory concentrations. It also interfered with bacterial quorum sensing, a communication mechanism that bacteria use to coordinate their activities. Importantly, MPEO did not produce any apparent cell toxicity in immortalized human keratinocytes (HaCaT), making it a promising alternative for combating S. mutans and biofilm formation. Additionally, the potential combination of MPEO with chlorhexidine could help minimize the side effects associated with traditional antimicrobial agents. This study's findings align with previous research on the antimicrobial properties of MPEO. For instance, another study demonstrated the effectiveness of MPEO when loaded into chitosan nanogel (MPEO-CNs) against S. mutans biofilms[2]. The MPEO-CNs showed a significant inhibitory action against genes involved in biofilm synthesis, suggesting that MPEO could be effectively used in dental formulations such as toothpaste or mouthwash. Furthermore, the current study's findings are supported by earlier research on the antibacterial activity of essential oils (EOs). A systematic review highlighted the potential of various EOs, including Mentha piperita, for their antibacterial properties against cariogenic bacteria like S. mutans[3]. This review emphasized the importance of further non-clinical and clinical studies to explore the applicability of EOs in novel dental formulations. Interestingly, the study also noted that MPEO did not exhibit significant cell toxicity in non-cancerous cell lines, which is consistent with findings from another study that investigated the cytotoxic effects of MPEO and Rosmarinus officinalis essential oil (R_EO) in colorectal cancer cells[4]. The lack of significant cytotoxicity in non-cancerous cells suggests that MPEO is safe for use in dental care products. Overall, the study conducted by the Universidade Federal de Santa Maria provides valuable insights into the potential use of MPEO as an antibiofilm agent against S. mutans. The findings suggest that MPEO could be an effective and safe alternative to traditional antimicrobial agents, with the added benefit of minimizing side effects when combined with chlorhexidine. Further in-situ performance assessments are required to confirm these results and pave the way for the development of new dental care formulations.

HerbsMedicineBiochem

References

Main Study

1) Chemical composition, cytotoxicity, antimicrobial, antibiofilm, and anti-quorum sensing potential of Mentha Piperita essential oil against the oral pathogen Streptococcus mutans.

Published 10th July, 2024

https://doi.org/10.1080/15287394.2024.2375731

Related Studies

2) Mentha piperita essential oils loaded in a chitosan nanogel with inhibitory effect on biofilm formation against S. mutans on the dental surface.

https://doi.org/10.1016/j.carbpol.2019.02.018

3) Antibacterial Activity of Essential Oils and Their Isolated Constituents against Cariogenic Bacteria: A Systematic Review.

https://doi.org/10.3390/molecules20047329

4) Chemical and Antimicrobial Characterization of Mentha piperita L. and Rosmarinus officinalis L. Essential Oils and In Vitro Potential Cytotoxic Effect in Human Colorectal Carcinoma Cells.

https://doi.org/10.3390/molecules27186106


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