Research Article

Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay

Volume: 10 Number: 1 February 8, 2026
TR EN

Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay

Abstract

Tooth decay is one of the most prevalent infectious diseases and mouthwashes play a crucial role in combating it. Given the adverse effects of chemical mouthwashes and the growing popularity of herbal alternatives, this study aims to investigate the impact of alfalfa root extract on Streptococcus mutans, the primary bacteria responsible for tooth decay. The study’s findings were compared with those of chlorhexidine, a standard chemical mouthwash. Alfalfa roots were processed and extracted using the maceration technique. The extract's effect on S. mutans proliferation was assessed through Disk Diffusion and Well Diffusion assays, with chlorhexidine as a standard for comparison. The study also determined the alfalfa extract’s Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC). Alfalfa extract showed dose-dependent antimicrobial activity, with inhibition zones at ≥62.5 mg/mL in disk diffusion and ≥31.25 mg/mL in well diffusion. Inhibition zones increased significantly from 24 to 48 hours at higher concentrations (p < 0.05). At ≥250 mg/mL, alfalfa produced larger zones than chlorhexidine (p < 0.05), with comparable effects at 125 mg/mL. The MIC was 31.2 mg/mL and MBC was 62.5 mg/mL indicating bacteriostatic and bactericidal effects. Alfalfa root extract shows significant antimicrobial activity against S. mutans, comparable to chlorhexidine at higher concentrations. It is a promising foundation for creating an effective, low-cost mouthwash to combat dental caries with minimal side effects. Further clinical studies are needed to fully understand the extract's impact on tooth decay.

Keywords

Supporting Institution

Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Project Number

Project NO. 1401/59500 From Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Ethical Statement

All the experimental procedures in this study were approved by the Research Ethics Committee of Vice-Chancellor in Research Affairs - Shahid Beheshti University of Medical Sciences, Tehran, Iran (ethical code: IR.SBMU.RETECH.REC.1401.798).

Thanks

This study is related to the project NO. 1401/59500 From Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran. We also appreciate the “Student Research Committee” and “Research & Technology Chancellor” in Shahid Beheshti University of Medical Sciences for their financial support of this study.

References

  1. Abouzeid, S., Beutling, U., Elekhnawy, E., & Selmar, D. (2023). Antibacterial and antibiofilm effects of allelopathic compounds identified in Medicago sativa L. seedling exudate against Escherichia coli. Molecules, 28(6), 2645. https://doi.org/10.3390/molecules28062645
  2. Abuzenada, B.M., Pullishery, F., Elnawawy, M.S.A., Alshehri, S.A., Alostath, R.M.B., Bakhubira, B.M., … & Al-Sanabani, F. (2021). Complementary and alternative medicines in oral health care: An integrative review. Journal of Pharmacy & Bioallied Sciences, 13(2), S892–S897. https://doi.org/10.4103/jpbs.jpbs_92_21
  3. Ancuceanu, R., Anghel, A.I., Ionescu, C., Hovaneț, M.V., Cojocaru-Toma, M., & Dinu, M. (2019). Clinical trials with herbal products for the prevention of dental caries and their quality: A scoping study. Biomolecules, 9(12), 884. https://doi.org/10.3390/biom9120884
  4. Avato, P., Bucci, R., Tava, A., Vitali, C., Rosato, A., Bialy, Z., … & Caboni, M.F. (2006). Antimicrobial activity of saponins from Medicago sp.: Structure–activity relationship. Phytotherapy Research, 20(6), 454–457. https://doi.org/10.1002/ptr.1876
  5. Azwanida, N.N. (2015). A review on the extraction methods use in medicinal plants, principle, strength and limitation. Medicinal & Aromatic Plants, 4(3), 196. https://doi.org/10.4172/2167-0412.1000196
  6. Bakhtiar, Z., Hassandokht, M., Fallah, M., Rezadoost, H., & Mirjalili, M.H. (2025). Oil content, fatty acids profile, phenolic compounds and biological activity of the seeds from wild Medicago species growing in Iran.
  7. Chemical and Biological Technologies in Agriculture, 12(1), 40. https://doi.org/10.1186/s40538-025-00758-2 Bauer, A.W., Kirby W.M., Sherris, J.C., & Turck, M. (1966). Antibiotic susceptibility testing by a standardized single disk method. American Journal of Clinical Pathology, 45(4), 493–496. https://doi.org/10.1093/ajcp/45.4_ts.493
  8. Buzzanca, C., D’Amico, A., Gabrielli, P., Durazzo, A., Lucarini, M., & Di Stefano, V. (2025). Alfalfa (Medicago sativa L.): Literature quantitative research analysis. Natural Product Research, 1–10. https://doi.org/10.1080/14786419.2025.2486335

Details

Primary Language

English

Subjects

Bacteriology

Journal Section

Research Article

Publication Date

February 8, 2026

Submission Date

August 9, 2025

Acceptance Date

January 7, 2026

Published in Issue

Year 2026 Volume: 10 Number: 1

APA
Jafari Toudeshki, F., Chegni, H., Mahmoudpour, F., Rezvanianzadeh, S., & Abdollahi, F. (2026). Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay. Commagene Journal of Biology, 10(1). https://doi.org/10.31594/commagene.1759401
AMA
1.Jafari Toudeshki F, Chegni H, Mahmoudpour F, Rezvanianzadeh S, Abdollahi F. Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay. Comm. J. Biol. 2026;10(1). doi:10.31594/commagene.1759401
Chicago
Jafari Toudeshki, Fatemeh, Hamid Chegni, Fatemeh Mahmoudpour, Sana Rezvanianzadeh, and Farzaneh Abdollahi. 2026. “Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus Mutans, Primary Contributor to Tooth Decay”. Commagene Journal of Biology 10 (1). https://doi.org/10.31594/commagene.1759401.
EndNote
Jafari Toudeshki F, Chegni H, Mahmoudpour F, Rezvanianzadeh S, Abdollahi F (February 1, 2026) Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay. Commagene Journal of Biology 10 1
IEEE
[1]F. Jafari Toudeshki, H. Chegni, F. Mahmoudpour, S. Rezvanianzadeh, and F. Abdollahi, “Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay”, Comm. J. Biol., vol. 10, no. 1, Feb. 2026, doi: 10.31594/commagene.1759401.
ISNAD
Jafari Toudeshki, Fatemeh - Chegni, Hamid - Mahmoudpour, Fatemeh - Rezvanianzadeh, Sana - Abdollahi, Farzaneh. “Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus Mutans, Primary Contributor to Tooth Decay”. Commagene Journal of Biology 10/1 (February 1, 2026). https://doi.org/10.31594/commagene.1759401.
JAMA
1.Jafari Toudeshki F, Chegni H, Mahmoudpour F, Rezvanianzadeh S, Abdollahi F. Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay. Comm. J. Biol. 2026;10. doi:10.31594/commagene.1759401.
MLA
Jafari Toudeshki, Fatemeh, et al. “Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus Mutans, Primary Contributor to Tooth Decay”. Commagene Journal of Biology, vol. 10, no. 1, Feb. 2026, doi:10.31594/commagene.1759401.
Vancouver
1.Fatemeh Jafari Toudeshki, Hamid Chegni, Fatemeh Mahmoudpour, Sana Rezvanianzadeh, Farzaneh Abdollahi. Comparing the Effects of Alfalfa Root Extract and Chlorhexidine on Streptococcus mutans, Primary Contributor to Tooth Decay. Comm. J. Biol. 2026 Feb. 1;10(1). doi:10.31594/commagene.1759401