Cannabinoids Showed Antibacterial Activity Against Bacteria That Cause Persistent Root Canal Infections | Research

The takeaway

CBD, CBN, and THC all demonstrated antibacterial effects against bacteria responsible for persistent root canal infections, including both planktonic bacteria and the harder-to-treat biofilm form, suggesting potential as novel endodontic treatments.

Endodontists, dental researchers, and microbiologists studying novel antimicrobial approaches.

What the researchers found

CBD, CBN, and THC showed antibacterial efficacy against E. faecalis, S. mutans, and F. nucleatum — bacteria central to persistent endodontic infections. Both planktonic bacteria and biofilms were affected. Minimum inhibitory and bactericidal concentrations were determined for each cannabinoid-bacteria combination.

Why it matters

Root canal treatment failures are often caused by bacteria that resist standard medicaments and form protective biofilms. With growing antibiotic resistance, cannabinoids could offer an entirely new class of antimicrobial agents for dental infections.

The numbers in context

Three cannabinoids tested: CBD, CBN, THC. Three bacteria: E. faecalis, S. mutans, F. nucleatum. Positive control: 3% sodium hypochlorite. Both planktonic and biofilm forms tested. MIC and MBC determined for each combination.

How the study worked

In vitro testing of CBD, CBN, and THC against planktonic bacteria and biofilms of E. faecalis, S. mutans, and F. nucleatum (key endodontic pathogens). Negative control (no exposure), positive control (3% NaOCl), and experimental cannabinoid groups. MIC and MBC determined.

What this study cannot tell us

In vitro study — conditions differ from the root canal environment. Concentrations achievable in root canals during treatment unknown. Comparison to standard endodontic medicaments limited to NaOCl. No human clinical testing. Biofilm penetration in complex canal anatomy untested.

How to read the evidence

In vitro antibacterial testing with appropriate controls and dose-response data, but no clinical translation yet.

When this study was published

Published 2025.

The bigger picture

Cannabinoids' antibacterial properties are increasingly recognized across multiple infection types. The dental application is particularly compelling because root canal infections are localized, potentially allowing targeted cannabinoid delivery without systemic effects.

Questions still open

Could cannabinoid-based intracanal medicaments replace or complement calcium hydroxide? Would combination treatment (cannabinoid + standard medicament) be more effective? What is the optimal delivery system for cannabinoids in root canals?

Common questions

Could cannabis replace antibiotics for dental infections?

This is very early laboratory research. While CBD, CBN, and THC killed bacteria that cause root canal infections, significant development is needed before cannabinoid-based dental treatments could be available clinically.

Which cannabinoid was most effective against dental bacteria?

The abstract indicates all three (CBD, CBN, THC) showed efficacy, with MIC and MBC values determined for each. Specific comparisons of relative potency would require the full study data.

Read the original research

Antibacterial Effect of Cannabinoids on Bacteria Associated with Persistent Endodontic Infections.

International journal of molecular sciences, 26(24)

View on PubMed ↗Publisher’s paper ↗

Citation

Wieczerza, Cassandra; Zhai, Haoyan; Askar, Mazin; Zhou, Zheng; Paurazas, Susan. (2025). Antibacterial Effect of Cannabinoids on Bacteria Associated with Persistent Endodontic Infections.. International journal of molecular sciences, 26(24). https://doi.org/10.3390/ijms262411936