Hydrogen-Infused Powder Kills Harmful Oral Bacteria and Prevents Biofilm
- Authors
- Kanta Sato, Minato Akizuki, Raras Ajeng Enggardipta, Rie Kido, Yuji Inagaki, Tomoko Sumitomo, Keiki Nambu, Hiromichi Yumoto
- Journal
- Journal of Applied Microbiology
- Year
- 2026
- DOI
- 10.1093/jambio/lxag209
- Study Type
- Cell Culture
- Outcome
- Positive
- Peer Reviewed
- Yes
- Country
- Japan
- Health Condition
- Periodontal disease
- Body System
- Oral and dental system
TL;DR
Immobilized hydrogen significantly reduced three major oral pathogens and disrupted E. faecalis biofilms in laboratory experiments, suggesting potential as an antibacterial dental material.
Key Finding
Hydrogen-loaded calcium carbonate powder killed all three tested oral pathogens and reduced the protective biofilms they form, including lowering the activity of biofilm-related genes in Enterococcus faecalis.
Summary
This lab study tested whether hydrogen gas — released slowly from a coral calcium carbonate powder — could kill harmful bacteria found in the mouth. Researchers exposed three types of oral bacteria (including ones linked to gum disease and cavities) to this "immobilized hydrogen" material and measured how well it killed the bacteria and disrupted their biofilms (protective layers bacteria form to resist treatment). All three hydrogen suspensions tested significantly reduced bacterial survival and weakened biofilm formation.
Practical Takeaway
This early lab study suggests that hydrogen delivered via a solid powder material may have antibacterial properties relevant to oral health, but the research was conducted only on bacterial cultures in a lab setting — not in humans or animals. It is too soon to draw conclusions about whether hydrogen water or similar products would produce the same effects in the mouth.
Abstract
Aims: Hydrogen, a colorless and odorless gas, possesses various physiological activities, including anti-inflammatory, antibacterial, antioxidant, anti-cancer, and anti-apoptotic effects. Clinical applications of hydrogen have been investigated in the medical field. However, few studies have focused on hydrogen use in dentistry and its clinical applications have not yet progressed. This study aimed to evaluate the antibacterial and antibiofilm efficacies of hydrogen-loaded coral calcium carbonate powder (immobilized hydrogen) against oral pathogenic bacteria. Methods and results: Three immobilized hydrogen suspensions (TU-A, -B, and -C) and three pathogenic oral bacteria (Porphyromonas gingivalis, Streptococcus mutans, and Enterococcus faecalis) were used. The direct and indirect antibacterial effects of immobilized hydrogen were evaluated by counting the colony-forming units. The biofilm-related gene expression levels in E. faecalis were analyzed using real-time RT-PCR. The antibacterial activity of the bacteria in the biofilm was observed under a fluorescence microscope after live/dead staining. All immobilized hydrogen suspensions significantly reduced the survival rates of the three oral bacteria, significantly increased the proportion of dead bacteria in the biofilm, and significantly decreased the biofilm-related gene expression levels in E. faecalis. Conclusions: This study highlights the potential of immobilized hydrogen as a novel antibacterial material, owing to its antibacterial and antibiofilm activities against pathogenic oral bacteria.