Probiotic effects on a gum-disease bacterium remain uncertain in people
Laboratory studies suggested that some Lactobacillus strains affect a bacterium linked to gum disease, but trials in healthy volunteers and people with periodontal disease had mixed results.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
In studies involving healthy volunteers and people with gum disease, Lactobacillus probiotics sometimes reduced the amount of Porphyromonas gingivalis, a bacterium linked to periodontal disease, but other trials found no positive effect. Laboratory and animal results were more favorable. The review therefore leaves the clinical value of adding these probiotics to treatment uncertain.
The abstract does not specify trial comparators, treatment duration or effect sizes. It emphasizes differences between strains and calls for human studies to verify effects and establish safety.
Laboratory findings versus people
Laboratory studies reported effects on bacterial growth, biofilms—communities of bacteria attached to surfaces—and inflammation-related measures. Animal studies also reported changes in bacterial load and bone loss. These results need verification in the human mouth.
Why the strain matters
A strain is a particular variant within a bacterial species. The authors emphasize that effects are strain-specific, so evidence about one Lactobacillus strain cannot establish the same effect for all probiotics.
The original publication
The Effect of Probiotic Lactobacillus Strains on Porphyromonas gingivalis, the Etiological Factor of Periodontal Diseases-A Systematic Review.
Kamianowski C, Kamianowski A, Nikitiuk J et al.
Probiotics Antimicrob Proteins · 2026
- PubMed ID
- 40736667
- Record checked
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