Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Lactobacillus salivarius is a probiotic bacterium naturally found in the human oral cavity, including saliva and dental plaque. Its use in supporting gum (periodontal) health is primarily justified by emerging scientific evidence, though studies are still relatively limited and often small in scale. Several clinical trials and in vitro studies have shown that L. salivarius can help reduce markers of gum inflammation, decrease levels of pathogenic bacteria such as Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans, and improve clinical outcomes such as bleeding on probing and gingival index scores. The proposed mechanisms include competitive inhibition of harmful bacteria, production of bacteriocins, and modulation of the host immune response within the oral cavity.

For example, a randomized controlled trial published in the Journal of Clinical Periodontology (2009) found that subjects who consumed L. salivarius-containing tablets for eight weeks had significant reductions in plaque and gingival inflammation compared to placebo. Other studies have reported similar improvements in oral microbial balance and periodontal indices. However, the body of evidence is not yet robust, with studies varying in quality, strain specificity, and duration. More large-scale, well-designed trials are needed to confirm these results and clarify the optimal dosage and delivery method.

In summary, there is moderate scientific evidence supporting the use of L. salivarius to support gum health, but the field is still evolving.

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