Synopsis

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

Lactobacillus reuteri has been studied for its potential role in supporting gum (periodontal) health. Several randomized controlled trials and systematic reviews have examined its effects, particularly in the context of periodontal diseases such as gingivitis and periodontitis. L. reuteri is thought to benefit oral health by inhibiting the growth of pathogenic bacteria, modulating the local immune response, and reducing inflammation in the gums.

A number of clinical studies have shown that the use of L. reuteri, either as a probiotic supplement or in lozenge form, can reduce markers of gum inflammation, such as bleeding on probing and gingival index scores. For example, a 2017 meta-analysis in Journal of Oral Microbiology found that L. reuteri supplementation led to significant improvements in gingival health compared to placebo, though the magnitude of effect was moderate and dependent on study design and population.

While the precise mechanisms remain under investigation, L. reuteri appears to compete with pathogenic bacteria like Porphyromonas gingivalis and produce antimicrobial substances such as reuterin, which may help rebalance the oral microbiome. However, not all studies are consistent, and some show only modest benefits. Overall, there is moderate scientific support for the use of L. reuteri in supporting gum health, but it should not be considered a substitute for standard dental care.

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