Localized prebiotic nitrate supplementation remodels oral biofilm metabolism and reduces gingival inflammation: a randomized placebo-controlled trial
Localized nitrate application for 21 days reduced bleeding on probing from 25.7% to 15.3% in adults with gingival inflammation.
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What the study showed
The trial reported a significant reduction in mean bleeding on probing (mBOP) and increased salivary nitrite levels in the nitrate group versus placebo. Microbiome analysis showed enrichment of nitrate-reducing taxa (Rothia mucilaginosa, Neisseria spp.) and a relative reduction of inflammation-associated genera. Oral pH also increased in the intervention group.
How it was done
Randomized, double-blind, placebo-controlled trial enrolling 30 adults with gingival bleeding, receiving localized prebiotic nitrate (~0.989 mmol/dose) or placebo for 21 days. Outcomes included mBOP, gingival index, plaque index, salivary nitrite, oral pH, and microbiome composition by 16S rRNA gene sequencing.
Risk of bias
Very small sample size (n=30) limits statistical power and generalizability. The abstract does not report complete data on reduced genera or safety outcomes; abstract-only access prevents evaluation of confounder control.
What this study does NOT prove
The study does not prove that nitrate supplementation prevents or treats periodontitis, nor that the observed microbial shifts persist after the intervention ends.
In clinical practice
The small sample requires caution before any clinical recommendation. Results are preliminary and require replication in larger, longer-duration studies.
Limitations
Very small sample size (n=30) limits statistical power and generalizability. The abstract does not report complete data on reduced genera or safety outcomes; abstract-only access prevents evaluation of confounder control.
Technical appendix
Version history
- 1.0 · 2026-07-29 — Auto-generated under Evidence Standard v1.0
Paid access: structured summary from public metadata; consult the original study at the source.