Findings

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Evidence found and GRADE certainty

4,587 questions · 5,761 findings · 495 reviews

No studies found 1,011 · 17.5%GRADE not reported 1,797 · 31.2%Very low 1,100 · 19.1%Low 1,052 · 18.3%Moderate 649 · 11.3%High 152 · 2.6%

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Surgical interventions (exploration and decompression / external neurolysis, internal neurolysis, neurorrhaphy / direct repair, neuroma excision, anastomosis, autologous or allograft nerve grafting or tubulization) vs conservative interventions

Resource use and other costs · Children and adolescents with femoral shaft fractures

The review found no eligible studies for this question.

1 finding from 1 review

Interferon-alpha (systemic) vs Placebo (subcutaneous)

Safety of the intervention (adverse effects) · People with Behcet's disease with a history of recurrent oral aphthous-type (RAS-type) ulcers diagnosed clinically; primary care
1 finding from 1 review
  • Alpsoy 2002: high rate of adverse events including alopecia, leukopenia, and diarrhoea; 18 of 23 patients in the treatment arm experienced mild flu-like symptoms.
    1 study · 50 participants
    GRADE not reported

Electronic cigarette use vs Non-smokers

Interleukin-8 (IL-8) · Humans who use e-cigarettes (mostly adults, often with periodontal disease) assessed for oral proinflammatory markers

Meta-analysis suggests no significant effect of e-cigarette use on the salivary level of Interleukin-8 (IL-8) (6 studies), though heterogeneity was high (I2=84%) and the pooled estimate appears only in Figure 3C (unavailable); GCF data were limited (1 study(ies)) (ungraded).

1 finding from 1 review

Electronic cigarette use vs Non-smokers

Interleukin-6 (IL-6) · Humans who use e-cigarettes (mostly adults, often with periodontal disease) assessed for oral proinflammatory markers

Meta-analysis suggests no significant effect of e-cigarette use on the salivary level of Interleukin-6 (IL-6) (6 studies), though heterogeneity was high (I2=95%) and the pooled estimate appears only in Figure 3D (unavailable); GCF data were limited (1 study(ies)) (ungraded).

1 finding from 1 review

Postbiotics from Lactobacillus spp. (cell-free supernatants, biosurfactants, lipoteichoic acid, bacterial lysates) vs No prior SDF application (untreated dentin control)

Downregulation of S. mutans virulence/biofilm gene expression (gtfB, gtfC, ftf) · Cariogenic bacteria (mainly Streptococcus mutans reference strains) and oral biofilms in vitro

Postbiotics reduce expression of S. mutans biofilm/virulence genes (gtfB, gtfC, ftf) in vitro (ungraded narrative synthesis).

1 finding from 1 review
  • Postbiotics and Dental Caries: A Systematic Review. 2025 All outcomes
    Exposure 24 h to 7 days · Laboratory (in vitro)
    Postbiotics downregulated expression of S. mutans virulence and exopolysaccharide-synthesis genes (e.g., gtfB, gtfC, gtfD, ftf) in 10 in vitro studies; no pooled estimate.
    8 studies
    GRADE not reported

Microinvasive techniques (resin infiltration, resin/GIC sealant, or glass ionomer varnish) vs Non-invasive measures (fluoride varnish/toothpaste, flossing, oral hygiene instruction, sham/standard of care)

Adverse events and periodontal/secondary outcomes (gingival bleeding, gingival bleeding index, visible plaque index) · Children and adults with non-cavitated proximal (interproximal) caries lesions in primary and/or permanent teeth (ages 3-45)

Only three trials reported secondary/adverse outcomes; no adverse events were attributed to microinvasive treatment and periodontal findings were mixed and not pooled (ungraded).

1 finding from 1 review

Resin infiltration vs Non-invasive measures (fluoride varnish/toothpaste, flossing, oral hygiene instruction, sham/standard of care)

Radiographic proximal caries lesion progression · Children and adults with non-cavitated proximal (interproximal) caries lesions in primary and/or permanent teeth (ages 3-45)

Pooling 10 trials, resin infiltration reduced radiographic proximal caries progression versus non-invasive measures (OR 0.23); this subgroup was not separately GRADE-rated.

1 finding from 1 review

Electronic cigarette use vs Non-smokers

Tumour necrosis factor-alpha (TNF-α) · Humans who use e-cigarettes (mostly adults, often with periodontal disease) assessed for oral proinflammatory markers

Meta-analysis suggests no significant effect of e-cigarette use on the salivary level of Tumour necrosis factor-alpha (TNF-α) (7 studies), though heterogeneity was high (I2=95%) and the pooled estimate appears only in Figure 3E (unavailable); GCF data were limited (2 study(ies)) (ungraded).

1 finding from 1 review

Postbiotics from Lactobacillus spp. (cell-free supernatants, biosurfactants, lipoteichoic acid, bacterial lysates) vs No prior SDF application (untreated dentin control)

Proposed inhibition of S. mutans adhesion to tooth surface (mechanism; direct adherence endpoint confirmed only in Ahn 2018) · Cariogenic bacteria (mainly Streptococcus mutans reference strains) and oral biofilms in vitro

Postbiotics inhibit S. mutans adhesion to tooth surfaces in vitro (ungraded narrative synthesis).

1 finding from 1 review
  • Postbiotics and Dental Caries: A Systematic Review. 2025 All outcomes
    Exposure 24 h to 7 days · Laboratory (in vitro)
    Postbiotics (mainly biosurfactants and lipoteichoic acid) interfered with S. mutans adhesion to tooth/hydroxyapatite surfaces in 5 in vitro studies; no pooled estimate.
    5 studies
    GRADE not reported

Electronic cigarette use vs Non-smokers

Combined salivary IL-1β, IL-6, IL-8, and TNF-α levels · Humans who use e-cigarettes (mostly adults, often with periodontal disease) assessed for oral proinflammatory markers

Combining all four salivary cytokines, the meta-analysis found no effect of e-cigarette use on salivary proinflammatory marker levels (low between-marker heterogeneity, I2=31%); the pooled estimate appears only in Figure 3F (unavailable) and is ungraded.

1 finding from 1 review

Electronic cigarette use vs Non-smokers

Interleukin-1 beta (IL-1β) · Humans who use e-cigarettes (mostly adults, often with periodontal disease) assessed for oral proinflammatory markers

Meta-analysis suggests no significant effect of e-cigarette use on the salivary level of Interleukin-1 beta (IL-1β) (11 studies), though heterogeneity was high (I2=97%) and the pooled estimate appears only in Figure 3B (unavailable); GCF data were limited (2 study(ies)) (ungraded).

1 finding from 1 review

E-cigarette aerosol / e-liquid exposure (flavored and unflavored; nicotine and non-nicotine) vs Unexposed controls / unflavored e-liquid / conventional cigarette smoke

Enamel/dental hard-tissue changes and e-liquid cariogenic properties (demineralization, colour change, pH, sugar content, metals) · Oral bacteria (streptococci), dental hard tissue (enamel/dentin) and e-liquids studied in vitro/ex vivo (with a few clinical microbiome…

In vitro evidence suggests e-liquids are often acidic and sugar-containing and can alter enamel/dentin colour and properties, supporting a plausible cariogenic effect, but findings are heterogeneous and not pooled (ungraded, narrative).

1 finding from 1 review

Postbiotics from Lactobacillus spp. (cell-free supernatants, biosurfactants, lipoteichoic acid, bacterial lysates) vs No prior SDF application (untreated dentin control)

Reduced enamel demineralization · Cariogenic bacteria (mainly Streptococcus mutans reference strains) and oral biofilms in vitro

A single in vitro study found postbiotics reduce enamel demineralization (ungraded).

1 finding from 1 review
  • Postbiotics and Dental Caries: A Systematic Review. 2025 All outcomes
    Exposure 24 h to 7 days · Laboratory (in vitro)
    One in vitro multispecies-biofilm study reported that a postbiotic (L. reuteri cell-free supernatant) reduced enamel demineralization, indicating a protective effect against caries; no pooled estimate.
    1 study
    GRADE not reported

Microinvasive techniques (resin infiltration or glass ionomer varnish) vs Non-invasive measures (fluoride varnish/toothpaste, flossing, oral hygiene instruction, sham/standard of care)

Radiographic proximal caries lesion progression · Children with non-cavitated proximal caries lesions in primary teeth (ages 3-9)

In primary teeth (5 trials), microinvasive techniques reduced radiographic proximal caries progression versus non-invasive measures (OR 0.38; ungraded subgroup).

1 finding from 1 review

Co-presence of Veillonella spp. with Streptococcus mutans vs Streptococcus mutans acidogenesis without Veillonella spp. modulation (conceptual)

Streptococcus mutans acid (lactic acid) production and cariogenic potential · Oral biofilm of children/individuals at risk of dental caries

The review concludes that Veillonella spp. may modulate (often inhibit) S. mutans acid production and compete for lactate substrate, potentially reducing cariogenesis, but the evidence is narrative and ungraded.

1 finding from 1 review

Microinvasive techniques (mostly resin infiltration; incl. resin sealant) vs Non-invasive measures (fluoride varnish/toothpaste, flossing, oral hygiene instruction, sham/standard of care)

Radiographic proximal caries lesion progression · Children and adults with non-cavitated proximal caries lesions in permanent teeth (ages 11-45)

In permanent teeth (7 trials), microinvasive techniques reduced radiographic proximal caries progression versus non-invasive measures (OR 0.18; ungraded subgroup).

1 finding from 1 review

Microinvasive techniques (resin infiltration, resin/GIC sealant, or glass ionomer varnish) vs Non-invasive measures (fluoride varnish/toothpaste, flossing, oral hygiene instruction, sham/standard of care)

Radiographic proximal caries lesion progression · Children and adults with non-cavitated proximal (interproximal) caries lesions in primary and/or permanent teeth (ages 3-45)

Microinvasive techniques probably reduce radiographic progression of non-cavitated proximal caries lesions compared with non-invasive measures (moderate certainty).

1 finding from 1 review