Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

224 questions · 272 findings · 31 reviews · Dental caries

No studies found 23 · 8.5%GRADE not reported 170 · 62.5%Very low 64 · 23.5%Low 6 · 2.2%Moderate 9 · 3.3%High 0 · 0%

Micro-invasive treatment (proximal sealing or resin infiltration): resin sealant, glass ionomer sealant, polyurethane/adhesive patch, or resin infiltration vs Non-invasive / control treatment

Adverse events · Dentate children and adults with non-cavitated proximal caries lesions extending into enamel or dentine (not pulp) in primary or permanent…
1 finding from 1 review

Micro-invasive treatment (proximal sealing or resin infiltration): resin sealant, glass ionomer sealant, polyurethane/adhesive patch, or resin infiltration vs Non-invasive / control treatment

Change in decayed, missing and filled (DMF/dmf) figures at surface, tooth and whole mouth level · Dentate children and adults with non-cavitated proximal caries lesions extending into enamel or dentine (not pulp) in primary or permanent…

The review found no eligible studies for this question.

1 finding from 1 review

Micro-invasive treatment (proximal sealing or resin infiltration): resin sealant, glass ionomer sealant, polyurethane/adhesive patch, or resin infiltration vs Non-invasive / control treatment

Material deficiency (retention/adaptation loss; re-treatment) · Dentate children and adults with non-cavitated proximal caries lesions extending into enamel or dentine (not pulp) in primary or permanent…
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

Lactobacillus-derived postbiotics vs Not specified

Virulence-gene expression related to adhesion acid production and exopolysaccharide synthesis · Cariogenic bacteria (mainly Streptococcus mutans reference strains) and oral biofilms in vitro

No meta-analysis was conducted; the narrative synthesis reported reduced expression of Streptococcus mutans virulence genes.

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

Cariogenic and commensal oral bacteria (S. mutans and commensal streptococci growth, adhesion, biofilm) · Oral bacteria (streptococci), dental hard tissue (enamel/dentin) and e-liquids studied in vitro/ex vivo (with a few clinical microbiome…

Most in vitro studies indicate e-cigarette aerosol/e-liquid (especially flavored/high-concentration) disrupts normal oral flora and favors cariogenic S. mutans growth and biofilm, plausibly increasing caries risk; not pooled (ungraded, narrative).

1 finding from 1 review

Grape seed extract (GSE) and its proanthocyanidin fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Bacterial adhesion (inhibition) · Streptococcus mutans (in vitro cultures and biofilms)

Grape seed extract inhibits S. mutans adhesion to hydroxyapatite in vitro (2 studies; ungraded).

1 finding from 1 review

Cranberry extract or cranberry flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Bacterial adhesion or initial colonization · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; three included studies reported reduced adhesion or initial colonization with cranberry extract or fractions.

1 finding from 1 review

Cranberry extract / juice and proanthocyanidin (flavonoid) fractions vs Untreated or vehicle control (some studies vs positive antimicrobial controls, e.g. chlorhexidine/fluoride)

Bacterial adhesion (inhibition) · Streptococcus mutans (in vitro cultures and biofilms)

Cranberry extract inhibits S. mutans adhesion / initial colonization in vitro (3 studies; ungraded).

1 finding from 1 review

Grape seed extract or grape seed flavonoid fractions vs No extract or vehicle control; other antimicrobial agents

Bacterial adhesion · Streptococcus mutans (in vitro cultures and biofilms)

No meta-analysis was conducted; two included studies reported reduced Streptococcus mutans adhesion with grape seed extract or fractions.

1 finding from 1 review

Malocclusion vs No malocclusion

Impaired OHRQoL measured with CPQ 11-14 (quantitative synthesis / meta-analysis) · Adolescents (10-19 years)

Malocclusion (DAI) probably increases the prevalence of impaired OHRQoL (CPQ 11-14) by about 15% in adolescents (RR/PR 1.15, 95% CI 1.12-1.18; moderate certainty).

1 finding from 1 review

Gum chewing (sugar-free) vs No chewing gum

Salivary flow rate · Elderly (>60 years) and medically compromised adults with xerostomia / dry mouth

Across 19 studies the effect of gum chewing on stimulated and/or unstimulated salivary flow rate was mixed (9 positive, 10 no effect); this broad outcome was not meta-analyzed.

1 finding from 1 review

Malocclusion vs No malocclusion

Poor oral health-related quality of life (OHRQoL) · Adolescents (10-19 years)

Malocclusions probably have a negative effect on OHRQoL in adolescents, after adjustment for confounders (moderate certainty).

1 finding from 1 review

Laser (Er:YAG, Er,Cr:YSGG, or Nd:YAG) vs Conventional mechanical caries removal (standard drill; handpiece with a bur)

Need for anaesthesia · Children, adolescents and adults with caries in deciduous and permanent teeth (age 3.5 to 84 years)

Laser (Er:YAG, Er,Cr:YSGG, or Nd:YAG) led to lower need for anaesthesia compared with conventional mechanical caries removal (standard drill; handpiece…; GRADE not reported.

2 findings from 1 review

Primary school-based behavioural intervention (both oral hygiene and dietary components) vs No treatment (or delayed treatment)

Behavioural outcomes (reported and/or other measures, e.g. data tracking toothbrushes and collecting food wrappers) · Children aged 4 to 12 years attending primary school

The review found no eligible studies for this question.

1 finding from 1 review

Experimental orthodontic composite containing nano-hydroxyapatite (n-HAP) vs Conventional/control orthodontic adhesive (e.g., Transbond XT) or negative control

Enamel surface microhardness · Human enamel specimens around orthodontic brackets (in vitro)

In vitro, a nano-hydroxyapatite-containing orthodontic composite showed significant enamel remineralization versus control in a single study (ungraded).

1 finding from 1 review

Antibacterial S. mutans reduction only in Farzanegan (chitosan+TiO2); Mollabashi (TiO2-only) showed no significant antibacterial effect - not attributable to TiO2 alone vs Conventional/control orthodontic adhesive (e.g., Transbond XT) or negative control

Streptococcus mutans count · Patients undergoing fixed orthodontic (fixed appliance) treatment (adolescents and adults, ages 12 to 35)

The antibacterial (S. mutans) effect of TiO2 nanoparticles was conflicting across two RCTs (ungraded).

1 finding from 1 review

Light-cured resin-modified glass ionomer cement vs Resin adhesive

First-time bracket failure · Orthodontic patients of any age with fixed braces (new DLs assessed at debond)

Resin-modified glass ionomer cement showed no difference in first-time bracket failure, with certainty not graded.

1 finding from 1 review

Transbond XT with 1% chitosan and 1% TiO2 nanoparticles vs Conventional/control orthodontic adhesive (e.g., Transbond XT) or negative control

Streptococcus mutans count · Orthodontic patients of any age with fixed braces (new DLs assessed at debond)

Chitosan and TiO2 adhesive reduced S. mutans counts, with certainty not graded.

1 finding from 1 review