Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

239 questions · 315 findings · 44 reviews

No studies found 0 · 0%GRADE not reported 284 · 90.2%Very low 16 · 5.1%Low 8 · 2.5%Moderate 7 · 2.2%High 0 · 0%

Postbiotic products (postbiotic toothpaste; heat-killed/postbiotic oral lozenges; inactivated-bacteria tablets) vs Placebo, fluoride toothpaste, or standard post-filling care (varies by trial)

Streptococcus mutans count · Humans at risk of dental caries (children aged 6-12 years; adults with dental caries)

Postbiotic products reduce salivary S. mutans counts in human trials, though not always significantly (ungraded narrative synthesis).

1 finding from 1 review
  • Postbiotics and Dental Caries: A Systematic Review. 2025 All outcomes
    Daily for 14 days to 4 weeks · Clinical; salivary/plaque sampling
    Three RCTs reported reduced salivary S. mutans counts after postbiotic intervention; the reduction was statistically significant in Lin 2022 but non-significant in Basir 2022; no pooled estimate.
    3 studies
    GRADE not reported

Silver diamine fluoride (SDF) vs Other methods (pooled: ART/glass ionomer cement, nano-silver fluoride, sodium fluoride varnish, placebo)

Adverse effects (tooth staining and other side effects) · Children and adults with active dental caries (aged 1-50; mostly preschool/school children with primary dentition)

SDF commonly causes black staining of arrested lesions; only mild, transient adverse events were reported, with no major adverse events (ungraded).

1 finding from 1 review

38% SDF (indirect pulp capping) vs Resin-modified glass ionomer cement (RMGIC)

Secondary prevention of caries · children with deep occlusal carious lesions in permanent molars

No significant difference in secondary caries prevention was reported; no effect estimate or GRADE rating was reported.

1 finding from 1 review

38% SDF plus potassium iodide (KI) (indirect pulp capping) vs Resin-modified glass ionomer cement (RMGIC)

Secondary prevention of caries · children with deep occlusal carious lesions in permanent molars

No significant difference in secondary caries prevention was reported; no effect estimate or GRADE rating was reported.

1 finding from 1 review

38% SDF (every 6 months) vs no treatment

Inactive (arrested) carious lesions on permanent first molars · Children with dental caries in permanent (first) molars

Six-monthly SDF produced significantly more inactive (arrested) lesions than no treatment in children's permanent molars (0.3 vs 0.1; p<0.05; ungraded).

1 finding from 1 review

Antimicrobial photodynamic therapy (PDT) vs No photodynamic therapy (untreated negative control)

Microbial reduction (viable count, log CFU/mL) · Patients with dental caries (in vivo cariogenic microorganisms, including children with early childhood caries)

In randomized clinical trials, photodynamic therapy significantly reduced cariogenic microbial counts versus untreated control (SMD -1.16, 95% CI -2.02 to -0.30; 2 trials), but heterogeneity was high (I2=70%) and considered too high to rely on; certainty was not graded.

1 finding from 1 review

Breastfeeding for more than 24 months vs Not breastfed at the same age or breastfed for a shorter duration

Early childhood caries (ECC) - incidence/risk · Children with exclusively primary dentition (age ≤71 months)

Breastfeeding beyond 24 months is associated with an increased risk (incidence) of early childhood caries versus not breastfeeding at the same age (RR 2.44, 95% CI 1.97 to 3.02; low certainty).

1 finding from 1 review

Silver diamine fluoride (SDF, including SDF + fluoride varnish) vs Other standard-of-care caries treatments pooled (placebo, ART, or ART + fluoride varnish)

Oral health-related quality of life · Children with dental caries

SDF had no significant effect on oral health-related quality of life versus pooled standard-of-care caries treatments (SMD -0.06, 95% CI -0.20 to 0.08; ungraded).

1 finding from 1 review

38% SDF (indirect pulp capping) vs Resin-modified glass ionomer cement (RMGIC)

Restoration color, marginal staining and luster (esthetics) · Children with deep occlusal caries in young permanent first molars (indirect pulp capping)

RMGIC gave significantly better restoration esthetics than SDF, which caused black staining (p=0.03; ungraded).

1 finding from 1 review

38% SDF every 12 months vs water every 12 months

new carious lesions or fillings at fissure-site level · children with caries in permanent molars

SDF had a 52% preventative fraction at fissure-site level; no pooled estimate or GRADE rating was reported.

1 finding from 1 review

Resin-based fissure sealant vs Fluoride varnish

DMFS (decayed, missing, filled surfaces) increment, occlusal surfaces · Schoolchildren aged 6-12 years with sound occlusal surfaces of the first permanent molars

Pit and fissure sealant and fluoride varnish showed no statistically significant difference in DMFS increment at 24 months (SMD -0.13, 95% CI -0.67 to 0.40; I2=92%; not GRADE-rated).

1 finding from 1 review

Atraumatic restorative treatment vs placebo

Oral health-related quality of life · Children with dental caries

ART and placebo did not differ for oral health-related quality of life, based on an indirect network estimate with no direct trials (MD -0.01, 95% CI -0.40 to 0.38; ungraded).

3 findings from 1 review