Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,745 questions · 4,389 findings · 203 reviews · Oral Health

No studies found 39 · 0.9%GRADE not reported 3,844 · 87.6%Very low 198 · 4.5%Low 137 · 3.1%Moderate 134 · 3.1%High 37 · 0.8%

CC+AA (homozygous) genotypes vs CA (heterozygous) genotype

Dental caries · Children (<18 years) with vs without dental caries

ApaI(rs7975232) over-dominant model: CC+AA vs CA was not significantly associated with dental caries (OR 0.91); ungraded.

1 finding from 1 review

Age 8-10 years vs Extraction at patient age >10 years

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, extraction at age 8-10 (vs after 10) increases odds of space closure (OR 3.32; low certainty).

1 finding from 1 review

Slum / urban-disadvantaged setting vs Non-slum urban setting

Oral disease prevalence · Adult residents of slums and non-slum urban settings of LMICs

Oral disease prevalence was generally high and worse in slum settings where compared, but no meta-analysis was conducted.

1 finding from 1 review

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

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

No meta-analysis was conducted; seven included studies reported inhibition of Streptococcus mutans growth with cranberry extract or fractions.

1 finding from 1 review

Higher waist circumference vs Lower waist circumference

Dental caries in children · Children (approx. 4-18 years)

Waist circumference was not significantly associated with childhood dental caries (pooled OR 1.08, 95% CI 0.90 to 1.30; I2=47.7%); ungraded.

1 finding from 1 review

Adhesive precoated (APC) flash-free brackets (minimal excess adhesive) vs Conventional brackets

White spot lesions assessed by laser fluorescence (DIAGNOdent) · Patients undergoing fixed orthodontic (fixed appliance) treatment (adolescents and adults, ages 12 to 35)

Two studies found adhesive flash-free brackets did not clinically reduce enamel demineralization or white spot lesions versus conventional brackets, though they reduced pathogenic bacteria (ungraded).

1 finding from 1 review

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

Teledentistry (index test): dental caries diagnosis from photographs taken with DSLR or smartphone cameras; store-and-forward vs Visual or clinical examination

Negative predictive value · Children and adults with primary or permanent dentition undergoing dental caries assessment

Negative predictive value was reported in 10 studies and ranged widely across studies (about 31% to 99.5%); no pooled estimate and certainty not graded.

1 finding from 1 review

Slum / urban-disadvantaged setting vs Non-slum urban / general-urban / national population

Self-perceived (self-rated) oral health status · Adult residents of slums and non-slum urban settings of LMICs

Most participants perceive their oral health as satisfactory (one study 39%), more so among younger, male, higher-SES and employed people; ungraded.

1 finding from 1 review

Extraction of the mandibular permanent first molar vs Not applicable (single-group prevalence)

Rotation of the mandibular second permanent molar · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

After mandibular first molar extraction, the second molar was rotated in about 77% of cases (2 studies; very imprecise; not GRADE-rated).

1 finding from 1 review

Platelet-rich fibrin (PRF) graft vs Calcium hydroxide (CH)

Overall success (composite of clinical and radiographic success) · Mature permanent teeth with irreversible pulpitis and carious pulp exposure (treated with full pulpotomy)

Platelet-rich fibrin and calcium hydroxide showed no significant difference in success (ungraded; effect size not reported).

1 finding from 1 review

Probiotics vs placebo or control

Streptococcus mutans count · Children and/or adolescents (<18 years) without background systemic disease

Probiotics probably reduce Streptococcus mutans count versus control (MD -0.40 CFU/mL, 95%CI -0.57 to -0.24; moderate certainty).

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 growth inhibition · Streptococcus mutans (in vitro cultures and biofilms)

Grape seed extract inhibits S. mutans growth in vitro (MIC ~0.5 mg/mL to 250 mg/mL across 5 studies; ungraded).

1 finding from 1 review

Second molar at Demirjian stage E at extraction vs Second molar at Demirjian stage F-H at extraction

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, extraction at Demirjian stage E (vs later F-H) increases odds of space closure (OR 3.81; low certainty).

1 finding from 1 review