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%

High intake of sweets vs Lower/less intake of sweets

Dental caries · Primary school children in Ethiopia

A high intake of sweets was associated with higher odds of dental caries (OR 2.71, 95% CI 1.968-3.451; ungraded).

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)

Gtf activity · Streptococcus mutans (in vitro cultures and biofilms)

One study reported grape seed extract inhibits S. mutans Gtf activity (ungraded).

1 finding from 1 review

Fluoride-releasing primers/adhesives (Opal Seal; Clearfil Protect Bond) vs Conventional/control orthodontic adhesive (e.g., Transbond XT) or negative control

Enamel demineralization (DIAGNOdent score) · Patients undergoing fixed orthodontic (fixed appliance) treatment (adolescents and adults, ages 12 to 35)

Across three small non-randomized studies, fluoride-releasing primers (Opal Seal, Clearfil) showed no consistent clinical advantage over conventional primers in preventing white spot lesions (ungraded).

1 finding from 1 review

Orthodontic adhesive containing quaternary ammonium resin monomer + 40% n-ACP vs Conventional/control orthodontic adhesive (e.g., Transbond XT) or negative control

Calcium and phosphate ion release · Human enamel specimens around orthodontic brackets (in vitro)

In vitro, an n-ACP-containing adhesive significantly increased calcium and phosphate ion release up to 42 days in a single study (ungraded).

1 finding from 1 review

Higher number of lost teeth (per one additional lost tooth) vs One fewer missing tooth

Malignant transformation (oral cancer development) · Adults in case-control studies (oral cancer patients vs healthy controls)

The number of missing teeth (per tooth) was not significantly associated with oral cancer (OR 0.96, 95% CI 0.92-1.01); ungraded.

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)

Antioxidant capacity · Streptococcus mutans (in vitro cultures and biofilms)

One study reported high antioxidant capacity of grape seed extract (ungraded).

1 finding from 1 review

Breastfeeding <18 months vs Breastfeeding for ≥18 months

Early childhood caries (ECC) · Preschool children (<6 years)

Breastfeeding for <18 vs ≥18 months was associated with significantly fewer caries (RR 0.41, 95% CI 0.18-0.92; substantial heterogeneity; ungraded).

2 findings from 1 review

Disability (developmental, intellectual, or sensory) vs Persons without disabilities

Dental caries prevalence and severity · Persons with disabilities (children and adults with autism, Down syndrome, cerebral palsy, hearing impairment, or multiple disabilities)…

Dental caries prevalence and severity are high among persons with disabilities in Saudi Arabia (60% to over 80%), and the one comparative autism study reported significantly higher caries than controls; synthesized narratively (ungraded).

1 finding from 1 review

Opal Seal fluoride-releasing primer vs Conventional Transbond XT primer

Bracket (bond) failure · Orthodontic patients of any age with fixed braces (new DLs assessed at debond)

Opal Seal showed no difference in bracket failure, with certainty not graded.

1 finding from 1 review

Prenatal vitamin D deficiency (maternal 25(OH)D measured at gestational weeks 24 to 38) vs Adequate prenatal vitamin D (sufficient maternal 25(OH)D)

Dental caries in children · Infants and children (aged about 2 to 8 years) whose mothers' vitamin D status was assessed during pregnancy

For prenatal vitamin D measured across gestational weeks 24-38, the OR of dental caries was 1.30 (no CI reported); ungraded.

1 finding from 1 review

Silver diamine fluoride (SDF) vs Nano-silver fluoride (NSF; with or without green tea extract)

Caries arrestment at the individual (patient) level · Children and adults with active dental caries (aged 1-50; mostly preschool/school children with primary dentition)

Pooling two trials, nano-silver fluoride achieved higher individual-level caries arrestment than SDF (OR 0.39 favoring the comparator; ungraded subgroup).

1 finding from 1 review

AA+AG genotypes vs GG genotype

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

FokI(rs2228570) dominant model: AA+AG vs GG was not significantly associated with dental caries (OR 1.07); ungraded.

1 finding from 1 review

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

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

After mandibular first molar extraction, the second premolar was rotated in about 60% of cases (2 studies; very imprecise; not GRADE-rated).

1 finding from 1 review