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%

Bleaching gel with added remineralising agent (fluoride, calcium, or CPP-ACP) vs Bleaching alone (no remineralising agent)

Enamel mineral loss / remineralisation · Demineralised / white-spot-lesion enamel (in vitro specimens)

Low-quality in vitro evidence indicates that adding fluoride, calcium or CPP-ACP to bleaching agents can reduce enamel mineral loss (ungraded).

1 finding from 1 review

Intervention not reported

Dental caries in primary teeth · Children (primary dentition) worldwide

In the Americas, the pooled prevalence of primary-teeth caries in children was 45.8% (95% CI 34.2 to 58.0); certainty not graded.

1 finding from 1 review

Surgically induced or chronic acid gastroesophageal reflux (experimental) vs Non-reflux control animals

Dental erosion, alveolar bone destruction and oral/pharyngeal lesions · Rat models with surgically induced or chronic acid gastroesophageal reflux

In experimental rat models, induced gastroesophageal reflux caused dental erosion, alveolar bone destruction and oral lesions compared with controls, supporting biological plausibility; evidence is ungraded animal research.

1 finding from 1 review

Intraglandular botulinum neurotoxin (BoNT) injection vs No BoNT (placebo or pre-treatment baseline)

Salivary buffering capacity · Patients with drooling (sialorrhea) due to neurological disease

Salivary buffering capacity did not decrease after BoNT; one of two quasi-experimental studies reported a significant increase (ungraded; no effect estimate reported).

1 finding from 1 review
  • Oral health effects of botulinum toxin treatment for drooling: a systematic review. 2020 All outcomes
    Before vs after BoNT injection (2018 study: significant buffering increase at 1 month; 2017 study no change) · Neurological-disease populations with drooling (e.g., cerebral palsy, Parkinson disease, adults with sialorrhea); specialist clinical care
    The quasi-experimental studies of Tiigimae-Saar found different results concerning the changes in buffering capacity. For the analysis carried out in 2017, no statistically significant change was observed. By contrast,…
    2 studies
    GRADE not reported

Orthodontic treatment need vs No orthodontic treatment need

Poor oral health-related quality of life (OHRQoL) · Children aged 3-12 years

Orthodontic treatment need was associated with modestly higher odds of poor OHRQoL (OR 1.13, 95% CI 1.07-1.18; 3 studies; ungraded).

1 finding from 1 review

Intervention not reported

Dental caries in primary teeth · Children (primary dentition) worldwide

The pooled worldwide prevalence of dental caries in primary teeth in children was 46.2% (95% CI 41.6 to 50.8), with very high heterogeneity (I2=99.2%); certainty not graded.

1 finding from 1 review

GERD/NERD vs Healthy individuals without reflux (controls)

Oral mucosa inflammation (gingivitis, periodontitis, mucosal lesions) · Adults with gastroesophageal reflux disease (GERD) or laryngopharyngeal reflux (LPR)

The association between reflux and oral mucosa inflammation (gingivitis/periodontitis) is inconsistent across five studies and remains ungraded.

1 finding from 1 review