Findings

What do systematic reviews say?

8 questions · 8 findings · 2 reviews · Other oral health

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No studies found 0 · 0%GRADE not reported 7 · 87.5%Very low 0 · 0%Low 1 · 12.5%Moderate 0 · 0%High 0 · 0%

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The findings closest to your search, judged one by one by TypeSafe's Jev model.

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- Community and primary care based maternal oral health interventions vs Usual antenatal care or no structured oral health intervention · Preterm birth (<37 weeks)
  Effectiveness of community and primary-care-based maternal oral health interventions on pregnancy and infant outcomes:… 2026 All outcomes
  At birth · Antenatal, primary care and community settings
  RR 0.80 [0.60, 1.05]
  2 studies
  Low
Related
- Preterm birth (PTB) group vs Term birth (TB) group · Oral microbiome alpha diversity (Shannon index)
  The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
  Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sensitivity analysis: Wan et al. conversion of summary statistics
  MD 1.07 [-0.48, 2.62]
  4 studies · 296 participants
  GRADE not reported
Related
- Preterm birth (PTB) group vs Term birth (TB) group · Oral microbiome alpha diversity (Shannon index)
  The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
  Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sensitivity analysis: Hozo et al. conversion of summary statistics
  MD 0.98 [-0.43, 2.38]
  4 studies · 296 participants
  GRADE not reported
Related
- Preterm birth (PTB) group vs Term birth (TB) group · Oral microbiome alpha diversity (Shannon index)
  The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
  Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Geographic region: Asia
  MD 0.28 [-0.00, 0.56]
  3 studies · 200 participants
  GRADE not reported
Related
- Preterm birth (PTB) group vs Term birth (TB) group · Oral microbiome alpha diversity (Shannon index)
  The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
  Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sample site: saliva
  MD 0.16 [-0.22, 0.53]
  2 studies · 114 participants
  GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

Shannon diversity did not differ significantly between preterm and term birth (certainty not rated).

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing
MD 1.09 [-0.55, 2.73]
4 studies · 296 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

In saliva samples Shannon diversity did not differ between preterm and term birth.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sample site: saliva
MD 0.16 [-0.22, 0.53]
2 studies · 114 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

In V3-V4 studies Shannon diversity did not differ significantly, with very high heterogeneity.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Amplified 16S rRNA region: V3-V4
MD 1.37 [-0.83, 3.57]
3 studies · 242 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

In subgingival plaque Shannon diversity did not differ significantly, with very high heterogeneity.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sample site: subgingival plaque
MD 2.02 [-1.1, 5.15]
2 studies · 182 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

Sensitivity analysis with Wan conversion gave a similar non-significant difference.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sensitivity analysis: Wan et al. conversion of summary statistics
MD 1.07 [-0.48, 2.62]
4 studies · 296 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

In Asian studies Shannon diversity did not differ significantly between preterm and term birth.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Geographic region: Asia
MD 0.28 [-0.00, 0.56]
3 studies · 200 participants
GRADE not reported

Preterm birth (PTB) group vs Term birth (TB) group

Oral microbiome alpha diversity (Shannon index) · Pregnant women

Sensitivity analysis with Hozo conversion gave a similar non-significant difference.

1 finding from 1 review

The role of oral dysbiosis in pregnancy complications: a systematic review and meta-analysis of preterm birth. 2026 All outcomes
Oral samples (saliva or subgingival plaque), 16S rRNA sequencing · Sensitivity analysis: Hozo et al. conversion of summary statistics
MD 0.98 [-0.43, 2.38]
4 studies · 296 participants
GRADE not reported

Community and primary care based maternal oral health interventions vs Usual antenatal care or no structured oral health intervention

Preterm birth (<37 weeks) · Pregnant women and postpartum mothers

Maternal oral health interventions may reduce preterm birth, but the pooled RCT estimate was not statistically significant (low certainty).

1 finding from 1 review

Effectiveness of community and primary-care-based maternal oral health interventions on pregnancy and infant outcomes:… 2026 All outcomes
At birth · Antenatal, primary care and community settings
RR 0.80 [0.60, 1.05]
2 studies
Low