Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,323 questions · 5,762 findings · 263 reviews · Dental caries

No studies found 321 · 5.6%GRADE not reported 4,450 · 77.2%Very low 455 · 7.9%Low 297 · 5.2%Moderate 200 · 3.5%High 39 · 0.7%

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2.26% ammonium bifluoride (one-time) vs Control (details reported as unavailable)

New coronal caries in permanent first molars (caries prevention) · Children with dental caries in permanent (first) molars

One-time ammonium bifluoride gave a 56% prevented fraction, similar to SDF (57%) (single study; ungraded).

1 finding from 1 review

Surgery vs Radiotherapy alone

Adverse events associated with treatment · Adults with oropharyngeal cancer
1 finding from 1 review

Dental (tooth) agenesis vs No dental agenesis

Oral health-related quality of life · Adolescents (10-19 years)

The umbrella review reported insufficient scientific evidence to support an association between dental agenesis and oral health-related quality of life.

2 findings from 1 review

Growth stunting (linear growth retardation, low height-for-age) vs Children without growth stunting (normal height-for-age)

Early childhood caries (ECC) · Children aged ≤6 years (early childhood)

One Nigerian cross-sectional study reported a significant adjusted association between nutritional (stunting) status and ECC (APR 0.14, 95% CI 0.03-0.69); ungraded.

4 findings from 1 review
Show 1 more finding

Traumatic dental injury (dental trauma) vs No dental trauma

Oral health-related quality of life · Adolescents (10-19 years)

Complicated traumatic dental injuries (pulp exposure or tooth darkening) worsen OHRQoL in adolescents, while uncomplicated injuries show little impact (narrative synthesis; no pooled estimate or GRADE rating).

1 finding from 1 review
  • Oral-health-related quality of life in adolescents: umbrella review. 2023 All outcomes
    Community/school/clinic settings; adolescents 10-19 years; included reviews conducted in multiple countries
    The impact of dental trauma sequelae on OHRQoL in adolescents was observed in five systematic reviews [31-35]. The studies show that uncomplicated traumatic injuries do not have a negative impact on the OHRQoL of…
    5 studies
    GRADE not reported

Composite resin vs Glass ionomer cement (GIC)

Secondary caries · Patients requiring dental restoration; permanent teeth

Over 1 year in permanent teeth, resin composite showed no statistically significant difference in secondary caries versus GIC (RR 3.05, 95% CI 0.95-9.79; low certainty).

2 findings from 1 review

Herbal mouthwash vs placebo

Plaque · People undergoing orthodontic treatment (any age; 9 to 34 years in included studies)

Herbal mouthwash reduced some plaque-related indices versus placebo, with low-certainty evidence.

1 finding from 1 review

Fluoride mouthwash vs Blank control

Cariogenic bacteria (Mutans streptococci) · People undergoing orthodontic treatment (any age; 9 to 34 years in included studies)

Short-term fluoride mouthwash reduced Mutans streptococci, but certainty is very low.

2 findings from 1 review

Chlorhexidine mouthwash vs Placebo mouthwash

Probing pocket depth (PPD/PD) · Orthodontic patients (any age) undergoing orthodontic treatment (mostly fixed appliances)

Chlorhexidine mouthwash may reduce pocket probing depth versus placebo in the short term (low certainty).

1 finding from 1 review

Clear aligners (Invisalign / thermoformed aligners) vs Conventional orthodontic appliance treatment

White spot lesion incidence · Orthodontic patients undergoing comprehensive treatment (late mixed or permanent dentition, no active caries)

Most studies reported a lower incidence of white spot lesions with clear aligners than fixed appliances, but heterogeneous assessment methods precluded meta-analysis (ungraded).

1 finding from 1 review

Pre-operative caries fillings or crowns vs Intact teeth

Pulp necrosis · Vital teeth

One study reported a 13% incidence in teeth with pre-operative caries fillings or crowns.

2 findings from 1 review

Carious dentin vs Sound dentin

MMP-9 presence/activity · Human ex vivo carious dentin (mostly coronal), natural caries lesions

MMP-9 may be increased in carious dentin compared with sound dentin, but the evidence is very uncertain (very low certainty).

1 finding from 1 review

Elective radical (comprehensive) neck dissection vs Elective selective neck dissection

Total mortality · Adults with oral cavity cancer
1 finding from 1 review