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Oven heat and smoke may darken gums: can workplace fixes stop it?

NCT ID NCT07805824

Disease control Sponsor: Salah M. Ibrahim Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 04, 2026 · Last updated Sep 04, 2026

Summary

This trial tests whether a workplace safety package can lower heat and air pollution exposure for restaurant workers who spend hours near ovens and grills, and whether that reduces changes in gum coloring. About 200 adults across 20 restaurants will take part, with restaurants randomly assigned to receive the package immediately or after 24 weeks. The package includes better ventilation, equipment maintenance, heat shielding, and scheduled rest and hydration. Researchers will measure gum color, air quality, and biological markers at the start and again at 12 and 24 weeks to see if the intervention makes a difference.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Workplace heat and air pollution mitigation package including engineering controls (ventilation, hoods, equipment maintenance, heat shielding) and administrative controls (work-rest-hydration schedules, task rotation, education, respiratory protection)
What this could lead to
If effective, this package could reduce occupational heat and smoke exposure and limit related gum pigmentation changes, potentially informing workplace safety standards.
What could go wrong
This is a cluster randomized trial with 200 workers, so results may not apply broadly. The intervention's effect on gum color may be small or influenced by other factors, and the study does not test long-term health outcomes.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

200 people

The number who actually took part.

Started

Jan 2026

Finished

Jun 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 60 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Inclusion criteria 1. Adults aged 18-60 years. 2. Employment in an eligible restaurant for at least six months. 3. At least 20 work hours per week. 4. At least 10 work hours per week within approximately five meters of active cooking or combustion equipment. 5. Expected continued employment for the 24-week follow-up period. 6. Ability to provide written informed consent. Restaurant-level eligibility requires use of ovens, grills, fryers, charcoal, wood, gas, or comparable high-temperature equipment; at least six potentially eligible workers; permission for exposure monitoring and engineering assessment; and no scheduled closure or major renovation during follow-up. Exclusion criteria 7. Recent gingival depigmentation. 8. Active oral pigmented lesion requiring diagnostic referral. 9. Severe untreated periodontitis or acute oral infection. 10. Medication known to alter pigmentation, including antimalarials, minocycline, or chemotherapeutic agents. 11. Systemic disease judged likely to cause pathological pigmentation. 12. Current chemotherapy. 13. Inability to undergo standardized photography. 14. Pregnancy if venipuncture or heat-strain procedures create additional risk. 15. Inability to provide informed consent. 16. Restaurants with an imminent mandatory ventilation replacement that would compromise the comparator condition. Exclusion Criteria:

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Gingival pigmentation Occupational air pollution exposure Occupational heat exposure

Contacts and locations

Locations

  • the University of Kufa

    Najaf, Najaf, 5300, Iraq

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