Clinical trial Recruiting at 1 site Interventional Ages 18 to 70

Adding laser-based antimicrobial therapy to deep cleaning and tongue scraping for bad breath in people with type 2 diabetes and severe gum disease

Official title: Effects of Periodontal Treatment Associated With Antimicrobial Photodynamic Therapy on Halitosis in Patients With Diabetes Mellitus: A Randomized Clinical Trial

Run by University of Sao Paulo · NCT07463859 · Data updated 2026-11-12

This trial tests whether adding antimicrobial photodynamic therapy to standard deep cleaning and tongue scraping reduces bad breath in people with type 2 diabetes and advanced periodontitis.

Quick facts

Study typeInterventional
Ages18 Years to 70 Years
SexAll
Enrollment32 (estimated)
SponsorUniversity of Sao Paulo
Academic / other
Locations1 site (Bauru, São Paulo)
StatusRecruiting
StartedApril 2, 2026
Main results expectedJanuary 31, 2027
Study endsFebruary 28, 2027
Registry record updatedMarch 16, 2026
Trial IDNCT07463859 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults with type 2 diabetes (per WHO 2019 criteria), stage 3 or 4 periodontitis, at least 20 remaining teeth, no periodontal treatment in the prior 12 months, and who meet the study's non-smoking and health criteria.

Probably not a fit

People who smoke, are alcohol-dependent, are pregnant or lactating, have renal disease, use medications that affect the periodontium, or who do not have advanced periodontitis or have fewer than 20 teeth are not good candidates and are unlikely to benefit from this protocol.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

Participants receive conventional periodontal treatment (scaling and root planing) plus tongue scraping, and some participants also receive antimicrobial photodynamic therapy (aPDT) using methylene blue and a light source. Treatments are given weekly for one month, followed by monthly maintenance visits up to six months. Researchers will compare breath odor measurements and periodontal health outcomes between the groups to see if aPDT provides additional benefit. The trial is conducted at the Bauru School of Dentistry, University of Sao Paulo.

Why it matters

Potential benefit: If successful, adding aPDT could further reduce bad breath and improve gum health for people with diabetes and severe periodontitis.

How similar studies have gone: Previous small trials of aPDT as an adjunct to conventional periodontal therapy have shown promising but mixed results, so the approach has some supportive evidence but is not yet definitive.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patients diagnosed with type 2 diabetes mellitus according to the 2019 WHO criteria
* Stage 3 or 4 periodontitis
* No periodontal treatment in the previous 12 months
* a minimum of 20 remaining teeth.

Exclusion Criteria:

* Smokers
* Alcohol-dependent individuals
* Pregnant or lactating women
* Patients with renal disorders
* Patients using medications that affect the periodontium

Where it's running

  • Bauru School of Dentistry
    Bauru, São Paulo, Brazil
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.