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Showing 1–24 of 54 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Oral Microbiota Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Black Raspberry Phytochemicals on Oral Microbiome in Current Smokers and Non-smokers

NCT02439255
View directory record Official record
Conditions
Healthy Subject, Tobacco Use Disorder
Interventions
Laboratory Biomarker Analysis, Phytochemical, Placebo, Screening Questionnaire Administration
Other · Dietary Supplement
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years to 50 Years
Enrollment
148 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2022
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 4, 2022 · Synced Jun 27, 2026, 2:23 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Oral Fecal Microbiota Transplant Feasibility Study in Alzheimer's Disease

NCT03998423
View directory record Official record
Conditions
Alzheimer Disease
Interventions
Fecal Microbiota Transplant
Biological
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
45 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 23, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional

The Oral Microbiome in OSCC

NCT04925700
View directory record Official record
Conditions
Oral Cancer
Interventions
ProDentis Lozenge, Placebo Lozenge
Dietary Supplement · Other
Lead sponsor
University of Iowa
Other
Eligibility
21 Years to 89 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Nov 17, 2023 · Synced Jun 27, 2026, 2:23 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Biogeography of the Oral Microbiome

NCT05672953
View directory record Official record
Conditions
Oral Microbiome
Interventions
Not listed
Lead sponsor
Viome
Industry
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Jan 4, 2023 · Synced Jun 27, 2026, 2:23 AM EDT
Completed No phase listed Observational

Study of Variation Over Time in the Oral Microbiome

NCT02049398
View directory record Official record
Conditions
Microbiota, Oral Health, Body Mass Index
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 26, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of a Probiotic Water on Oral Health in Adults

NCT04473404
View directory record Official record
Conditions
Oral Bacteria, Halitosis
Interventions
Streptococcus salivarius DB-B5 - 2 billion CFU/day, Streptococcus salivarius DB-B5 - 10 billion CFU/day, Placebo
Dietary Supplement · Other
Lead sponsor
Dose Biosystems Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Fort Wayne, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 3, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Orthodontic Varnish Microbiology Study

NCT04528134
View directory record Official record
Conditions
Dental Caries, Dental Plaque, Dental White Spot
Interventions
Extended Contact RMGI (Resin-modified Glass Ionomer) Varnish, 5% Sodium Fluoride Varnish
Device
Lead sponsor
University of California, Los Angeles
Other
Eligibility
12 Years to 27 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 10, 2025 · Synced Jun 27, 2026, 2:23 AM EDT
Recruiting Phase 1Phase 2 Interventional

Nisin in Oral Cavity Squamous Cell Carcinoma (OCSCC)

NCT06097468
View directory record Official record
Conditions
Oral Cavity Squamous Cell Carcinoma
Interventions
NisinZ® P, Surgery (non-interventional, standard of care)
Drug · Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Phase 1 Interventional

Effects of Nystatin Suspension Oral Application on Oral Microbial Community

NCT04550546
View directory record Official record
Conditions
Dental Caries
Interventions
Nystatin
Drug
Lead sponsor
University of Rochester
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 14, 2022 · Synced Jun 27, 2026, 2:23 AM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Periodontal Inflammation and Epigenetics in Obese Individuals

NCT07610902
View directory record Official record
Conditions
Obesity, Periodontitis
Interventions
Non-surgical periodontal therapy will be administered
Procedure
Lead sponsor
Louisiana State University Health Sciences Center in New Orleans
Other
Eligibility
18 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Phase 1 Interventional

Livionex Oral Microbiome and Dental Plaque Control in HSCT Recipients

NCT02617407
View directory record Official record
Conditions
Dental Plaque
Interventions
Livionex® Dental Gel, PreviDent 5000 plus/Tom's of Maine Children's toothpaste, Kolibree Toothbrush
Drug · Device
Lead sponsor
University of California, San Francisco
Other
Eligibility
Not listed
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Sep 22, 2024 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Phase 1 Interventional

Safety of FMT Using Oral Encapsulated PRIM-DJ2727 in HIV

NCT03329560
View directory record Official record
Conditions
HIV-1-infection
Interventions
Oral fecal microbiota transplantation
Biological
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years and older · Male only
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 26, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Fecal Microbiota Transplantation to Treat Recurrent C. Difficile Associated Diarrhea Via Retention Enema or Oral Route

NCT02449174
View directory record Official record
Conditions
C. Difficile
Interventions
Frozen Microbiota, Lyophilized Microbiota
Biological
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years and older
Enrollment
69 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 24, 2019 · Synced Jun 27, 2026, 2:23 AM EDT
Terminated Phase 3 Interventional Results available

A Trial of CP101 for the Prevention of Recurrent CDI (PRISM4)

NCT05153499
View directory record Official record
Conditions
Recurrent C. Difficile Infection
Interventions
CP101, Placebo
Biological · Other
Lead sponsor
Finch Research and Development LLC.
Industry
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
61
States / cities
Phoenix, Arizona • Mission Hills, California • Oakland, California + 51 more
Source: ClinicalTrials.gov public record
Updated Nov 12, 2023 · Synced Jun 27, 2026, 2:23 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cigarette Smoking and Oral Microbiota

NCT01862809
View directory record Official record
Conditions
Microbiota, Lung Cancer, Oral Cancer
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
25 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2020
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 29, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Efficacy of VRx MyBiotics Oral Lozenges

NCT05972330
View directory record Official record
Conditions
Oral Microbiome Health
Interventions
VRx MyBiotics Oral Lozenges
Dietary Supplement
Lead sponsor
Viome
Industry
Eligibility
18 Years and older
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Bothell, Washington
Source: ClinicalTrials.gov public record
Updated Feb 11, 2024 · Synced Jun 27, 2026, 2:23 AM EDT
Terminated Phase 2 Interventional Results available

Dose Ranging Study of the Safety and Efficacy of Orally Administered Lyophilized Fecal Microbiota Product (PRIM-DJ2727) for the Treatment of Recurrent Clostridium Difficile Infection (CDI)

NCT03298048
View directory record Official record
Conditions
Recurrent C. Difficile Infection
Interventions
Low fecal microbiota dose, Mid fecal microbiota dose, High fecal microbiota dose
Biological
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 100 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 5, 2020 · Synced Jun 27, 2026, 2:23 AM EDT
Terminated Early Phase 1 Interventional

Refined Fecal Microbiota Transplantation (FMT) for Ulcerative Colitis (UC)

NCT04968951
View directory record Official record
Conditions
Ulcerative Colitis, FMT, Fecal Microbiota Transplant
Interventions
Metronidazole, Placebo, Vancomycin, Fecal Microbiota Transplantation
Drug · Biological
Lead sponsor
Ari M Grinspan
Other
Eligibility
18 Years to 75 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 25, 2024 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Mouthwashes on Oral Wound Healing and Microbiome

NCT05270382
View directory record Official record
Conditions
Wound Heal, Oral Microbiome
Interventions
cetylpyridinium chloride
Other
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years to 45 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Feb 21, 2024 · Synced Jun 27, 2026, 2:23 AM EDT
Recruiting Phase 2 Interventional

Evaluating the Safety and Efficacy of Oral Encapsulated Microbiota Transplantation Therapy in Peanut Allergic Patients

NCT05695261
View directory record Official record
Conditions
Allergy, Peanut, Peanut Allergy, Peanut Hypersensitivity, Peanut-Induced Anaphylaxis, Food Allergy, Food Allergy Peanut
Interventions
Microbial Transplantation Therapy, Antibiotic, Placebo (in place of MTT), Placebo (in place of antibiotics), Oral Immunotherapy (OIT)
Biological · Drug · Other
Lead sponsor
Rima Rachid
Other
Eligibility
12 Years to 17 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 23, 2025 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Early Phase 1 Interventional

Impact of Probiotics on Oral Microbiota in Older Adults With Dysphagia

NCT03682094
View directory record Official record
Conditions
Dysphagia
Interventions
VSL#3
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
65 Years to 99 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 15, 2024 · Synced Jun 27, 2026, 2:23 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comprehensive Multi-omics Characterization and Implications of Non-Pharmaceutical Dental Hygiene Product in a Randomized Controlled Large Population Study.

NCT07451782
View directory record Official record
Conditions
Basic Science, Intervention Studies, Biomarker Discovery
Interventions
Oral Lozenges (Tradename pHossident), Water additive (Tradename Protektin)
Dietary Supplement
Lead sponsor
Delta Dental of Minnesota Foundation
Other
Eligibility
18 Years to 80 Years
Enrollment
595 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Jun 27, 2026, 2:23 AM EDT
Recruiting Phase 2 Interventional

Evaluation the Safety and Efficacy of Lyophilized Fecal Microbiota Transplantation Administered Orally for Prevention of Relapse or Intestinal Inflammation in Adults With Ulcerative Colitis

NCT04373473
View directory record Official record
Conditions
Adults With Ulcerative Colitis
Interventions
PRIM-DJ2727, Placebos
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years and older
Enrollment
58 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 8, 2026 · Synced Jun 27, 2026, 2:23 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Oral Microbiome and Pancreatic Cancer

NCT03302637
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
16S rRNA gene sequencing assay
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
55 Years to 74 Years
Enrollment
732 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1992 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 5, 2017 · Synced Jun 27, 2026, 2:23 AM EDT