NCT07585682

Brief Summary

This study evaluates the effectiveness of different message framings used to encourage uptake of preventive dental check-ups. Patients will be randomized to receive one of several WhatsApp messages offering a full preventive dental check-up, which vary in message length and in how the benefits of the check-up are described.

Trial Health

55
Monitor

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Trial has exceeded expected completion date
Enrollment
100,000

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Jan 2026

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
active not recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

January 22, 2026

Completed
4 days until next milestone

Study Start

First participant enrolled

January 26, 2026

Completed
1 month until next milestone

Primary Completion

Last participant's last visit for primary outcome

February 28, 2026

Completed
2 months until next milestone

Study Completion

Last participant's last visit for all outcomes

May 1, 2026

Completed
13 days until next milestone

First Posted

Study publicly available on registry

May 14, 2026

Completed
Last Updated

May 14, 2026

Status Verified

January 1, 2026

Enrollment Period

1 month

First QC Date

January 22, 2026

Last Update Submit

May 6, 2026

Conditions

Preventive Oral Health

Keywords

Behavioral ScienceText MessagesPatient Outreach

Outcome Measures

Primary Outcomes (1)

  • Preventive Dental appointment scheduling

    Whether the patient schedules a preventive dental check-up

    Within 7 days of receiving the WhatsApp message

Secondary Outcomes (3)

  • Preventive Dental appointment attendance

    Within 30 days of receiving the WhatsApp message

  • Interest in scheduling

    Within 7 days of receiving the WhatsApp message

  • Any dental appointment scheduling

    Within 7 days of receiving the WhatsApp message

Study Arms (4)

Basic Outreach Message

ACTIVE COMPARATOR

Basic dental appointment message

Behavioral: Basic dental appointment message

Expanded Neutral Outreach Message

EXPERIMENTAL

Expanded neutral dental appointment message

Behavioral: Expanded neutral dental appointment message

Expanded Generic Benefit Outreach Message

EXPERIMENTAL

Expanded generic benefit dental appointment message

Behavioral: Expanded generic benefit dental appointment message

Expanded Specific Benefit Outreach Message

EXPERIMENTAL

Expanded specific benefit dental appointment message

Behavioral: Expanded specific benefit dental appointment message

Interventions

Basic dental appointment messageBEHAVIORAL

Patients receive a short WhatsApp message encouraging them to schedule a preventive dental check-up

Basic Outreach Message
Expanded neutral dental appointment messageBEHAVIORAL

Patients receive an expanded WhatsApp message encouraging them to schedule a preventive dental check-up, which adds neutral words to the Basic Outreach Message without introducing new information.

Expanded Neutral Outreach Message
Expanded generic benefit dental appointment messageBEHAVIORAL

Patients receive an expanded WhatsApp message encouraging them to schedule a preventive dental check-up, emphasizing general benefits of doing so.

Expanded Generic Benefit Outreach Message
Expanded specific benefit dental appointment messageBEHAVIORAL

Patients receive one of four expanded WhatsApp messages encouraging them to schedule a preventive dental check-up that highlights specific benefits related to dental health or appearance, with patients randomly assigned to one of the four variants.

Expanded Specific Benefit Outreach Message

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Patients aged 18 and above
  • Have a valid mobile phone number that can receive WhatsApp messages, recorded in the hospital network's patient database
  • Attended a non-dental medical appointment the day before the intended contact day OR have a non-dental medical appointment within the week after the intended contact day
  • Have not been contacted in the past two months about preventive dental checkups
  • Have not attended a dental appointment at the hospital network in the past 6 months
  • Note: The partnering clinic agreed to run the study until a concurrent experiment registered at NCT07121673 is finished. The investigators aim to reach 100,000 patients by then, but the final sample size will vary depending on the actual outreach efforts by the end of the study period.

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Partnering clinic network

Santiago, Chile

Location

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
DOUBLE
Who Masked
PARTICIPANT, CARE PROVIDER
Purpose
HEALTH SERVICES RESEARCH
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

January 22, 2026

First Posted

May 14, 2026

Study Start

January 26, 2026

Primary Completion

February 28, 2026

Study Completion

May 1, 2026

Last Updated

May 14, 2026

Record last verified: 2026-01

Data Sharing

IPD Sharing
Will not share

IPD will not be shared due to restrictions in the data use agreement with the partnering clinic network, which prohibits public dissemination of patient-level data.

Locations

CL(1)