NCT07121673

Brief Summary

This study evaluates the effectiveness of behavioral messages sent via WhatsApp in encouraging patients to schedule preventive dental check-ups. Specifically, it examines how (1) prompting people to bundle the dental appointment with an existing medical visit and (2) price discounts influence scheduling behavior.

Trial Health

43
At Risk

Trial Health Score

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

Trial has exceeded expected completion date
Enrollment
320,000

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Aug 2025

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
not yet 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

July 30, 2025

Completed
2 days until next milestone

Study Start

First participant enrolled

August 1, 2025

Completed
12 days until next milestone

First Posted

Study publicly available on registry

August 13, 2025

Completed
3 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

November 1, 2025

Completed
2 months until next milestone

Study Completion

Last participant's last visit for all outcomes

January 1, 2026

Completed
Last Updated

August 13, 2025

Status Verified

July 1, 2025

Enrollment Period

3 months

First QC Date

July 30, 2025

Last Update Submit

August 6, 2025

Conditions

Cavities of Teeth

Keywords

Behavioral ScienceText MessagesPatient Outreach

Outcome Measures

Primary Outcomes (2)

  • Preventive Dental appointment scheduling

    Whether the patient schedules a preventive dental check-up

    Within 7 days of receiving the WhatsApp message

  • Preventive Dental appointment attendance

    Whether the patient attends a preventive dental check-up

    Within 30 days of receiving the WhatsApp message

Secondary Outcomes (4)

  • Same-Day Preventive Dental appointment scheduling

    Within 7 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

  • Medical appointment attendance

    Up to 7 days of receiving the Whatsapp message

Other Outcomes (6)

  • Dental appointment cancellation

    Within 90 days of receiving the Whatsapp message

  • Medical appointment cancellation

    Up to 90 days of receiving the Whatsapp message

  • Rescheduling of dental appointment

    Up to 90 days of receiving the Whatsapp message

  • +3 more other outcomes

Study Arms (5)

Holdout

NO INTERVENTION

Experimental: No Bundling - $19,990

EXPERIMENTAL

The message does not reference their existing medical appointment.

Behavioral: Dental appointment message

Experimental: Bundling - $19,990

EXPERIMENTAL
Behavioral: Dental appointment messageBehavioral: Bundling frame

Experimental: Bundling - $990

EXPERIMENTAL
Behavioral: Dental appointment message with price discountBehavioral: Bundling frame

Experimental: No Bundling - $990

EXPERIMENTAL

The message does not reference their existing medical appointment.

Behavioral: Dental appointment message with price discount

Interventions

Dental appointment messageBEHAVIORAL

Patients receive a WhatsApp message offering a preventive dental check-up for $19,990.

Experimental: Bundling - $19,990Experimental: No Bundling - $19,990
Dental appointment message with price discountBEHAVIORAL

Patients receive a WhatsApp message offering a preventive dental check-up for $990.

Experimental: Bundling - $990Experimental: No Bundling - $990
Bundling frameBEHAVIORAL

The message includes language indicating they can schedule the dental appointment on the same day as their upcoming medical appointment to save time.

Experimental: Bundling - $19,990Experimental: Bundling - $990

Eligibility Criteria

Age18 Years - 70 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Patients aged 18 to 70 years
  • Have a valid mobile phone number that can receive WhatsApp messages, recorded in the clinic network's patient database
  • Have a scheduled non-dental medical appointment between 1 and 7 days after the day the WhatsApp message is received
  • Have not attended a dental appointment at the clinical network in the past 6 months

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Partnering clinic network at Chile

Santiago, Chile

Location

MeSH Terms

Conditions

Dental Caries

Condition Hierarchy (Ancestors)

Tooth DemineralizationTooth DiseasesStomatognathic Diseases

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
DOUBLE
Who Masked
PARTICIPANT, CARE PROVIDER
Purpose
PREVENTION
Intervention Model
FACTORIAL
Model Details: This study employs Parallel Assignment with Nested Factorial Design Patients in this trial will be randomized in equal numbers to one of five conditions: One Holdout condition where patients do not receive any WhatsApp message or communications about dental check-ups, or one of four treatment conditions. The treatment conditions comprise a 2×2 factorial design: Bundling: Whether the message emphasizes the option to schedule the dental check-up on the same day as an already scheduled medical appointment Price: Whether the price offered is $990 or $19,990 CLP
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

July 30, 2025

First Posted

August 13, 2025

Study Start

August 1, 2025

Primary Completion

November 1, 2025

Study Completion

January 1, 2026

Last Updated

August 13, 2025

Record last verified: 2025-07

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)