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New study tests which retainer makes teeth whitening more comfortable

NCT ID NCT07208708

Symptom relief Sponsor: Universidad Rey Juan Carlos Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 Results may not be published yet.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)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at how satisfied people were with at-home tooth bleaching using two different types of orthodontic retainers. Forty adults who had finished Invisalign treatment used both retainer designs and rated their experience. The goal was to see if one design caused less tooth sensitivity or gum irritation while still whitening teeth effectively.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

40 people

The number who actually took part.

Started

Apr 2025

Finished

Jul 2025

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 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Completed of orthodontic treatment with Invisalign aligners (Align Technology Inc., CA, USA); willingness to undergo tooth bleaching as a complementary procedure; and current use of clear retainers. Additional criteria included age of ≥18 years of age, good general and oral health, and provision of informed consent. Eligible participants also needed anterior teeth free from carious and periodontal disease, with canines of shade A2 or darker on the VITA Classical scale (VITA Zahnfabrik, Bad Säckingen, Germany) and a Whiteness Index for Dentistry (WID) value ≤15. Exclusion Criteria: * History of previous bleaching; self-reported tooth sensitivity; continuous use of analgesics or anti-inflammatory drugs; pregnancy or breastfeeding; and deleterious habits such as bruxism or smoking. Participants with anterior teeth presenting fixed orthodontic appliances, attachments, restorations, endodontic treatment, color changes due to tetracyclines or fluorosis, or visible enamel cracks were also excluded.

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Conditions

The condition(s) this trial relates to.

dentin sensitivity gingivitis Patient Satisfaction

As listed by the trial registrant

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

Bleaching efficacy Gingival irritation Patient satisfaction Tooth sensitivity

Contacts and locations

Locations

  • Universidad Rey Juan Carlos

    Alcorcón, Madrid, 28922, Spain

More trials for these conditions

Other studies related to the condition(s) this trial covers.