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Which tooth whitening method causes less pain? new study compares

NCT ID NCT07669324

Symptom relief Sponsor: Nahda University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested two ways to whiten teeth: a chemical bleaching gel and a light-activated bleaching gel. Thirty adults with yellowish or brownish stains on their front teeth were randomly assigned to one of the two methods. Researchers measured how white teeth got, how much tooth sensitivity people felt, and how satisfied they were with the results over one to three months.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
tooth bleaching gel (chemical or light-activated)
What this could lead to
If successful, this could help dentists choose a bleaching method that whitens teeth effectively while causing less tooth sensitivity.
What could go wrong
This is a small, completed study with only 30 participants, so results may not apply to everyone. Tooth sensitivity is a known side effect of bleaching.

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

30 people

The number who actually took part.

Started

Feb 2025

Finished

May 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 to 45 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Presence of six sound maxillary anterior teeth. * Patient having brown or yellowish stains. * Good oral health maintained by routine brushing. * Generalized tooth staining ranging from A2 or darker according to the value-oriented shade guide (Vita easy shade). * Patient is willing to sign a consent form and can attend all recall visits. Exclusion Criteria: * Existing anterior crowns or any restorations on anterior teeth that will interfere with the bleaching process. * Smoker or alcoholic patient. * Patients suffering from active periodontal diseases and exposed roots. * Patient who undergone previous whitening procedure. * Pregnant and lactating women.

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Conditions

The condition(s) this trial relates to.

dentin sensitivity

As listed by the trial registrant

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

Dentin hypersensitivity

Contacts and locations

Locations

  • Nahda University

    Banī Suwayf, Beni Suweif Governorate, 62511, Egypt

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