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Before you compare, check your photos.

A difference between two photos of teeth can come from how they were taken. This checklist helps you spot different or unknown conditions before interpreting teeth whitening before-and-after photos.

Use the checklistUnderstand the limits

How do you check teeth whitening before-and-after photos?

Start by checking the device, light, framing, original images and context of both photos. Record any condition that differs or remains unknown. Keep this checklist to prepare your next photos.

No photo upload. Your answers stay on this page and are not saved or transmitted by this tool. Reload the page or choose “Start again” to clear them.

5 things to check

Think of the two photos you want to compare. For each item, choose “Yes” only if you could check the conditions. When in doubt, “I’m not sure” keeps that uncertainty visible.

Same phone, same camera and same settings?

Switching between front and rear cameras, phones or photo modes can change the image. Automatic settings may also vary, even on the same device.

Device · Change for your next photos

For future photos, keep the same device, camera and mode. Record what you can check without assuming exposure and white balance are identical.

Same light source, in the same place?

The colour and direction of light, as well as shadows, affect how teeth look. A window does not always provide the same light at the same time; mixing window light and an overhead light adds another variable.

Light · Change for your next photos

Use one source and the same position relative to it. Record the source, location and time. If the light in the two photos differs or is unknown, keep that limitation with your comparison.

Same distance, angle and visible teeth?

A closer view, a tilt or a different smile can change reflections and visible areas. Compare equivalent areas rather than the overall brightness of the face.

Framing · Change for your next photos

Keep a reference for the distance and height of the phone. Reproduce the angle and framing without digital zoom, showing the same teeth in a sharp image.

Two originals without filters or edits?

Beauty mode, filters, colour correction or a screenshot can change an image. No manual editing does not mean the phone has applied no automatic processing.

Original images · Change for your next photos

Start with original files and turn off filters or beauty effects for future photos. Do not try to make an old photo comparable by brightening teeth or correcting its colour.

Dates and conditions recorded for both photos?

A picture alone does not tell you when or how it was taken. Recording context helps you reproduce the conditions and separate observations from unknowns.

Context · Change for your next photos

Keep the dates and record the point in your routine, device and light for each photo. Explicitly note any missing information. Do not infer a product’s effect from the photos alone.

View my checklist

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Before-and-after photos · Conditions checklist

Before photo (date): __________________ After photo (date): __________________

  1. Same phone, same camera and same settings?

    Not answered

    For future photos, keep the same device, camera and mode. Record what you can check without assuming exposure and white balance are identical.

  2. Same light source, in the same place?

    Not answered

    Use one source and the same position relative to it. Record the source, location and time. If the light in the two photos differs or is unknown, keep that limitation with your comparison.

  3. Same distance, angle and visible teeth?

    Not answered

    Keep a reference for the distance and height of the phone. Reproduce the angle and framing without digital zoom, showing the same teeth in a sharp image.

  4. Two originals without filters or edits?

    Not answered

    Start with original files and turn off filters or beauty effects for future photos. Do not try to make an old photo comparable by brightening teeth or correcting its colour.

  5. Dates and conditions recorded for both photos?

    Not answered

    Keep the dates and record the point in your routine, device and light for each photo. Explicitly note any missing information. Do not infer a product’s effect from the photos alone.

This summary relies only on your answers. It does not analyse images, validate comparability or measure tooth shade or whitening effectiveness.

Notes and conditions to reproduce:

What is this checklist for?

It turns five photography questions into notes you can keep with your images. Use it before taking a new pair of photos, or when reviewing an existing pair so you do not overlook missing conditions. The five items are not weighted: there is no quality score or pass mark.

Reading your checklist

A “No” answer

A condition you report as different appears in the actions for your next photos. The advice cannot undo the difference in older images.

An “I’m not sure” answer

That condition stays an uncertainty to record. Missing information does not become an identical condition.

Five “Yes” answers

You have reviewed all five items. Keep the checklist with your images, dates and notes so you can return to those conditions for your next photo.

What a photo cannot tell you

Even with similar conditions, a phone photo is not a calibrated measurement of tooth colour. This checklist cannot establish a dental shade, a product’s effectiveness or the cause of a visible difference. It does not assess your dental health or provide treatment advice.

If your older photos were taken differently

Keep them as a visual record with their limitations. For the next photo, record the conditions you can reproduce. Editing images to “match” does not recreate their original conditions. Keep uncertainty explicit instead of presenting a difference as a measured result.

Understand your photo conditions

Before-and-after photos: the guide

Original files, framing and repeating the conditions, with the guide’s sources.

Why light changes perceived tooth shade

Separate a change in lighting from an observation about tooth colour.

An Enamel team tool. Our guides detail the principles and their sources; this tool has not been clinically validated. Our editorial approach