Why do my teeth look yellow in pictures and on camera?

Light is part of the photograph

Do your teeth look more yellow in one photo and lighter in another? Lighting and the way your phone renders color can explain part of that difference. Two different photographs are not enough to establish a real change in tooth shade.

A pilot study of dental photography observed shade differences depending on the light source used. The lesson for a personal photo diary is simple: changing the lighting adds a variable to the comparison.

Return to a familiar environment

Imagine taking one photo in your living room at night and the next beside a window in the morning. Even with the same phone, part of the setup has changed. For tracking, choose a location and conditions you can reliably return to, rather than whichever light looks best that day.

Prepare an Enamel guided scan in a dark room, lights off, with no lamp or daylight shining onto your face. The screen illuminates the capture. Keep your eyes open, follow the positioning guide and let the scan check the conditions. Do not add a light to make the preview more flattering.

• Avoid drawing a numerical conclusion by mixing ordinary selfies with guided scans.
• If the app asks for another attempt, check your surroundings first.
• A flattering image is not necessarily a more useful tracking image.

Before concluding, check the context

When two images look different, first consider what changed around you. Were the phone, room and framing the same? If you cannot remember, there is no need to force an explanation. Return to your usual setup at the next check-in and build a clearer record from there.

That is why Enamel only compares scans taken in compatible conditions; otherwise the app says so instead of showing a change. The useful habit is the same with or without an app: keep the setup stable and read a series rather than a single image.