Buccal corridor
 Adult dentition (Commons). The buccal corridor is the dark space at the smile corners, not a tooth.
| |
| Field | Dentistry |
|---|---|
| Also known as | negative space, smile corridor, buccal corridor space
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| Related | Teeth; Palate expansion; Midface |
The buccal corridor is the dark space that shows between the buccal surfaces of the posterior maxillary teeth and the inner commissure of the lips in a posed smile.[1] Orthodontics measures it as a ratio of that dark area to smile width. Looksmaxxing treats a wide corridor as a “narrow smile” tell and a filled corridor as a broader, more expensive-looking smile.
It is a photographic and clinical observation, not a diagnosis. Arch width, tooth size, lip stretch, and camera distance all move it. Extraction versus non-extraction is not a corridor switch by itself.[2]
Method
What actually changes the corridor is the dental arch and how far the lips pull, not a facial exercise.
- Orthodontics — arch form, expansion, and finishing. Palate expansion / MARPE is the looksmaxxing name for widening a narrow maxilla; that is an orthodontist’s call on CBCT, not a forum vote.
- Restorative — veneers and crowns can fake width; they do not grow bone.
- Photo — a wide grin and a close lens shrink the dark corners. That is a pose, not a maxilla.
Moore and colleagues digitally varied smile fullness from 2% to 28% buccal corridor; lay raters preferred the broader smiles (minimal corridors) and put large corridors on the problem list.[1] Yang and colleagues found vertical face height, incisor show, and tooth material correlated with corridor area; extraction versus non-extraction did not.[2] Reduction of corridors is not a reason to expand an otherwise normal maxilla.[1]
This wiki's view
A black corner on a smile photo is a dental-arch and lip problem. Treat it as dentistry. Do not treat a rating-app “corridor %” as a diagnosis, and do not expand a normal palate to chase a mill calculator.