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Reviewed July 5, 2026
What is oral commissure tilt?
Oral commissure tilt, the everyday downturned mouth people worry about, describes whether the corners of your mouth sit slightly up, level, or pulled down when your face is at rest. It is measured by comparing the mouth corners against the centre of the lips, and it quietly sets whether a neutral face reads as content or faintly sad.
How It's Measured
How is oral commissure tilt measured?
Oral commissure tilt compares the height of each mouth corner, the cheilion (Ch), against the stomion (Sto), the point where the lips meet at the midline (Naini, 2011). When the corners sit above that line the mouth reads as upturned; when they drop below it you get the downturned mouth look.
- Cheilion (Ch): the outer corner of the mouth on each side, the point that lifts in a smile and drops in a frown.
- Stomion (Sto): the midline lip contact point that acts as the level reference for the two corners.
- Up, level or down: corners above the reference read as a slight smile, level as neutral, and below it as a resting downturn.
The gap between the corners and that midline is the resting tone of the mouth, and it is one of the first things a face says before anyone speaks.
The same face with the corners pulled down on the right. Oral commissure tilt drops from +1.5 mm (corners slightly up) to -6.6 mm (a clear downturn), which is the difference between a neutral and a faintly sad resting face. Same identity, same lighting, same framing.
Why It Matters
Why does oral commissure tilt matter?
The mouth carries most of the emotion on a face, so where the corners rest changes how approachable you look before you have done anything. A level or faintly upturned mouth reads as calm. A downturned one can make a relaxed face look unhappy or stern, which is why people search for the resting sad face they cannot quite place (Bashour, 2006).
Most resting downturns are not about bone. The corners are held up by small muscles and the surrounding soft tissue, and over time the depressor anguli oris keeps pulling the corners down while volume around the mouth thins, so the commissures drift lower and the marionette folds beside them deepen (Carruthers & Carruthers, 2008). A youthful mouth tends to sit level or slightly up; an ageing one drops at the corners (Penna et al., 2015).
There is no single correct tilt. Some people are simply born with corners that sit a little low, and a faint downturn can read as serious rather than sad, so good analysis looks at the whole lower face rather than chasing one number (Swennen, 2006). The cards and table below give working ranges, but read them against your own resting expression and age.
-1 to +3 mm
Men
0 to +4 mm
Women
0 to +3 mm
Typical Range
Approximate resting corner-to-midline height. Oral commissure tilt is judged on a neutral face and varies with individual structure and age.
Demographic Variants
Oral Commissure Tilt by Group
Oral commissure tilt shifts more with age than with ethnicity, so the table below tracks the resting downturn across the lifespan rather than across populations. Each row links to the source.
Group | Resting corner tendency | Source |
|---|---|---|
Young adults | Corners rest level or slightly up | |
Middle age | Corners begin to drift down as perioral volume thins | |
Older adults | Resting downturn with deeper marionette folds | |
Resting downturn (any age) | Some faces sit low at the corners by anatomy, not mood |
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Your Questions
Frequently Asked Questions
A downturned mouth, or low oral commissure tilt, usually comes from the small muscles around the mouth rather than from bone. The depressor anguli oris pulls the corners down, and as perioral volume thins with age the corners drift lower and the marionette folds beside them deepen (Carruthers & Carruthers, 2008). Some people are simply born with corners that rest a little low.
Yes. A resting downturn at the corners is a normal variation, and a face can sit slightly low at the commissures without any sadness behind it (Naini, 2011). It tends to become a little more pronounced with age as the lower face settles (Penna et al., 2015).
Often, yes. Relaxing the depressor anguli oris with botulinum toxin lets the muscles that lift the corners win out, which raises a downturned mouth at rest, and fillers can rebuild the lost volume around the corners (Carruthers & Carruthers, 2008). The right approach depends on whether the downturn is muscular, volume loss, or both.
Relax your face fully and look straight on, then compare each mouth corner to the centre of your lips. Corners that sit below that midline give you the downturned mouth look, which is what oral commissure tilt measures (Naini, 2011). A neutral photo reads more honestly than a mirror, where you tend to subtly hold the corners up.