Free tool · runs in your browser
Smile Analysis
Upload a photo of your smile and see how even it is: a smile symmetry score, how far each mouth corner lifts above the lip line, which side rises higher, and how wide the smile is against your face. Lines are drawn on your photo.
Drop a photo, paste one, or choose a file
Straight-on, whole face visible, even light. JPG, PNG or WebP.
Runs in your browser. Your photo never leaves your device.
How it is measured
Corner heights, corner lift, width.
The tool finds the mouth corners and the centre of the lips among 478 landmarks and removes head tilt. Smile symmetry compares the height of the two corners as a share of face width; corner lift is how far the corners rise above the line between the lips, as a share of mouth width; width is mouth width against cheekbone width. If the corners barely lift, the photo is read as a neutral mouth and you are asked to smile and retake.
- Symmetry 90+
- Even: corners within a small fraction of face width of each other.
- 75–89
- Slightly uneven: common, and usually unnoticed in person.
- Under 75
- One corner clearly higher.
Sources
What this is based on.
The measurement and its reference ranges come from published research. Studies use different methods and populations, so compare your number with the range shown on this page rather than with other tools.
- 1.
Kokich VO Jr, Kiyak HA, Shapiro PA (1999). Comparing the perception of dentists and lay people to altered dental esthetics. Journal of Esthetic Dentistry. PubMed 10825866
How much change in a smile dentists and lay people notice when teeth and gums are altered in photos.
- 2.
Wang TT, Wessels L, Hussain G, Merten S (2017). Discriminative thresholds in facial asymmetry: a review of the literature. Aesthetic Surgery Journal. PubMed 28200081
How large a left–right difference in a face people can actually see.
Our own data: how much each reading moves when the same face is photographed again is published on the methodology page. How we choose sources.
Related tools
FAQ
Why is my smile crooked?+
Most smiles are slightly uneven: one side's muscles are often a little stronger, and habits like chewing on one side or sleeping on one side are commonly blamed. A difference that appears suddenly, with drooping, is a reason to see a doctor.
Can I make my smile more even?+
Practising in a mirror and relaxing the stronger side can make a posed smile more even. Muscle asymmetry from nerve problems or dental causes needs a professional.
Does it check my teeth?+
Not in this version. It reads the mouth outline only, and notes whether the mouth is open.
Which photo works best?+
A straight-on photo at eye level with your natural smile. A turned head makes one corner look higher.
Is my photo uploaded?+
No. Everything runs in your browser.
One reading here.
Nineteen in the app.
A controlled scan, every reading against its ideal band, bone vs trainable, a plan, and a 3D model on Face ID iPhones.