Smile arc: the curve of the upper teeth
Quick facts
- Definition
- The relationship between the curve of the upper teeth's edge and the curve of the lower lip when smiling.
- Cited pattern
- Consonant, when the two curves are parallel.
- Variations
- Flat or reverse, when the curves no longer follow each other.
- Depends on
- Teeth, lips, muscles and skeleton.
- In facial harmonization
- Guides the assessment of lips and mouth corners, together with the dentist.
The smile arc is the relationship between the curve formed by the edge of the upper teeth and the curve of the lower lip when a person smiles. When the two curves run parallel, the arc is called consonant, and it is usually associated with a harmonious smile. When they are straight or inverted, the arc is described as flat or reverse.
What are its components?
| Element | Role in the smile |
|---|---|
| Upper teeth | Define the curve of the incisal edge |
| Lower lip | Provides the comparison curve |
| Smile line | How much tooth and gum shows |
| Incisor display | Amount of tooth visible at rest |
Teeth, gums, lips and muscles work together. A change in one of them alters how the whole is read, and the assessment usually involves the dentist.
Why does it matter in facial harmonization?
The volume and contour of the lips, the length of the upper lip and the position of the mouth corners change how the smile is perceived. That is why it is best to assess the patient at rest and smiling, following the photo at rest and smiling, before proposing any volume.
What precautions apply?
The lip is a vascular risk area, because of the labial arteries, and hyaluronidase should be available whenever hyaluronic acid is used. The decision to treat belongs to the licensed professional, in line with the rules of their professional council. Changing the arc with filler is not promised: results vary from person to person.
Also called: smile curve, smile arc.
Frequently asked questions
Can the smile arc change with lip filler?
The shape and volume of the lips influence the impression of the smile, but the arc also depends on the teeth and gums. Dental changes are for the dentist.