Cupid's Bow
The cupid's bow is the M-shaped curve at the top of the upper lip — its definition and width are key markers of lip aesthetics.
Definition
The cupid's bow is the double curve in the middle of the vermillion border of the upper lip, named for its resemblance to the bow held by the Roman god of love. It consists of two peaks (the philtral peaks) flanking a small central dip (the philtral dimple). The shape is defined by the underlying philtral columns and is one of the most recognizable lip features. Cupid's bow types vary widely — some lips show a sharp, well-defined bow with crisp peaks; others have a soft, rounded curve with little visible peak; still others show a flat or "no-bow" upper lip. The shape is largely genetic but can be enhanced or restored with lip filler, lip flip (botox), or surgical lip lift.
Why it matters
A defined cupid's bow is consistently rated as one of the most attractive lip features, particularly in women. It signals youth (the bow flattens with age as the upper lip ages) and good lip volume distribution. In aesthetic medicine, restoring or enhancing the cupid's bow is a primary goal of lip filler — over-filling without preserving the bow produces the recognizable "duck lip" effect that reads as artificial.
How AI measures it
AI traces the upper-lip vermillion border and identifies the two philtral peaks and the central dip. The system measures peak height, peak-to-peak distance, and dip depth. A "cupid's bow score" combines definition (height/depth) and symmetry between left and right peaks.
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Frequently asked questions
Is a sharp cupid's bow more attractive?
In most studies, yes — defined cupid's bows are rated higher than flat or soft ones, especially in women. Cultural preferences vary.
Can you create a cupid's bow without filler?
Makeup (lip liner overdrawn slightly above the natural border at the peaks) is the most common non-permanent method. Lip flip botox can elevate the upper lip and slightly enhance the bow.
Why does my cupid's bow flatten with age?
The upper lip thins and the vermillion border softens with age due to collagen loss. The philtral columns become less defined, which flattens the bow.