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Gummy Smile
A gummy smile shows more of the upper gums than expected when you smile, usually a noticeable band of pink above the teeth. It is an anatomical trait, not a flaw and not a sign of aging: it simply reflects how your lip muscles, lip length, gums, teeth and upper jaw fit together.
A smile built from four moving parts
Every smile is a negotiation between four structures. The small muscles that lift your upper lip decide how high it travels. The lip itself decides how much it covers on the way up. The gums decide how much of each tooth shows beneath them, and the upper jaw decides where the whole gum line sits. A gummy smile appears when one or more of these tips the balance toward more visible gum.
What causes a gummy smile?
A gummy smile rarely has a single cause. It comes from four anatomical players meeting: the muscles that lift the lip, the length and thickness of the lip itself, the way the gums sit over the teeth, and the vertical growth of the upper jaw. Often two or more combine, and identifying which ones lead is the real starting point.
Hyperactive lip muscles
Several small muscles run from the cheekbones and the sides of the nose down to the upper lip, and they contract together every time you smile. In some people these elevator muscles are naturally stronger or more active, pulling the lip higher than average. The teeth and gums are the same as anyone's; the curtain simply rises further.
A short or thin upper lip
The average upper lip covers most of the gum line in a smile. A naturally short lip, measured from the base of the nose to its edge, or a naturally thin one has less tissue to do that covering, so more gum shows even when smile mechanics are typical. With age the upper lip gradually lengthens, which is why gummy smiles often soften over time.
Gum and tooth proportions
Sometimes the gums themselves cover more of each tooth than usual, hiding part of the crown, the visible portion of the tooth. The teeth underneath are usually a normal size; they are simply partly covered, the way a sleeve that sits low makes a hand look smaller. In these cases the smile is gummy even when the lip and muscles behave typically.
Upper jaw structure
In some people the upper jaw, the maxilla, develops slightly longer vertically during growth. That extra height pushes the teeth and the gum line lower in the face, so even a lip of normal length and normal strength cannot cover the gums when it lifts. This is the most structural cause, set during development and unchanged by habits or skincare.
How to Prevent
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Lip Flip
