Gummy Smile: Your Teeth Are Already Beautiful, the Gum Is Hiding Them

You’re sixteen. You’re beautiful. But you look at a photo and see more gum than teeth. A friend points it out, or maybe nobody says anything and the thought just arrives on its own. You start smiling with your mouth closed. Then a dentist tells you that a few veneers will “fix everything.”

Stop for a second. Breathe.

There’s an excellent chance your teeth are already perfect. Not short, not small, not malformed. Just covered. The gum is hiding them the way a cloth covers a finished statue, waiting for the unveiling. The problem isn’t the statue. It’s the cloth.

How a tooth really comes in

When a tooth “erupts” it doesn’t do it in one move. It does it in two distinct phases.

The first is active eruption: the tooth rises vertically until it meets its antagonist and finds its place in the bite against the opposing teeth. This is the movement everyone notices.

The second one nobody notices, because it’s slow and silent. It’s passive eruption: the gum margin gradually slides toward the root, uncovering the enamel little by little until it stops at the neck of the tooth, the point where enamel ends and the root begins. Coslet and colleagues described this process back in 1977, and their classification is still used today.

When passive eruption is complete, you see the whole tooth. When it stops halfway, you see a lot of tooth covered by gum. But the tooth, underneath, is whole.

The eruption that didn’t finish

Once the situation settles, over the years, sometimes the gum doesn’t migrate as far as it should, and a generous portion of perfectly healthy enamel stays buried under the tissue. It’s called altered passive eruption, or APE. And sometimes it’s not just the gum: the bone too stays too high, close to the neck.

The visual result is the one that worries you: teeth that look stubby, square, too short, with a lot of gum in the smile. The review by Mele and Zucchelli in Periodontology 2000 (2018) puts it clearly: the goal of treatment isn’t to “add” tooth, but to re-establish the correct relationship between gum margin, bone crest, and neck. In other words, to put the cloth back where it belongs.

And this concept is critical to grasp, especially at your age. Passive eruption is a process that can continue for years. It can carry on through adolescence and into the first years of adulthood. Kokich, in a paper in the Journal of Oral and Maxillofacial Surgery (2004), describes exactly how in adolescents the level of the gum margin can still change, even after orthodontic treatment.

Translation: what feels like “too much gum” at fourteen might sort itself out by eighteen or twenty. Operating earlier means risking the correction of something that biology would have fixed naturally, on its own.

The temptation of veneers

Here comes the part that really matters.

Veneers are thin shells of ceramic (or sometimes other materials) bonded to the front face of the tooth to change its shape or color. They work beautifully when the tooth really is small, chipped, stained, malformed. They build something that’s missing.

But if your tooth is already white and the right shape and simply covered by gum, the veneer fixes nothing. You’re repainting a picture that’s only hidden under a cloth. At best you spend money for a result you could have gotten by exposing the tooth that’s already there. At worst, the dentist grinds down healthy enamel to make room for the ceramic — and that enamel never comes back. You’ve turned a natural, intact tooth into one that from now on will need prosthetic maintenance for the rest of your life.

I’m biased, I admit it. But I’m biased armed with a simple idea: you don’t destroy healthy tissue to solve a problem that’s about coverage, not substance.

There’s also a piece of data that puts the urgency in perspective. Lukež and Špalj, in the Journal of Oral Rehabilitation (2014), measured in 155 people aged 12 to 39 how much the various details of a smile weigh on psychological well-being. The factor that truly counts is tooth malposition, not the amount of gum on display. Gum in the smile, on its own, matters far less than we fear. People notice crooked teeth, not millimeters of gum.

That said, if a gummy smile is a real problem for you, you solve it the right way. Mucogingival surgery solves it, for good.

The diagnosis that decides everything

Before touching anything you need to understand why you see too much gum. Same appearance, different causes, opposite treatments.

Coslet’s classification distinguishes two elements. The first: how much keratinized gum you have — that thick, tough, pale-pink tissue with an orange-peel surface, built to withstand the toothbrush and chewing. The second, more important one: where the bone crest sits relative to the neck of the tooth.

If the bone is already in the right position, a couple of millimeters from the neck, then removing the excess gum is enough. A gingivectomy, a simple procedure.

If instead the bone has risen too far, almost up to the neck, removing only the gum isn’t enough: it would grow back. The body defends a minimum biologic space between the bone and the floor of the gingival sulcus — Gargiulo measured it decades ago, and it’s a figure every periodontist respects (ref.). If you don’t recreate that space by recontouring the bone, the gum returns to exactly where you took it from.

And how do you tell the two cases apart? Not by eye. You need a low-dose volumetric scan, the CBCT, which shows precisely where the bone crest sits relative to the neck of each tooth. Pedrinaci and Sanz’s group, in the Journal of Esthetic and Restorative Dentistry (2023), showed how combining CBCT, intraoral scanning, and digital photography lets you plan the procedure to the millimeter and show you the result before starting. A Vietnamese group took the idea as far as a surgical guide resting on the bone to cut it exactly where needed (2024).

Skipping the CBCT and improvising means finding out only in the operating room that the bone was too high, and having to decide on the spot. The keratinized gum has to be assessed at the same time: if you have little of it, cutting it away with a gingivectomy would leave you without that tough barrier protecting the tooth. In that case you move the tissue instead of removing it.

The procedure, when it’s truly needed

If the diagnosis confirms altered passive eruption and eruption is now complete, the treatment is called esthetic crown lengthening. Nothing actually gets “lengthened”: you expose the crown that was already there.

The surgeon removes the excess gum and, if the CBCT calls for it, gently recontours the bone to recreate the correct biologic space. It’s a planned procedure, not aggressive, tailored to your anatomy.

And the results hold. Aroni and colleagues followed six women aged 18 to 22 operated on for altered passive eruption with bone recontouring (2019): at one year the gum margin was stable, with an average gain in visible crown of 1.6 mm that stayed unchanged. The most recent review by Tatakis (2023) confirms crown lengthening as the established treatment for this form of gummy smile. Once the right relationship between bone, gum, and tooth is restored, the correction is permanent.

No ceramic. No ground-down enamel. Just the tooth you already had, finally uncovered.

And what about deep bite?

You’ve also heard about deep bite, and you’re right to wonder whether it’s involved.

A deep bite is a situation where the upper incisors overlap the lower ones too much. It often goes together with over-eruption of the upper incisors: the front teeth drop too far, dragging bone and gum down with them. The result can look like a gummy smile, but the mechanism is different.

Here the gum hasn’t “lagged behind”: it’s the tooth that has “dropped too far.” And the correction changes accordingly. Often the answer isn’t gum surgery but orthodontics, intruding the incisors back to the correct position. Sometimes the two coexist and are treated in sequence.

That’s why I insist on diagnosis. The exact same amount of gum in the smile can come from incomplete passive eruption, from a deep bite with over-erupted teeth, from an upper lip that’s too mobile and lifts beyond normal (and here the treatment belongs to an aesthetic physician), or from excess vertical growth of the upper jaw bone. Four causes, four different treatments. Anyone proposing the same solution — veneers — for all four hasn’t made the diagnosis.

When it’s right to wait, or do nothing

Not everything needs correcting. A smile with a few extra millimeters of gum is a normal variant, not a pathology. If it doesn’t bother you, leaving it alone is a legitimate choice.

And if you’re under eighteen, the wisest option is often time. An assessment now to understand the cause, then a review in a few years, once passive eruption has had the chance to complete. Rarely, but it happens, in a very young adolescent the gum rises on its own enough to make any procedure unnecessary.

Is it already a problem for you and you don’t want to wait until you’re eighteen? Talk to your parents and go together to a periodontist to weigh everything calmly.

What shouldn’t be done is acting in a hurry, on intact teeth, driven by the anxiety of a photo.

What to do, concretely

If the amount of gum in your smile weighs on you, ask for a periodontal assessment, not a quote for veneers. The periodontist looks at the keratinized gum, probes the position of the bone, and if needed orders a CBCT to tell the simple-gum case apart from the one that also involves the bone.

From there you know exactly what you’re dealing with. And in the vast majority of cases the answer will be the most reassuring one possible: your teeth are perfectly fine as they are. You just need to lift the cloth.