In short
- 🚨 A lip lift does NOT correct a gummy smile: it increases it. It is a relative contraindication and the one least often published.
- A gummy smile is usually defined as more than 3 millimetres of gum visible when smiling.
- It is not rare. In a cross-sectional study of 299 people aged 10 to 50, 44% had one, mostly women aged 20 to 30. ⚠️ It is one particular population and cannot be extrapolated, but it gives an idea of how common it is.
- 🔑 And there is one finding that connects it directly with this surgery: among the statistically significant associated factors are lip hypermobility (p = 0.029) and the length of the subnasal-philtrum segment (p = 0.048) — the very measurement a lip lift operates on.
- The two measurements that get confused are different: the tooth visible at rest — what a lip lift improves, going from 1.5-2.0 mm to 3.5-5.0 mm in the studies — and the gum visible when smiling, which is what can get worse.
- A gummy smile has four possible causes and none of them is treated with a lip lift.
- ✅ If the diagnosis points to a dental origin, you are referred to a dentist. And faced with a gummy smile, the lip lift is advised against — although it can be done if the limitations are properly understood.
There is a confusion here that can prove expensive, and it is worth clearing up before anything else:
A lip lift makes more tooth show. And more gum too. That is exactly what you want if your problem is that nothing shows at all — and exactly what you do not want if your problem is that too much gum already shows when you smile.
It is the same operation, the same effect and two opposite conclusions depending on where you start from.
The two measurements that get confused
Almost all the misunderstanding comes from mixing up two things that are measured at different moments.
At rest, with the mouth relaxed. Here what is looked at is how much upper incisor shows. A young lip lets a few millimetres show; a lengthened lip lets none show. That is what a lip lift corrects: in the systematic review of 1,754 patients, that show went from 1.5-2.0 mm to 3.5-5.0 mm.
Smiling. Here what is looked at is how much gum is on show above the teeth. More than 3 millimetres is what is usually considered a gummy smile.
🔑 A lip lift raises the lip in both situations. It raises the lip at rest — which is what you want — and it also raises the lip when you smile — which nobody who already shows gum wants. It is not a side effect: it is the same effect seen at another moment.
What a gummy smile is and why it happens
It is defined as more than 3 mm of gingival show when smiling, and it is multifactorial. In a cross-sectional study of 299 people aged between 10 and 50, 44% had one, predominantly women aged 20 to 30, and the factors significantly associated with it were:
- The interlabial distance (p = 0.001).
- The upper incisor show (p = 0.001).
- Lip hypermobility (p = 0.029).
- The subnasal-philtrum length (p = 0.048).
- The ratio between the lower and middle facial thirds (p = 0.001).
⚠️ With the obligatory caution: it is a study in a single population, and its own authors ask for larger, multicentre samples to confirm it. It is useful for knowing that this is not a rare phenomenon and for identifying what is associated with what, not for extrapolating the 44% elsewhere.
🔑 What matters for this page is the appearance of two particular factors: lip hypermobility and philtrum length. That is, the very measurement a lip lift acts on is statistically related to gummy smile. It does not mean the lip lift causes it; it means that anyone operating on that area has to assess this before touching it.
The four causes, and none of them is the lip lift
A gummy smile can come from very different places, and the treatment depends on which:
1. Vertical maxillary excess. The bone is longer than usual and drags everything downwards. It is a skeletal problem.
2. Upper lip hypermobility. The lip rises more than normal when smiling because the muscle pulls hard. The lip itself is fine; what moves too much is the dynamic.
3. Altered passive eruption. The teeth are partly covered by gum and look short, so the tooth-to-gum proportion is inverted. It is a dental matter, and the dental literature addresses it with aesthetic crown lengthening.
4. A short upper lip. The lip is shorter than it should be and uncovers more as it rises.
🚨 Note number 4: someone with a short upper lip is exactly the opposite of a candidate for a lip lift. Shortening it further in that case is making the cause worse.
⚠️ And something worth saying clearly: telling which of the four is yours cannot be done from a photograph or over the internet. It requires examination, and in some cases imaging. This page does not diagnose.
How much tooth “should” show
The honest answer is that there is no correct figure, and anyone who gives one is simplifying.
What there are are descriptive references: incisor show at rest tends to decrease with age — it is part of the ageing of the lip — and to increase after a lip lift, according to the ranges in the systematic review. But the “normal” range varies with age, sex, the height of the lip, the length of the teeth and the facial pattern.
🔑 The useful question is not “how much should show” but “how much used to show on me”. Comparing with your own photographs from fifteen or twenty years ago is more informative than any table — and it is the comparison used in the consulting room.
And a note on the dental reference: what lies underneath determines what you see. An anatomical analysis of 226 imaging studies found a positive association between the upper anterior teeth and the contour of the upper lip. That is why a proportion of these consultations turn out to be dental or orthodontic rather than surgical.
So can I have surgery if I show gum?
It is not an automatic no, and it should not be read that way.
What is true:
- If your main complaint is “too much gum shows when I smile”, a lip lift goes in the opposite direction.
- If your main complaint is “no tooth shows at all at rest” and you also show some gum when smiling, it is a risk-benefit assessment to be made with the face in front of you — not an absolute contraindication.
- The amount that can be lifted in that profile is smaller, and the asymmetry of risk that governs this whole operation weighs even more: falling short can be adjusted; overshooting cannot. It is covered in who is a candidate and who is not.
✅ How much smaller, exactly? There is no number, and anyone who gives you one is making it up. The centre’s criterion is that it depends on the case and on each person’s proportions — the same as governs the indication for this surgery in general. In someone with visible gum, the margin comes from looking at your face, not from a table.
And what this page can tell you, because it is confirmed: when the diagnosis points to a dental origin — altered passive eruption, for example — you are referred to a dentist. A surgical solution on the lip is not forced onto a problem that lies in the teeth.
And on the lip lift specifically, the position is explicit: faced with a gummy smile, it is advised against.
⚠️ Advising against is not forbidding. It can be done if the limitations are understood and accepted: more gum will show, the margin for lifting is smaller, and part of what is gained in tooth is paid for in gum. What is not done is to present this surgery as the solution to a gummy smile, because it goes in the opposite direction.
So what is done here about a gummy smile?
✅ It is treated, but not with this surgery: with botulinum toxin, with hyaluronic acid, or with both, depending on the case and the medical assessment.
🔑 And that sentence, read slowly, says something important: the treatment of gummy smile at this centre is not surgical. It is exactly the opposite of what you would expect from a page about an operation — and it is the reason the lip lift is advised against in this profile here rather than sold as the solution.
⚠️ What is right in your case depends on the diagnosis, which governs everything else: lip hypermobility is not the same as vertical maxillary excess or a problem of dental eruption. That is why neither regimen nor product is published here: what is published is that the route exists and that it is decided by seeing you.
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Frequently asked questions
Can a lip lift correct my gummy smile?
No. It increases it. If someone offers you a lip lift to reduce the visible gum, it is worth asking them to explain the mechanism by which that would happen.
I show a little gum — does that rule me out?
Not automatically. It depends on how much, on why and on what your main complaint is. It is one of the assessments where it matters most that whoever examines you sees how you smile, not how you pose.
Are there treatments for a gummy smile?
There are, and they depend on the cause: the described approaches range from aesthetic crown lengthening in dental cases to solutions addressing the dynamic of the lip or the bone in skeletal ones. Which one is right for your case is a clinical decision and not one for a web page, and this one recommends none of them.
How do I know whether my lip is short or long?
At rest: if tooth shows and the nose-to-lip stretch looks short to you, it is short; if nothing shows and that stretch looks long, it is long. It is the first question in why the upper lip lengthens with age.
I have been told toxin fixes it — is that true?
In part, yes, and it is done here. ✅ A gummy smile is treated with botulinum toxin, with hyaluronic acid or with both, depending on the case and the medical assessment.
⚠️ What is not true is that it “fixes” it every time. It acts on lip hypermobility, which is one of the four causes: if yours is vertical maxillary excess or a problem of dental eruption, it does not reach that. That is why the honest answer starts with the diagnosis and not with the treatment. It is set out in full in botulinum toxin or hyaluronic acid and in lip flip, threads and “permanent augmentation”.
Sources
- Ghafary ES, Karimi S, Hamrah MH, Khalid GS, Shadab H, Nawabi A, Alipour F, Ahmadi ME, Hamrah AT. Prevalence and Contributing Factors of Gummy Smile: A Cross-Sectional Study in Kabul, Afghanistan. BioMed Research International, 2026. PMID 42338152. — Cross-sectional study of 299 participants aged 10 to 50; it defines gummy smile as more than 3 mm of gingival show when smiling and describes it as multifactorial, with skeletal, muscular and dentogingival causes; prevalence of 44%, predominantly in women aged 20 to 30; significant differences in interlabial distance (p = 0.001), upper incisor show (p = 0.001), subnasal-philtrum length (p = 0.048), lip hypermobility (p = 0.029) and lower-to-middle facial third ratio (p = 0.001); the authors call for larger, multicentre samples to confirm the findings.
- Komisarek O, Banasiak Ł, Olichwer V, Burduk P. The Bullhorn and Beyond: Evidence-Based Review and Clinical Recommendations for Lip Lift Techniques. Journal of Cosmetic Dermatology, 2026. PMID 41731334. — PRISMA 2020 systematic review of 7 studies and 1,754 patients; reduced upper incisor show is among the age-related changes of the lip, and lip lift techniques increased it from 1.5-2.0 mm to 3.5-5.0 mm.
- Moslehitabar Z, Najafii R, Shiezadeh F, Shooshtari Z, Khojaste M. Tooth show enhancement in the esthetic zone: a review and proposal a decision-making framework. The Saudi Dental Journal, 2025. PMID 41231294. — A review of the indications for aesthetic crown lengthening and a proposed decision-making framework; it notes that most published guidance focuses on cases with excessive gingival show and that patients without gingival show who might benefit are frequently overlooked; it stresses the importance of coordinated, early consultation before surgical execution.
- Rusu LC, Beschiu LM, Iacob F, Zaharia C, Neuwirth K, Bulut O, Ardelean LC. A morphometric anthropometric analysis of the upper lip in adult Western Romanian population — a retrospective study. Scientific Reports, 2025. PMID 40425617. — 226 imaging studies; a positive association between the skeletal and soft-tissue contour of the maxilla, specifically between the upper anterior teeth and the upper lip.
Book your consultation
Of all the assessments in this line, this is the one that can least be done at a distance: the smile has to be seen. If the gum you show worries you — or if you have been offered a lip lift and you show some — it is exactly the conversation that should take up the pre-operative consultation, before any talk of dates.
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Last reviewed: 19 September 2026. This content is for information only and does not replace an individual assessment by a healthcare professional.
