1. What a gummy smile actually is
The clinical term is excessive gingival display: more gum tissue is visible above the upper teeth when smiling than is typical. There is no universal threshold at which display becomes a problem, and the amount most people consider unremarkable falls within a range rather than at a point. It is a variation in normal anatomy that some people are bothered by, and it is not a disease.
That framing matters because it sets the standard for treatment. Nobody needs treatment for this. Someone who is troubled by it may reasonably choose to treat it, and the decision should be made with an accurate understanding of what causes theirs.
2. The causes, which determine everything else
Muscular. The muscles that raise the upper lip may be more active or stronger than average, lifting the lip further and exposing more gum. This is a common cause and it is the one most amenable to non-surgical treatment.
Dental and gingival. Teeth may be shorter in appearance because gum tissue covers more of them than usual, sometimes because eruption did not complete in the typical way. Here the teeth are effectively hidden rather than the lip being raised too far.
Skeletal. The upper jaw may be positioned or proportioned such that the whole dental arch sits lower relative to the lip. This is a structural characteristic and cannot be addressed by anything acting on the lip or the gum alone.
Lip anatomy. A shorter upper lip, or one with particular movement characteristics, exposes more gum at rest and in movement regardless of muscle activity or jaw position.
These frequently occur in combination, which is why assessment by a clinician who can distinguish them, usually with dental and radiographic examination, comes before any discussion of treatment. A provider who proposes a treatment before establishing the cause is not assessing, they are selling.
3. The muscular route
Where hyperactive lip elevator muscles are the cause, small doses of botulinum toxin placed to reduce the pull of those muscles will lower the resting and smiling position of the upper lip and reduce gingival display. The evidence for this specific indication is reasonable, and the practical characteristics of the treatment are what a patient needs to understand.
The effect is temporary. It develops over days, lasts a matter of months, and requires repetition to maintain. Technique is unusually consequential here compared with other facial applications, because the muscles involved govern the shape of the smile itself. Too much, or placement that is slightly off, produces an upper lip that does not move naturally, an asymmetric smile, or difficulty with certain sounds. These effects resolve as the treatment wears off, which is a genuine reassurance and a poor consolation for several months.
Botulinum toxin is a prescription-only medicine in the UK, which means the same requirements described elsewhere on this site apply: an assessment by an appropriately qualified prescriber, a genuine prescribing relationship, and a clear complication plan.
4. The dental, gingival and surgical routes
Where gum tissue covers more of the tooth than it should, procedures that reshape the gum margin, sometimes with adjustment of the underlying bone level, expose more of the natural tooth. These are established dental procedures with a durable result, performed by dentists and periodontal specialists.
Where tooth position or the relationship between the arches contributes, orthodontic treatment may address it, sometimes with techniques that alter the vertical position of the upper teeth. This is a longer process measured in months to years.
Where the cause is skeletal, orthognathic surgery repositions the upper jaw. This is major surgery under general anaesthetic with a substantial recovery period, planned jointly by orthodontists and maxillofacial surgeons. It is the only approach that addresses a skeletal cause, and it is a serious undertaking that is not entered into for cosmetic reasons alone in most cases.
Lip repositioning procedures, which limit how far the upper lip can rise, are also described. They are less commonly performed and the published evidence base is smaller.
The treatments with the most durable results are dental, orthodontic and surgical. The treatment most heavily marketed to the public is the temporary injectable one, because it is quicker, cheaper per episode, needs no theatre and generates repeat appointments. That is not an argument against it. It is an argument for understanding why you are being offered what you are being offered.
5. Choosing a provider
The single most useful question is whether the provider can assess and explain the cause. A clinician who examines your teeth, gums and lip movement, discusses which of the four causes applies to you, and explains what a given treatment can and cannot do for that cause is doing the job properly. One that proposes injections without any of that has skipped the part that determines whether the treatment can work.
The second question is whether they will decline. Where the cause is skeletal, a temporary injectable will disappoint, and a provider who says so is more useful than one who takes the payment.
Providers in this space span dental practices, maxillofacial services and medical aesthetic clinics, and the right one depends entirely on which cause applies to you. Dr Harry Clinic, a doctor led practice in west London, is one named example of a clinic offering non-surgical assessment for concerns of this kind, and it appears here as a single named example rather than as a recommendation. The disclosure below sets out the basis on which it is named.
6. Cost and what to expect
UK pricing varies substantially by approach. Injectable treatment for this indication commonly ranges from around one hundred and fifty pounds to around three hundred and fifty pounds per session, repeated as the effect wears off. Gum contouring procedures typically range from a few hundred pounds to well over a thousand depending on extent. Orthodontic treatment runs into thousands, and orthognathic surgery is a major procedure priced accordingly, and is sometimes provided through the NHS where there is a functional indication rather than a cosmetic one.
The relevant comparison is not per session but over years. A temporary treatment repeated indefinitely can exceed the cost of a durable one, and that arithmetic is rarely presented at the point of sale.
7. Our position
Establish the cause before discussing the treatment. Understand that the most heavily marketed option is the temporary one and that this reflects commercial structure as much as clinical appropriateness. Expect a provider to tell you when a treatment will not achieve what you want. And keep in view that this is a variation in normal anatomy that requires no treatment at all.
For how we approach claims in this sector generally, see how we grade evidence, and for the questions worth asking any injectable provider, see our practical guide to assessing claims.