Smile Botox (Gummy Smile & Lip Flip)

A smile is one of the worst places in the face to plan treatment from a still photograph.

The upper lip changes height. The corners move laterally and vertically. The orbicularis oris changes the shape of the mouth. The teeth and gums become more or less visible. Several small muscles contribute simultaneously, and the movement on one side is rarely an exact copy of the other.

This is why “smile Botox” is not really one procedure.

A patient with excessive gum show, a patient whose upper lip rolls inward during smiling and a patient whose mouth corners are pulled downward may all be offered botulinum toxin around the mouth. But the target muscle and the treatment objective are different in each situation.

More importantly, not every gummy smile is a muscle problem and not every thin-looking smiling lip needs a lip flip.

So I begin with movement rather than units: what is the smile doing, which structure is creating the feature the patient dislikes, and what normal function could change if I weaken that structure?

Smile Botox is a movement treatment

Botulinum toxin temporarily reduces neuromuscular signalling in the muscle into which it is placed.

Around the mouth, that mechanism has to be used with particular restraint because the muscles are doing far more than creating wrinkles.

They move food and drink. They help articulate speech. They close and shape the lips. They create expressions that other people interpret almost instantly.

This is why I do not use complete relaxation as an endpoint in the perioral region.

The purpose is to reduce one excessive component of movement while preserving the rest of the smile.

A technically smoother or more symmetrical mouth is not a successful result if the patient has lost the movement they need to speak, drink or smile naturally.

A gummy smile is a description, not a diagnosis

Some gum show during smiling is normal.

How much is considered aesthetically excessive depends partly on anatomy and partly on personal preference. I therefore do not think one millimetre threshold should automatically turn a smile into a treatment indication.

When a patient is genuinely bothered by prominent gingival display, I want to know why it occurs.

One mechanism is excessive elevation of the upper lip during smiling. In that situation, the muscles responsible for lip elevation may be appropriate botulinum toxin targets.

But gingival display can also be influenced by the vertical relationship of the maxilla, tooth proportions, gingival anatomy, upper-lip length and other dentofacial factors.

If the main problem is skeletal or dental, reducing muscle activity may provide only partial camouflage or may simply be the wrong treatment.

Botox works best for a gummy smile when movement is genuinely the dominant mechanism

The clearest injectable indication is a patient whose resting anatomy is relatively appropriate but whose upper lip elevates disproportionately during smiling.

In that situation, a small reduction in elevator activity can reduce the amount of gum exposed without needing to change the teeth or add volume to the lip.

The key is proportionate weakening.

If too much elevator activity is reduced, the smile can become less mobile or feel unfamiliar. The upper lip may not rise enough. Asymmetry can become more noticeable if one side responds differently.

This is why I would rather begin conservatively and evaluate the completed biological response than try to create the maximum reduction in gum show at the first session.

The desired endpoint is still a smile, not a neutralised upper lip.

A skeletal gummy smile cannot be injected into becoming a muscular one

This boundary is particularly important when gingival exposure is substantial.

If the vertical skeletal relationship is a major driver, botulinum toxin cannot change the maxilla. Likewise, if gingival tissue or tooth proportions are central to the appearance, those structures remain unchanged after the muscle is weakened.

The patient may still obtain a modest reduction in lip elevation if there is a muscular component, but the treatment should be described as camouflage rather than correction of the underlying structure.

In selected patients, dental, periodontal, orthodontic or maxillofacial assessment may therefore be more appropriate than escalating toxin dose.

I do not increase Botox to compensate for anatomy that Botox cannot change.

Possible and appropriate are not the same thing here either.

A lip flip changes position, not volume

The lip flip is frequently confused with subtle lip filler.

The visual result can overlap in one respect: a little more of the upper lip may become visible.

The mechanism is completely different.

Small amounts of botulinum toxin are placed to reduce selected activity in the upper orbicularis oris. When the muscular inward roll is softened, the vermilion can evert slightly more at rest or during expression.

No tissue has been added.

This means a lip flip cannot reproduce the volume, projection or structural reshaping available with hyaluronic-acid filler.

For a patient whose problem is that the upper lip disappears primarily because it curls inward during smiling, the mechanism may fit very well.

For a patient with genuinely limited lip volume who wants a substantially fuller mouth, it may under-deliver because the treatment is being asked to create tissue that it does not add.

“I want a lip flip because I do not want filler” is not enough indication

A patient’s preference to avoid filler matters, but it does not determine whether Botox can produce the desired result.

Sometimes a lip is thin because its actual volume is small. Sometimes the visible upper lip becomes small only during smiling because of movement. Sometimes a relatively long cutaneous upper lip influences how much vermilion is visible at rest. Sometimes dental support changes the presentation.

A lip flip only addresses the muscular part of that equation.

If the anatomy does not contain enough lip to expose, relaxing the muscle cannot manufacture it.

This is one reason I prefer to explain the treatment as a small change in lip behaviour rather than a filler substitute.

The same muscle that turns the lip outward also helps the mouth function

The orbicularis oris is not an aesthetic accessory.

It helps close and purse the lips and contributes to drinking, speaking, kissing, whistling and a range of fine oral movements.

That creates a very narrow therapeutic window.

A small change can be aesthetically useful. Too much weakening can make the patient notice difficulty using a straw, controlling certain liquids, pronouncing some sounds or performing movements they previously took for granted.

These effects are usually temporary because botulinum toxin itself is temporary, but that does not make them irrelevant.

Unlike hyaluronic-acid filler, botulinum toxin cannot be dissolved on demand after injection. If the effect is stronger than intended, the main corrective factor is time.

This is why conservative first treatment matters particularly around the lips.

A lip flip should remain subtle enough that the mouth still belongs to the patient

The best result is not an upper lip that has been forced permanently outward.

I want a slight change in the way the vermilion presents while the lip remains mobile and expressive.

This also means the result can vary significantly between patients.

Someone with a strong inward curl may notice a meaningful change. Someone whose lip movement is already relatively neutral may see very little benefit.

I would rather explain that difference beforehand than compensate for a weak indication with more toxin.

Downturned mouth corners are another separate muscle problem

The depressor anguli oris muscles contribute to downward movement of the oral commissures.

In selected patients, strong resting or dynamic downward pull can create an expression that appears sad or stern even when the person does not feel that way.

Botulinum toxin can sometimes soften that pull.

But mouth-corner position is also influenced by age-related tissue changes, surrounding volume, jaw structure and the balance of several neighbouring muscles.

If the corner is low primarily because the lower face has structurally descended, weakening one muscle does not reposition the entire soft-tissue envelope.

The same principle applies: muscle treatment is useful when muscle is meaningfully driving the visible feature.

Smile asymmetry has to be understood before it is “balanced”

Almost every smile contains some degree of asymmetry.

One side may elevate slightly earlier or higher. Dental show can differ. The corners may travel along slightly different vectors.

This is normal variation.

If the asymmetry is clearly driven by unequal muscle pull and it is genuinely bothersome, differential dosing can sometimes improve balance.

But not every asymmetry is muscular. Dental and skeletal differences may contribute. Previous surgery or nerve injury can change movement. A new or suddenly developing facial asymmetry is a medical problem first, not an aesthetic Botox indication.

I therefore do not treat symmetry as a numerical target.

I want to understand whether changing one muscle will actually make the smile function and look more coherent.

Perioral Botox has less room for dosing error than forehead Botox

The forehead tolerates a different treatment philosophy because its muscles perform a different task.

Around the mouth, millimetres matter because neighbouring muscles participate in overlapping functions.

Small changes in placement or dose can alter not only the aesthetic feature being targeted but also the mechanics of the smile.

This is one reason I avoid standardised “lip flip units” or “gummy smile units” as though the number itself defines good treatment.

The same dose in two different patients can have a different functional effect because muscle strength, anatomy and baseline movement differ.

In the perioral region, dose is not simply how much Botox we use.

Dose is how much movement we are willing to change.

The early result should not trigger an early correction

Botulinum toxin develops its effect gradually.

During the first days, one side may appear to respond earlier than the other. The lip can feel different before the final movement pattern has stabilised.

This is not a useful moment to chase every small asymmetry.

I prefer to allow the response to develop before deciding whether a genuine adjustment is needed.

This approach is particularly important around the mouth because additional toxin is easy to give and impossible to take back immediately.

A small residual movement can be corrected later if appropriate.

An over-weakened functional muscle has to recover biologically.

Temporary does not mean instantly reversible

I think this distinction is often lost in Botox marketing.

The effect of botulinum toxin is temporary. Neuromuscular function gradually recovers over time.

But once the toxin has been administered, its effect cannot simply be switched off that afternoon because the patient decides they preferred their previous smile.

This matters more around the mouth than in many other aesthetic regions because the treatment can influence daily functions the patient notices constantly.

Temporary therefore reduces long-term commitment.

It does not remove the need to get the first decision right.

Gummy-smile Botox and lip flip should not automatically be combined

They can coexist in the same patient.

A patient may have excessive upper-lip elevation and also a strong inward curl of the vermilion.

But treating both increases the amount of perioral movement being modified.

I therefore want each component to earn its place.

If reducing elevator activity already creates the desired balance, an additional lip flip may not be necessary. If the main complaint is only a disappearing vermilion border during smiling, treating the gummy-smile elevator pattern may add complexity without benefit.

This is where staged treatment can be useful.

One controlled change can tell us whether another is genuinely required.

Filler and smile Botox solve different problems

Lip filler adds volume and can change shape, projection and contour.

A lip flip changes selected muscular behaviour without adding tissue.

The two can occasionally complement each other, but I do not consider the combination a default upgrade.

If the patient needs actual volume, filler may be the more direct mechanism. If the lip has adequate volume but turns inward during smiling, Botox may be enough. If the anatomy is already balanced, neither may be required.

I prefer to keep those categories clear because a patient who asks for “something very subtle” can otherwise end up receiving two treatments when one small treatment — or none — would have been sufficient.

What a good smile Botox result means to me

I do not want the patient to have a new smile.

I want the existing smile to retain its spontaneity while one excessive component becomes less dominant.

For a muscular gummy smile, that may mean less gingival display without hiding the teeth or flattening the expression. For a lip flip, it may mean slightly more visible upper vermilion without compromising oral function. For downturned corners, it may mean a more neutral resting position rather than a permanently upturned mouth.

The quality of the result is partly defined by what remains unchanged.

The patient should still speak normally, eat normally, drink normally and recognise their own smile.

When smile Botox makes sense to me

I am most comfortable using botulinum toxin around the mouth when a clearly identifiable muscle pattern is producing a feature the patient genuinely wants to modify and the expected benefit justifies altering that movement.

I become more cautious when the gummy smile is predominantly skeletal or dental, when a lip flip is being asked to create real lip volume, when structural ageing is driving mouth-corner position or when the patient expects complete symmetry from a naturally asymmetric moving face.

There are also smiles that simply show gum, lips that become thinner during animation and mouths whose corners are not perfectly horizontal — and none of those facts automatically require treatment.

A smile is supposed to move.

The purpose of Botox is not to discipline that movement into perfection.

It is to modify one excessive muscular pattern when doing so allows the patient’s existing smile to work better for them.

Frequently asked questions

How do I know whether my gummy smile is suitable for Botox?

Botulinum toxin makes the most sense when excessive upper-lip elevation is an important cause of gingival display. If tooth proportions, gingival anatomy or skeletal structure are dominant, dental, periodontal, orthodontic or surgical assessment may be more appropriate.

How much gum show is considered too much?

There is no single number that automatically creates a treatment indication. Gingival display should be considered in relation to the patient’s smile anatomy and, importantly, whether the patient is genuinely bothered by it.

Does gummy-smile Botox change my teeth or gums?

No. It changes selected muscle activity controlling upper-lip elevation. Dental, gingival and skeletal anatomy remain unchanged.

What exactly does a lip flip do?

It reduces selected orbicularis-oris activity so that the upper vermilion can present slightly more outward. It changes lip behaviour rather than adding volume.

Is a lip flip the same as lip filler?

No. Filler adds material and can change volume, contour and projection. A lip flip uses botulinum toxin to modify muscular movement and generally produces a subtler change.

Can a lip flip affect drinking or speech?

It can. Excessive weakening around the mouth may temporarily affect movements such as sipping, whistling or articulating certain sounds. This is one reason conservative dosing is particularly important in the perioral region.

Can Botox correct an asymmetric smile?

It may improve selected asymmetries caused by unequal muscle pull. Structural, dental or neurological asymmetry is a different problem. A sudden new facial asymmetry should receive medical assessment rather than cosmetic treatment.

Can Botox lift downturned mouth corners?

Reducing excessive depressor-anguli-oris activity can soften downward pull in selected patients. If tissue descent or another structural change dominates, the result from muscle treatment will be limited.

How quickly will I see the result?

The effect develops gradually rather than immediately. I prefer to allow the movement pattern to stabilise before deciding whether any small residual asymmetry genuinely needs adjustment.

Can smile Botox be reversed if I dislike it?

Botulinum toxin is temporary, but it cannot be dissolved or switched off on demand. If the effect is stronger than intended, muscle function returns gradually as the biological effect wears off.

How often should smile Botox be repeated?

I do not use a universal maintenance interval. Repeat treatment should depend on the return of the relevant muscle pattern, the patient’s previous response and whether the original indication still exists.

When would you recommend against smile Botox?

I would be cautious when the concern is primarily skeletal, dental or structural; when the expected cosmetic gain is smaller than the functional trade-off; or when the patient wants a degree of volume, lifting or symmetry that muscle relaxation cannot realistically provide.