Sep272026
Clinician performing precise lip flip injection

A Botox lip flip is a short in-office procedure that relaxes a small band of the upper-lip muscle so the lip rolls slightly outward, often making it appear fuller without adding any volume. It tends to work well for people with a naturally thin or tightly curled upper lip, mild vertical lip lines, or a gummy smile, and results usually fade within a couple of months.

TL;DR:

  • A Botox lip flip typically uses 4 to 6 units injected into the orbicularis oris muscle, with effects lasting about two to three months.
  • It is most suitable for individuals with a strong, naturally thin, or curled upper lip, mild vertical lip lines, or a gummy smile seeking subtle enhancement.
  • Patients should avoid the procedure if pregnant, breastfeeding, or with neuromuscular conditions, and should disclose all medications to prevent interactions.
  • Common side effects include temporary difficulty drinking through a straw, mild swelling, bruising, or slight asymmetry, which usually resolve within days.
  • Combining a lip flip with filler can add volume, but the flip alone offers a reversible, lower-risk option for subtle lip refinement.
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Table of Contents

What is a lip flip, and why does it make lips look fuller

The upper lip is controlled largely by the orbicularis oris, a ring-shaped muscle that purses and rolls the lip inward when it contracts. When small amounts of botulinum toxin are placed in the right spots, that muscle relaxes just enough to let the lip evert, or roll slightly outward, exposing more of the pink vermilion border. The lip itself does not gain tissue or volume. It simply unrolls a bit, which is why the change tends to read as subtle rather than dramatic, especially compared with a hyaluronic acid filler that physically adds volume.

Patients typically ask about a lip flip for a few recurring reasons:

  • A thin or tightly curled upper lip that disappears when smiling
  • Fine vertical lines above the lip, sometimes called smoker’s lines
  • A gummy smile, where the upper lip rises higher than it would ideally show

How the injections work and what the dosing evidence shows

Injectors typically target two or three points along the upper-lip border, working within the orbicularis oris fibers rather than deeper muscles used for broader facial movement. Because the muscle sits close to the skin around the mouth, small, precise doses matter more here than in larger muscle groups like the forehead.

A 2025 systematic review found that a lip flip typically uses 4 to 6 units of botulinum toxin A injected into the orbicularis oris, a range associated with consistent upper-lip eversion and improved lip contour across the studies included. That same body of patient experience reporting describes a fairly predictable timeline:

  • Onset within a few days of treatment
  • Peak effect around 1 to 3 weeks after injection
  • Individual variability driven by muscle strength, lip anatomy, and how the dose is distributed across injection points

Because BOTOX Cosmetic units are specific to that product and not interchangeable with other neuromodulator brands, an injector’s familiarity with the exact product in the syringe affects how safely and predictably the dose can be calibrated.

Are you a good candidate for a lip flip

A lip flip tends to suit people who want a subtle change rather than a fuller-looking lip overall. Good candidates often have a naturally strong orbicularis oris that pulls the lip inward when they smile, mild vertical lip lines, or a gummy smile they would like to soften. It also appeals to people who are curious about lip enhancement but want a reversible option before considering filler.

Certain situations call for caution or a different plan altogether:

  • Pregnancy or breastfeeding, when botulinum toxin injections are generally avoided
  • Neuromuscular conditions such as myasthenia gravis, which can heighten sensitivity to toxin effects
  • Active infection or skin breakdown at the injection site
  • Certain medications, including some antibiotics, that can interact with botulinum toxin

Pro Tip: Bring a list of every medication and supplement you take to your consultation, since some combinations change how your provider approaches dosing.

A board-certified injector should evaluate your lip anatomy, smile pattern, and medical history before recommending a specific unit count or injection pattern. There is no single dose that fits every patient.

What to expect before, during, and after your appointment

The appointment itself is brief, but a few steps on either side make it go smoothly.

  1. Disclose all current medications and supplements, and ask your provider whether you should pause any blood thinners beforehand.
  2. At the visit, a topical numbing cream is often applied to the lip area for a few minutes before injections begin.
  3. The injector places the botulinum toxin at two or three points along the upper lip, a process that usually takes only a few minutes once numbing has taken effect.
  4. Afterward, you can typically resume normal activities right away, though providers often suggest avoiding strenuous exercise for about 24 hours.

Short-term effects like mild swelling or slight asymmetry in expression are common in the first day or two as the toxin settles. Pro Tip: A topical anesthetic applied correctly before injection can meaningfully reduce discomfort, and proper application technique matters as much as the product itself. Contact your provider promptly if you notice drooping beyond the treated area, difficulty breathing or swallowing, or weakness that seems to spread past the lip, since these can signal that the toxin has affected muscles beyond the intended site.

How long results last and when to plan a touch-up

Most patients notice the effect settling in within the first one to three weeks and then holding for roughly two to three months before the muscle regains its normal strength and the lip returns to its usual shape. That window varies based on muscle mass, metabolism, and how much toxin was used.

A few practical points to keep in mind when planning ahead:

  • Repeat treatments are typically scheduled once the effect starts to fade rather than on a fixed calendar
  • Some patients add a small amount of hyaluronic acid filler once they know how the flip alone looks on them
  • Because cosmetic injectables are rarely covered by dental or medical insurance, it helps to ask your provider about financing options for cosmetic treatment planning before booking

Lip flip versus fillers: which fits your goals

A lip flip and a hyaluronic acid filler solve different problems, even though both are often discussed under lip enhancement. The flip relaxes muscle to reveal more of the lip you already have. A filler physically adds volume by placing hyaluronic acid gel into the lip tissue, which is why filler tends to create a more noticeable increase in size and shape.

  • A lip flip suits subtle refinement, lasts about two to three months, and carries a lower risk of lumps or asymmetry since nothing is being added
  • A filler suits patients seeking real volume change, lasts considerably longer per treatment, and can be dissolved if the result needs adjusting
  • Combining both is common when a patient wants some added fullness along with a softer, more relaxed lip line, and providers often suggest starting with the flip before adding filler so each layer can be assessed on its own

Public interest in lip flips has grown in recent years, even though fillers remain the more commonly requested option overall.

Side effects and how to keep the procedure safe

Most side effects from a lip flip are minor and temporary. Because the injections affect a muscle involved in pursing and sipping, some patients notice temporary difficulty drinking through a straw, whistling, or fully rounding the lips for a few weeks while the effect is strongest. Bruising or mild swelling at the injection sites is also common and typically resolves within days.

  • Temporary functional changes such as trouble with straws or whistling
  • Mild bruising or swelling at injection points
  • Slight asymmetry in smile or lip shape while the toxin takes full effect

Rare but more serious effects involve the toxin spreading beyond the injection site, which can affect swallowing or breathing.

Prescribing information for BOTOX Cosmetic includes warnings about spread-of-toxin effects and specific dosing precautions.
FDA prescribing information

Choosing a qualified injector who reviews your medication history and dosing carefully, and following up promptly if you notice unusual weakness, remain the most reliable ways to reduce risk.

Why a dental practice’s perspective on perioral Botox matters

Why a dental practice's perspective on perioral Botox matters — overview diagram

Dentists spend their careers studying the muscles, bone structure, and soft tissue that surround the mouth, which gives a dental setting a particular vantage point on procedures like a lip flip. At Florida Special Care Dentistry, facial esthetics treatments including Botox and Juvéderm are offered alongside restorative and cosmetic dental care, so evaluation of your lip line naturally accounts for bite, tooth position, and smile dynamics, not just skin-level appearance.

For patients who feel anxious about needles or injectable procedures in general, the practice’s background in sedation dentistry means comfort options are already part of the conversation, not an afterthought. That combination of perioral anatomy training and a calm, structured approach to anxious patients shapes how a consultation for a lip flip is handled here.

— Florida Special Care Dentistry

Ready to talk through your options with our team

If a subtle, reversible lip flip sounds like the right starting point, or you are weighing it against filler, a consultation is the clearest way to get a plan built around your own lip anatomy and smile pattern. Facial esthetics services including Botox and Juvéderm are available alongside sedation options for patients who feel nervous about injections or dental visits in general.

Florida Special Care Dentistry

A first visit typically includes:

  • A review of your lip shape, smile pattern, and any vertical lip lines or gummy smile concerns
  • A conversation about sedation options if needle anxiety is a factor
  • A personalized recommendation on unit count, injection points, and whether filler makes sense alongside the flip

You can explore the practice’s cosmetic dentistry and facial esthetics services and book a consultation to discuss whether a lip flip fits your goals.

Sources

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

FAQ

Do Botox lip flips actually work?

Yes, for the goal they are designed to achieve: a 2025 systematic review found that 4 to 6 units of botulinum toxin A injected into the orbicularis oris produced consistent upper-lip eversion and improved contour. It works best for subtle enhancement rather than significant volume change, since the lip is not being filled, only relaxed.

How much do lip flips usually cost?

Pricing depends on the provider, geographic market, and whether the treatment is combined with filler, so there is no single published figure that applies everywhere. Florida Special Care Dentistry lists Botox and facial esthetics among its cosmetic services, with pricing available on request during a consultation.

How long does the Botox lip flip last?

Most patients see results settle in within one to three weeks and hold for roughly two to three months before the muscle regains its usual strength. Individual duration varies with muscle mass, metabolism, and the exact dose used.

What are the cons of lip flip?

Temporary functional effects are the most common drawback, including difficulty drinking through a straw, whistling, or fully pursing the lips while the toxin is at peak effect. Mild bruising, swelling, or slight asymmetry can also occur, and because the effect fades within a few months, ongoing results require repeat treatment.