Where to Inject Botox for Lip Flip?

Botox for a lip flip is injected into the superficial fibers of the orbicularis oris muscle, the circular muscle that surrounds the mouth. The injections are placed just 1 to 2 millimeters above the upper lip’s vermilion border, which is the line where the pink lip tissue meets the surrounding skin. A typical lip flip uses 4 to 6 total units of Botox divided across 2 to 4 micro-injection points along the upper lip. The small dose relaxes the muscle fibers that pull the upper lip inward, allowing the lip to roll gently outward and reveal more of the pink vermilion. The result is a subtle, natural-looking enhancement that makes the upper lip appear fuller without adding any actual volume.

This article explains exactly where each injection goes, how the procedure works on the muscle level, how many units you need, how a lip flip compares to lip filler, what the results look like, and what to expect during recovery. Whether you are considering a lip flip for the first time or want to understand the anatomy behind it, this guide covers the full picture.

What Is a Botox Lip Flip?

A Botox lip flip is a non-surgical cosmetic procedure that uses a small amount of botulinum toxin to relax the muscle fibers around the upper lip, causing the lip to roll slightly outward and show more of its natural pink surface. The procedure takes approximately 5 to 10 minutes and involves just a few tiny injections above the upper lip line. Unlike lip fillers, which add physical volume to the lip tissue using hyaluronic acid, a lip flip changes how the muscle moves rather than how much tissue the lip contains.

The orbicularis oris muscle contracts every time you speak, eat, smile, or pucker your lips. In some people, that contraction pulls the upper lip inward, hiding the vermilion and making the lip appear thinner than it actually is. A lip flip relaxes the specific fibers responsible for that inward pull. Once those fibers stop contracting as tightly, the upper lip naturally curls outward, revealing a fuller-looking lip border and a more defined Cupid’s bow. The effect is subtle and natural. A lip flip does not create a dramatically larger lip; it simply lets the lip you already have show itself more fully.

Google search interest in “lip flip” has increased by an average of 33% per month over the past decade, according to a 2025 study in the Journal of Cosmetic Dermatology. The lip augmentation market overall is projected to reach $11.6 billion by 2030. Much of that growth comes from patients who want a conservative, low-commitment enhancement rather than a full volume augmentation, and the lip flip fits that demand perfectly.

Where Exactly Is Botox Injected for a Lip Flip?

Botox for a lip flip is injected into the superficial layer of the orbicularis oris muscle at 2 to 4 specific points along the upper lip, placed just above the vermilion border in the white skin (cutaneous lip) rather than inside the pink lip tissue itself. This placement targets only the outermost muscle fibers that pull the lip inward. Deeper injection would affect the muscle fibers responsible for lip closure, speaking, and eating, which is why shallow, precise placement is essential.

The injection points follow a symmetrical pattern around the Cupid’s bow, which serves as the central anatomical landmark. Two central injection points sit just lateral to the peaks of the Cupid’s bow, in the superficial orbicularis oris immediately above the vermilion border. These central points produce the primary “flip” of the upper lip. When the injector adds lateral points, they place them approximately 5 to 8 millimeters outward from the central injections, still above the vermilion border, moving toward the corners of the mouth. The lateral points help balance the eversion across the full width of the upper lip so the result looks even from one side to the other.

The “red line rule” is the most important placement principle for a lip flip. All injections must stay in the white skin above the lip, never crossing into the pink or red vermilion tissue. Injecting into the vermilion itself can disrupt lip closure, cause difficulty drinking, produce slurred speech, or create an asymmetric smile. The red line rule is what separates a well-executed lip flip from one that causes functional problems. An experienced injector like Nurse Joi marks each injection site before the needle touches the skin, verifying that every point stays above the vermilion border and within the superficial muscle layer.

Injection depth matters as much as injection location. The needle enters the skin at a shallow angle, targeting only the pars marginalis, the outermost portion of the orbicularis oris. According to a 2026 case series published in Clinics in Dermatology, anatomically guided low-dose injection into the pars marginalis produces subtle upper lip eversion and reduces vertical lip lines (perioral rhytides) in selected patients. Deeper injection into the body of the orbicularis oris affects the muscle fibers that control lip seal and articulation, which creates unwanted side effects rather than cosmetic improvement.

How Many Units of Botox Do You Need for a Lip Flip?

A lip flip typically requires 4 to 6 units of onabotulinumtoxinA (Botox Cosmetic) total, divided across the 2 to 4 injection points. Each injection point receives approximately 1 to 2 units. This is one of the lowest-dose Botox treatments available. For comparison, forehead lines typically require 10 to 30 units, and crow’s feet require 12 to 24 units. The small dosage is what makes the lip flip both subtle and safe.

A 2025 systematic review in the Archives of Dermatological Research examined seven clinical studies on the lip flip procedure and confirmed that 4 to 6 units of botulinum toxin type A injected into the orbicularis oris produces consistent upper lip eversion with high patient satisfaction and only mild, transient side effects. The review noted that dosing should be conservative, especially for first-time patients, because the orbicularis oris is a highly active muscle that participates in every speaking, eating, and drinking motion throughout the day. Over-relaxing it even slightly can interfere with daily functions.

Starting with 4 units and adding more at a follow-up appointment is the safest approach. Every patient’s orbicularis oris has a different thickness and contractile strength. A patient with a thin, less active upper lip muscle may achieve full results with 4 units, while a patient with a stronger muscle may need the full 6 units. Your injector should assess your muscle activity during your consultation and choose the dose based on what your anatomy needs, not a one-size-fits-all number. According to the American Society of Plastic Surgeons (ASPS), 9,883,711 neurotoxin procedures were performed in 2024, and the lip flip has become one of the fastest-growing applications within that category.

Does a Botox Lip Flip Make Your Lips Look Bigger?

A Botox lip flip does not actually make your lips bigger because it adds no physical volume to the lip tissue. What it does is change the position of the upper lip by relaxing the muscle fibers that curl it inward. The lip rolls outward (a process called eversion), which reveals more of the pink vermilion that was previously hidden. The result looks like a fuller lip, but the lip itself has not changed in size.

A 2026 prospective study published in Aesthetic Plastic Surgery confirmed this mechanism in 17 women who received 4 units of onabotulinumtoxinA for a lip flip. Researchers used stereophotogrammetry (3D facial imaging) to measure the upper lip at multiple time points. Upper lip height increased significantly at day 15 (p = 0.011), confirming visible eversion. However, actual lip volume showed no measurable change. Patient satisfaction was high, with a FACE-Q mean score of 79.2 out of 100 and a GAIS (Global Aesthetic Improvement Scale) median score of 1, indicating patients perceived meaningful improvement despite the absence of volume increase.

Patients who want actual volume, meaning a lip that is physically thicker and fuller, need dermal fillers rather than a lip flip. Many patients choose to combine both treatments: the lip flip handles the muscle positioning, and a small amount of hyaluronic acid filler adds the structural volume. The combination produces a natural result that neither treatment achieves as effectively on its own.

What Is the Difference Between a Lip Flip and Lip Filler?

The difference between a lip flip and lip filler is that a lip flip relaxes the orbicularis oris muscle to change lip position, while lip filler adds hyaluronic acid directly into the lip tissue to increase volume and shape. These are two fundamentally different mechanisms producing two different types of results. A lip flip is about muscle activity. Lip filler is about tissue structure.

Patients in Lee’s Summit and the Kansas City area often ask us which option is right for them. The answer depends on the goal. If you want a subtle change that makes your existing lip more visible without adding size, the lip flip is the better choice. If you want noticeably fuller, shapelier lips, filler delivers that result. If you want both, the combination of a Botox Cosmetic lip flip and a conservative amount of filler creates natural-looking definition and volume together. We often recommend the lip flip as a starting point for patients who have never had any lip treatment before, because it lets them see how a small change feels before committing to filler.

Does a Lip Flip Help With a Gummy Smile?

Yes, a lip flip helps with a gummy smile by relaxing the muscle fibers that pull the upper lip too high when you smile, which reduces how much gum tissue shows above your teeth. A gummy smile (the clinical term is excessive gingival display) happens when the upper lip elevates higher than normal during a full smile, exposing more than 2 to 3 millimeters of gum tissue. The orbicularis oris muscle and the levator labii superioris muscle both contribute to how high the upper lip lifts during a smile.

A lip flip targets the orbicularis oris specifically, and that targeted relaxation limits how far the upper lip rises. The lip stays slightly lower during a full smile, covering more of the gum line. The effect is subtle enough that you still look natural when you smile, but the excessive gum display decreases noticeably. Patients who want more aggressive gummy smile correction may need additional Botox placed into the levator labii superioris muscle above the nostrils, which is a separate injection that addresses the primary elevator muscle rather than the orbicularis oris. Your injector should assess your smile pattern during the consultation to determine whether the lip flip alone will produce enough correction or whether treating additional muscles is warranted.

How Soon Will I See Lip Flip Results?

You will see lip flip results starting around 3 to 7 days after the injection, with full results visible at approximately 10 to 15 days. The Botox needs time to bind to the nerve terminals in the orbicularis oris and block acetylcholine release. That binding process begins within hours but takes several days to produce a visible change in muscle activity. You may notice a slight softening of the upper lip at day 3 or 4, with the full “flip” effect developing gradually over the next week.

The 2026 Aesthetic Plastic Surgery study confirmed this timeline: upper lip height reached its peak increase at day 15, then gradually returned toward baseline by day 30 and day 90. By 2 to 4 months after the injection, the nerve endings regenerate their connection to the muscle, and the lip returns to its normal resting position. The duration of Botox in the lip area is shorter than in the forehead because the orbicularis oris is one of the most active muscles in the face. Constant talking, eating, and facial expressions cause the nerve-to-muscle connection to rebuild faster than in muscles that contract less frequently.

Most providers schedule a follow-up appointment at approximately 2 weeks after the lip flip to assess the result at its peak. If the eversion is insufficient, a small touch-up of 1 to 2 additional units can be added at that appointment. If the result is right, the next full treatment is scheduled 2 to 4 months later to maintain the effect. Patients who keep up with consistent treatment cycles often find that their results last slightly longer over time because the orbicularis oris weakens gradually from repeated relaxation.

Can a Botox Lip Flip Go Wrong?

Yes, a Botox lip flip can go wrong if the injections are placed too deep, too close to the vermilion, too lateral toward the mouth corners, or if too many units are used. Because the orbicularis oris controls essential daily functions like speaking, eating, drinking, and lip seal, even a small placement error can produce noticeable functional problems. The most common cause of a lip flip gone wrong is over-relaxation of the muscle, where too much Botox weakens the lip beyond the intended cosmetic effect.

Watch for these warning signs after a lip flip:

• Difficulty closing your lips fully around a straw, cup, or water bottle
• Drooling or leaking liquid from the corners of the mouth while drinking
• Slurred or imprecise speech, especially difficulty with sounds that require lip closure (like “P,” “B,” and “M”)
• Asymmetry where one side of the upper lip flips more than the other
• Inability to whistle or pucker the lips normally
• A smile that looks uneven or pulled to one side

These side effects are temporary and resolve as the Botox wears off, typically within 4 to 8 weeks. Botox cannot be dissolved the way hyaluronic acid filler can, so prevention is the most important strategy. Choosing an experienced injector who understands lip anatomy and follows conservative dosing is the single most effective way to avoid a lip flip gone wrong. The 2025 systematic review in Archives of Dermatological Research noted that all reported side effects in the seven studies reviewed were mild and transient, confirming that the lip flip has a strong safety profile when performed correctly.

What Should You Not Do After a Botox Lip Flip?

What you should not do after a Botox lip flip includes rubbing or pressing on the lip area, engaging in strenuous exercise, lying flat, applying excessive heat to the face, and receiving other facial treatments in the lip area for at least one to two weeks. The aftercare rules for a lip flip follow the same principles as general Botox aftercare, with a few lip-specific additions.

1. Do not touch, press, or massage the upper lip area for at least 4 hours after the injection. Pressure can push the Botox into unintended areas of the orbicularis oris or adjacent muscles.
2. Stay upright for at least 4 hours. Do not bend over at the waist or lie flat. Gravity can redirect the product during the initial settling window.
3. Avoid strenuous exercise for 24 hours. Elevated heart rate and blood pressure increase facial blood flow, which raises the risk of Botox migrating from the injection site.
4. Skip hot drinks for the first few hours. Heat near the lip area can increase swelling and potentially affect how the Botox settles in the muscle.
5. Avoid alcohol for 24 hours. Alcohol thins the blood and increases bruising risk at the injection sites.
6. Do not get chemical peels, facials, microdermabrasion, or any treatment that involves pressure on the lip area for at least two weeks.
7. Avoid wearing tight masks, sports mouthguards, or anything that presses against the upper lip for 24 hours.
8. Use a straw carefully for the first few days. Some patients notice temporary difficulty with lip seal around a straw during the first week. This is normal and resolves as the lip adjusts to the new muscle activity level.

Drinking lots of water, staying well-hydrated, and keeping the lip area moisturized with a gentle lip balm all support smooth recovery. Mild swelling at the injection sites typically resolves within 12 to 24 hours. Bruising is uncommon with a lip flip because the needle is very small and the injection volume is minimal, but a small bruise can appear if a tiny blood vessel is nicked. Any bruise from a lip flip is typically gone within 3 to 5 days.

Frequently Asked Questions

Do Lips Go Back to Normal After a Lip Flip?

Yes, lips go back to normal after a lip flip once the Botox wears off. The orbicularis oris muscle gradually regains its full contractile strength as the nerve endings regenerate over 2 to 4 months. The lip returns to its pre-treatment position and movement pattern. No permanent changes occur. If you decide not to repeat the treatment, your lips will look exactly the same as they did before.

How Painful Is a Lip Flip Procedure?

A lip flip procedure causes minimal pain for most patients. The injections use a very fine needle (typically 30 to 32 gauge), and the total injection volume is extremely small. Most patients describe the sensation as a brief pinch or sting at each injection point, lasting less than a second. The entire procedure takes approximately 5 to 10 minutes. Some providers apply a topical numbing cream before the injection, but many patients find it unnecessary given how quick and mild the treatment is.

Can You Overdo a Lip Flip?

Yes, you can overdo a lip flip by using too many units or placing injections too broadly across the orbicularis oris. Over-treatment relaxes the muscle beyond the cosmetic benefit and into functional impairment. Patients who receive too many units may struggle with drinking, speaking, or maintaining lip seal. The standard 4 to 6 units produces the optimal balance between cosmetic improvement and preserved function. Going higher than 6 units for a first treatment is rarely necessary and increases the risk of side effects without proportionally improving the result.

Is It Okay to Smile After a Lip Flip?

Yes, it is okay to smile after a lip flip. In fact, gentle facial movements like smiling may help the Botox settle into the targeted nerve receptors. A lip flip does not prevent smiling. It slightly reduces how far the upper lip curls inward during a full smile, which can actually make your smile appear more balanced and less “gummy.” You should avoid exaggerated or forced facial movements for the first 4 hours, but normal smiling is perfectly safe.

Can You Combine a Lip Flip With Lip Filler?

Yes, you can combine a lip flip with lip filler for a comprehensive lip enhancement. The lip flip handles the muscle component by preventing the inward curl, while the filler adds structural volume and definition to the lip tissue itself. Many injectors perform both treatments in the same appointment. The Botox goes into the superficial muscle above the vermilion border, and the filler goes into the lip body below it. The two products work in different tissue layers and do not interfere with each other.

How Long Does a Lip Flip Last?

A lip flip lasts approximately 2 to 4 months. The shorter duration compared to Botox in other facial areas (like the forehead, which lasts 3 to 4 months) occurs because the orbicularis oris is one of the most active muscles in the face. Constant movement from speaking, eating, and facial expressions accelerates nerve regeneration and shortens the window of visible relaxation. Patients who want to maintain their lip flip results year-round typically schedule treatments every 8 to 12 weeks. The Botox vs Xeomin choice for lip flips comes down to your injector’s recommendation and your personal response to each product.

Wrapping It Up

A Botox lip flip is one of the simplest and most subtle cosmetic treatments available, but the results depend entirely on where the injections are placed. The target is the superficial orbicularis oris muscle, just above the vermilion border, at 2 to 4 precisely mapped points along the upper lip. A conservative 4 to 6 units relaxes the muscle enough to produce a gentle outward roll that reveals more of the natural pink lip. The result appears within a week, peaks around day 15, and lasts 2 to 4 months. The lip flip does not add volume, but it changes how the upper lip sits and moves, creating the appearance of fullness without filler.

If you are curious about a lip flip or want to discuss whether it is right for your goals, we would love to help. At Slimming Solutions Med Spa in Lee’s Summit, Nurse Joi has been performing precise, pain-free Botox injections since 2014 and brings a Master Injector’s eye for symmetry and proportion to every treatment. Call us at (816) 524-3438 to schedule your consultation.