What is a 'Lip Flip' and How Does it Differ from Dermal Fillers?

This article aims to explain what a lip flip is, how it compares to dermal filler treatment, what the science behind each approach involves, and when speaking with a qualified practitioner may be beneficial. As always, individual suitability depends on a thorough professional assessment.

A lip flip is a non-surgical aesthetic procedure that uses a small amount of botulinum toxin — the same substance used in anti-wrinkle treatments — injected into the orbicularis oris muscle surrounding the upper lip. In the UK, botulinum toxin is a prescription-only medicine (POM) and requires a face-to-face consultation and prescription by an appropriately qualified prescriber. By relaxing this muscle, the upper lip gently rolls outward, creating the appearance of a slightly fuller, more defined lip border without adding volume through filler.

The lip flip involves the precise administration of botulinum toxin into specific points along the upper lip's border, targeting the orbicularis oris — the circular muscle responsible for pursing and controlling lip movement. When this muscle is subtly relaxed, the upper lip curls slightly outward and upward, revealing more of the lip's natural vermilion (the visible pink tissue), which can create the impression of a fuller-looking upper lip.

This is a relatively quick procedure, typically involving a small number of injection points and minimal disruption to daily activities. Because botulinum toxin is used rather than a filler substance, no volume is added to the lip itself. The effect is instead one of repositioning — the lip's natural shape is gently altered through controlled muscle relaxation.

It is worth noting that the lip flip is a subtle treatment. Results tend to be modest and are most appreciated by those seeking a natural-looking enhancement rather than a dramatic change in lip size or projection. As with all aesthetic procedures, outcomes vary between individuals, and results are not guaranteed.

This is one of the most common questions patients ask when researching lip enhancement options. While both treatments can be used to address the appearance of the lips, they work in entirely different ways.

Dermal filler treatment uses hyaluronic acid — a naturally occurring substance found in the body — to physically add volume, structure, and definition to the lips. The practitioner injects filler into the lip body, borders, or Cupid's bow to create a more pronounced shape, increased fullness, or improved symmetry, depending on the patient's anatomy and aesthetic goals.

The lip flip, by contrast, does not add any volume. It works solely by influencing the behaviour of the muscle beneath the lip, encouraging the upper lip to display more of its natural surface. This means the two treatments serve different purposes:

Lip flip: subtle repositioning, slight definition of the upper lip, minimal downtime

Dermal filler: volumising, contouring, shaping, or restoring lost volume

Some practitioners may discuss combining both approaches where clinically appropriate, though this would always be based on an individual assessment.

To understand how the lip flip works, it helps to appreciate the role of the orbicularis oris muscle and how botulinum toxin interacts with it.

Botulinum toxin is a purified protein derived from *Clostridium botulinum*. When injected in precise, controlled doses, it temporarily inhibits the release of acetylcholine — the neurotransmitter responsible for triggering muscle contractions — at the neuromuscular junction. This results in a localised, temporary relaxation of the targeted muscle.

In the context of the lip flip, this localised relaxation causes the upper lip border to roll slightly outward. The treatment does not affect the overall strength of the lip for the vast majority of normal activities, though some patients may notice a temporary adjustment period affecting certain movements such as drinking from a straw or pronouncing specific sounds. These effects are temporary and related to the muscle relaxation involved.

Because botulinum toxin is metabolised by the body over time, the results of a lip flip are not permanent. The muscle gradually regains its normal function, and results typically last between two and four months, though individual variation is common.

Hyaluronic acid (HA) is a glycosaminoglycan — a naturally occurring polysaccharide molecule — found abundantly in the skin, joints, and connective tissues of the body. In the skin, it plays a critical role in retaining moisture, maintaining structural support, and contributing to a plump, hydrated appearance.

As we age, the body's natural production of hyaluronic acid declines, contributing to a reduction in skin hydration, facial volume loss, and changes in lip fullness and definition. Injectable hyaluronic acid-based dermal fillers are formulated to integrate with the body's natural tissues, providing volumising support and stimulating an environment conducive to moisture retention.

Modern hyaluronic acid fillers used in lip treatments are cross-linked, meaning the HA molecules are stabilised to resist rapid degradation and prolong their presence in the tissue. Results from lip filler treatment typically last between six and eighteen months depending on the product used, the area treated, individual metabolism, and other factors. Hyaluronic acid fillers are also reversible using an enzyme called hyaluronidase, which provides an important safety consideration.

Understanding realistic outcomes is central to informed decision-making. It is important to approach this section with the understanding that results vary between individuals and are never guaranteed.

Lip flip outcomes may include: A subtle increase in the visible surface of the upper lip A slightly more defined lip border A reduction in the appearance of a lip that turns inward at rest A natural-looking enhancement without added volume

Dermal filler outcomes may include: Increased volume in the lips Enhanced definition of the lip border and Cupid's bow Improved symmetry (where this is a concern) Restoration of volume that may have diminished with age A more structured lip shape tailored to individual anatomy

Neither treatment is appropriate for everyone. A thorough consultation with a qualified practitioner is essential to assess facial anatomy, medical history, and individual aesthetic goals before any treatment is recommended.

There are a variety of reasons why someone might wish to explore lip enhancement options with a qualified aesthetic practitioner. These may include:

A feeling that the upper lip appears thin or lacks definition at rest

Noticing that the upper lip seems to curl inward, particularly when smiling

Age-related changes to lip volume, shape, or border definition

A desire for a more balanced or symmetrical appearance

Curiosity about subtle enhancement without committing to volumising treatment

It is equally important to recognise that these treatments are not suitable for everyone. Certain medical conditions, medications, pregnancy, breastfeeding, and active skin conditions in the treatment area may affect suitability. Concerns about specific facial anatomy or previous treatments should also be raised with a practitioner.

At Pantaleo Clinic in London, consultations provide an opportunity to discuss your concerns, understand treatment options, and receive an honest, individualised assessment without any obligation to proceed. Patients can also request practitioner registration details (such as GMC or GDC where relevant) and confirm CQC status where applicable.

One of the key practical differences between the lip flip and dermal fillers relates to how long results can be expected to last.

Lip flip: Results from a lip flip are temporary by nature. As botulinum toxin is gradually broken down and absorbed by the body, muscle activity returns to normal. Most patients find that results are visible for approximately two to four months, though this varies depending on individual metabolism, the amount of product used, and lifestyle factors. Those who use their lip muscles frequently — such as wind instrument musicians or vocalists — may find results last toward the shorter end of this range.

Dermal fillers: Lip dermal fillers generally offer a longer-lasting result than a lip flip, with most hyaluronic acid-based products providing visible results for approximately six to eighteen months. Longevity is influenced by the specific product used, the volume injected, the area treated, individual metabolism, and physical activity levels. Maintenance appointments are often discussed during the consultation to help patients plan accordingly.

Following any aesthetic procedure involving injections to the lip area, certain aftercare measures are generally recommended by practitioners. While specific guidance will be provided during your appointment, the following general principles apply to many patients:

Immediately following treatment: Avoid touching or applying pressure to the treated area Refrain from applying makeup directly to injection sites until advised otherwise Avoid extreme heat, including saunas, steam rooms, and intense exercise, for the first 24 to 48 hours Avoid alcohol in the immediate post-treatment period

General skin and lip health: Keep the lips well hydrated using a gentle, fragrance-free lip balm Apply SPF protection daily, as UV exposure can contribute to collagen degradation and skin ageing Maintain adequate fluid intake and a balanced diet to support overall skin health Follow any specific aftercare instructions provided by your practitioner

If you notice unexpected swelling, bruising, or any changes at the treatment site that concern you, contact your clinic promptly.

A balanced understanding of any aesthetic treatment includes acknowledging both its potential benefits and its limitations.

Potential Benefits

The lip flip offers a subtle, natural-looking enhancement without adding volume Dermal fillers can provide more pronounced, customisable results for those seeking volumising or contouring Both treatments are non-surgical and typically involve minimal downtime Hyaluronic acid fillers are reversible, providing an additional safety consideration

Limitations and Considerations

Neither treatment offers permanent results

The lip flip is limited in scope — it cannot add volume or significantly reshape the lip

Dermal fillers carry risks including swelling, bruising, asymmetry, and, in rare cases, more serious complications such as vascular occlusion; patients concerned about this should read lip filler migration prevention and treatment

Results are influenced by individual anatomy, practitioner technique, and product choice

Botulinum toxin may temporarily affect certain lip movements following a lip flip

Individual variation means results cannot be predicted with certainty

Realistic Expectations

Patients considering either treatment benefit from having an honest, open conversation with a qualified practitioner about what is achievable for their specific anatomy and goals. Aesthetic treatments can complement one's natural features, but they cannot replicate another person's results, and outcomes will always vary.

A lip flip uses botulinum toxin to relax the orbicularis oris muscle, gently rolling the upper lip outward for a subtly fuller appearance — without adding volume.

Dermal fillers use hyaluronic acid to physically add volume, shape, and definition to the lips and are a distinctly different treatment approach.

The lip flip typically lasts two to four months; lip dermal fillers may last six to eighteen months depending on the individual and product used.

Neither treatment is suitable for all patients — individual assessment by a qualified practitioner is essential before proceeding.

Both treatments carry potential risks and side effects that should be discussed thoroughly during a professional consultation.

Realistic expectations, informed consent, and aftercare adherence are all important aspects of any aesthetic treatment journey.

The lip flip and dermal fillers are both established aesthetic procedures that address the appearance of the lips, but they do so in fundamentally different ways. The lip flip uses botulinum toxin to gently reposition the upper lip through targeted muscle relaxation, offering a subtle, temporary enhancement without added volume. Dermal fillers, in contrast, physically introduce hyaluronic acid into the lip tissue to create volume, definition, and shape — with results that typically last longer.

Understanding these differences is an important first step for anyone researching their options. However, knowing which approach — if either — may be appropriate for you is a question that can only be answered through a thorough, face-to-face assessment with a qualified aesthetic practitioner.

Treatment suitability, risks, and expected outcomes should always be assessed individually during a professional consultation.

If you have questions about lip enhancement options or would like to discuss your concerns with an experienced practitioner, we encourage you to reach out to the team at Pantaleo Clinic and explore a personalised treatment plan.