Two different treatments — not two versions of the same thing
The lip flip and lip filler are both lip treatments, but they work through completely different mechanisms and produce meaningfully different results. Choosing between them is not about which is "better" — it is about which matches what you actually want. The confusion happens because both can make lips appear fuller, but they do it in fundamentally different ways.
How the lip flip actually works
The lip flip is one of the most misunderstood treatments in aesthetics — largely because patients often expect it to add volume, and then are surprised when it doesn't. A lip flip does not add volume. It changes the resting position of the upper lip.
A small amount of Botox (typically 4–6 units) is injected into the orbicularis oris muscle just above the upper lip border. This causes the muscle to relax, which allows the upper lip to roll slightly outward and upward — revealing more of the lip's red surface (called the vermillion). The result is more lip "show" — particularly when you smile, where the upper lip tends to thin and roll inward. The lip itself has not changed in size. It is now positioned differently.
This makes the lip flip an excellent treatment for patients who feel their upper lip disappears when they smile, patients who want more lip definition without added volume, and patients new to lip treatments who want a low-risk introduction. It wears off completely in 8–12 weeks — at which point the muscle returns to normal.
How lip filler actually works
Lip filler uses hyaluronic acid — a substance naturally found in the body — injected directly into the lip tissue to physically increase volume, define the lip border, and improve overall lip shape. Unlike the lip flip, filler does add measurable volume. The result is visible immediately, lasts 6–12 months, and can be dissolved with hyaluronidase if needed.
The specific filler product matters. Softer, more flexible fillers (like RHA 2 or Juvederm Volbella) are appropriate for the lips — they move naturally with facial expression and do not create a stiff or unnatural result. Stiffer, more structural fillers should not be used in the lips. At Plump, Dr. Mortazavi selects the product based on your lip anatomy and goal — not a one-size-fits-all approach.
Natural lip filler results come from precise placement and appropriate volume — not the product brand on the label. Half a syringe is often sufficient for patients who want definition without dramatic volume change. A full syringe is appropriate for patients who want noticeable volume restoration or enhancement.
The full comparison
Who should choose which
Combining both — when it makes sense
Lip filler + lip flip together
Combining a small amount of filler with a lip flip produces a result that neither achieves alone. The filler adds volume and defines the border; the lip flip relaxes the muscle above so more lip is visible. This combination is popular for patients who want natural fullness with enhanced lip show — the combined result looks more effortless than either treatment in isolation. At Plump, Dr. Mortazavi assesses whether the combination is appropriate at consultation based on your anatomy and goal.
A third option — SkinVive for lip hydration
Not every patient wants more volume or shape change. Some patients simply want their lips to look healthier, more hydrated, and less lined. For these patients, SkinVive by Juvederm — a low-density hyaluronic acid micro-injection that hydrates the lip tissue from within — offers visible improvement in lip texture and moistness without any volume change. It is a fundamentally different product from standard filler, designed for skin quality rather than volume. At Plump it is $499 and lasts approximately 6 months.
The most common mistake: Patients who want subtle enhancement choose filler, get too much volume, and then wish they had started with a lip flip. The lip flip is genuinely the right starting point for many patients — not a compromise. If you are unsure which you want, a consultation at Plump will clarify which matches your anatomy and goal before any treatment is booked.