Someone sits down with a photo on their phone and asks for Russian lips and a lip flip. Same sentence. Same appointment. The injector hears two treatments. The searcher heard two names that both promised a taller upper lip.
That collision is the whole problem. Autocomplete treats "Russian lips" and "lip flip" as neighboring styles. Clinics treat them as different mechanisms, different products, and different units. If you are building a catalogue, a booking form, or a preview tool, the names are a data-model bug, not a copywriting one.
Two treatments, one search box
A lip flip is typically a neuromodulator. It relaxes the muscle that pulls the upper lip inward so the lip can evert a little. No gel is added. Nothing is measured in millilitres. The change is in how the lip sits, not how much tissue is there.
A filler look is volume placement. Gel goes into height, central fullness, or forward projection. The unit is millilitres. The product family (Juvéderm, Restylane, RHA, Revanesse) is how that placement is approximated, not the name of the look.
Collapse those into one dropdown labelled "styles" and you serve the wrong thing. A searcher typing "lip flip simulator" is often trying to see eversion on their own photo. A searcher typing "Russian lips" is asking for a taller, flatter-from-the-side shape. Those can be discussed in the same visit. They are not interchangeable, and they should not share a single slider.
LookPrep keeps them separate on purpose. On your own photo you pick named filler looks and how much of each, plus a lip flip. The demo face compares stored product and amount options instead. The flip is dosed in units because it everts the upper lip rather than adding volume.
A look is a shape brief, not a SKU
The useful model is three layers:
- Look: where volume is meant to go. Height and a lifted Cupid's bow. Soft fullness in the centre. Forward projection.
- Product family: the gel used to approximate that look.
- Technique: how an injector actually places it, which no consumer preview can perform.
Russian lips sits in layer 1. Sources describe it consistently: 0.5-1 mL typical, height and a lifted Cupid's bow rather than a forward pout, taller from the front, flatter from the side. It is still a style name. No source LookPrep found gives a validated, standardized medical definition of the label.
"I want Russian lips" is not an order for a syringe. It is a brief about silhouette. The same brief can be approximated with more than one product family. The injector still decides what is realistic for that anatomy.
The rest of a clean catalogue is the same kind of object:
- Cherry lips: soft, rounded fullness in the centre, corners left quiet.
- Cupid's bow definition: 0.2-0.5 mL typical. Targeted sharpening of the two peaks, little added volume.
- Natural enhancement: 0.5-1 mL typical. Conservative volume, existing proportions kept.
- Doll lips: central roundness plus a strongly defined Cupid's bow. LookPrep treats this as two other styles combined, not a third technique.
Product families belong in layer 2. They are references for a consult, not the look itself. LookPrep is independent and is not affiliated with or endorsed by any manufacturer.
Why butterfly, keyhole, and heart-shaped are fights
Some labels map to one placement. Some map to two opposite placements. Some are aliases. If you have shipped a taxonomy for user-generated tags, this is familiar: the display name is not the entity.
Butterfly lips (0.3-0.6 mL typical) is a direct contradiction, not a nuance. Practitioner-education material describes central lift with lateral bulk avoided. Clinic marketing describes volume fanning outward for width. Opposite placements, one name. Anyone asking for butterfly lips should be asked which they mean.
Keyhole lips agrees on a small visible gap at rest, with fullness either side of centre. Sources disagree on whether the style is current. 2026 trade commentary describes demand shifting toward softer, less structured results. The 2019-era picture people search is often not the version a clinic would do now.
Heart-shaped lips overlaps with Russian lips and butterfly lips. All three are described as producing a heart-shaped upper lip. What separates them in practice is how much of the effect comes from height versus border work, and sources do not draw that line consistently.
A catalogue that publishes one official butterfly or heart-shaped outcome is asserting more than the evidence supports. LookPrep leaves those three selectable in the preview and marks that sources disagree. Only four looks get their own definition pages: Russian, cherry, Cupid's bow definition, and natural enhancement. The looks index is explicit about that split. Shipping the disagreement next to the name is more honest than forcing a single row.
What a lip flip preview is actually answering
"Lip flip simulator" is a reasonable query. The question underneath is usually: if we do not add volume, and we only change how the upper lip sits, what does that look like on my face?
A filler preview answers a different question: if volume goes here, at this amount, approximated with this product family, how does the silhouette change from the front?
Both can live on one photo. Mixing the units trains the user to treat muscle change as a smaller filler.
LookPrep's flow is photo or demo face, then looks and amounts, then side-by-side compare (drag, switch, save). Catalogue drawings illustrate each shape over an untreated lip outline. They are not previews of your result. On a real photo, the useful output is a labelled comparison you can take to a consult, not a promise.
The Russian lips page is blunt about the engine limit: it can render product and dose, and a lip flip as upper-lip eversion, but it does not render vertical column placement. A preview shows the kind of change the style aims at, not the technique itself.
A makeup filter or a prompt to a general image model will give you a prettier mouth. It will not tell you whether the change came from height, from central gel, or from muscle.
What a preview can and cannot show
Can show
- A planning visual of named looks on your photo or a demo face.
- Side-by-side differences: height-led versus centre-led versus conservative volume.
- A lip flip direction as a separate choice, because it is not filler.
- The product family each look is approximated with, as a consult reference, not a prescription.
- That some labels are contested, so you do not walk in assuming one TikTok still means one placement.
Cannot show
- Whether you are a candidate.
- How your tissue, muscle, or existing filler will actually respond.
- The injector's technique, including the vertical columns often described for Russian lips.
- A medical prediction, a before-and-after guarantee, or a standardized technique under a street name.
LookPrep is a planning visual. It is not medical advice. A qualified provider decides what is realistic and safe. Photos are private by default; you choose what to share; storage is encrypted and protected; deletion is available on request. Pricing starts from $19. There is no package quiz. The price updates with the looks you select.
If the line is "Russian lips and a lip flip," split it. Russian lips is a height-led filler brief (typically 0.5-1 mL): a look, not a product. A lip flip is muscle, not volume. Butterfly, keyhole, and heart-shaped are labels sources do not share.
Search boxes collapse those into adjacent autocomplete rows. Clinics, and any honest preview, have to pull them apart again. The useful artifact is not a prettier selfie. It is a labelled comparison that makes the disagreement visible before anyone books.
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