How V-Line Surgery Works
V라인 성형 (V-rain seonghyeong, V-line facial contouring surgery) is a set of surgical procedures designed to reduce the width and squareness of the lower face and taper it into a narrower, pointed silhouette when viewed from the front. The name describes the target shape — a lower face that narrows from the cheekbones to the chin in a V form — rather than a single named operation.
The lower jaw is composed of two anatomical targets. The mandibular angle (하악각, ha-ak-gak) is the back corner of the jawbone on each side, where the jaw turns upward toward the ear. In patients with a square or wide lower face, prominent mandibular angles are a primary contributor to that width. The chin (이부, i-bu) is the forward projection of the mandible’s midline; its shape — wide, short, rounded, or asymmetric — determines how the face terminates at its lowest point.
Surgery addresses both targets in a single operative session. The surgeon accesses the mandible entirely through incisions inside the mouth, along the lower gum line — no external skin cuts are made. From this access point, an oscillating saw is used to perform osteotomies (bone cuts) that remove or reposition bone at the angle and chin according to the pre-operative plan.
Surgical planning is not improvisational. Before any V-line procedure, a 3D CT scan of the skull is taken. This imaging maps the exact bone geometry, the path of the inferior alveolar nerve (a sensory nerve running inside the mandible that supplies feeling to the chin, lower lip, and lower teeth), and the positions of dental roots. The surgeon uses this data to plan precisely where cuts can be made without transecting the nerve or destabilising teeth. Clinics that proceed without 3D CT imaging have not performed the baseline assessment the procedure requires.
General anesthesia is used. Operative time for a combined angle-reduction plus genioplasty session ranges from approximately 2–3 hours depending on the complexity of the bone work. Plastic surgery and dermatology collectively account for the largest share of procedures sought by international patients in Korea,¹ and V-line surgery is among the more technically demanding operations within that category.
Procedure Combinations: What V-Line Actually Includes
The phrase “V-line surgery” is used loosely — by clinics and patients alike — to describe anywhere from a single-site chin procedure to a full three-component mandibular reshaping. Understanding which components address which anatomical problem determines whether a given combination is appropriate for a given patient.
Four discrete operations are combined in varying configurations:
Mandibular angle reduction removes the flared or enlarged bone at the back corners of the jaw. The surgeon resects (cuts away) a wedge of bone from the inferior and posterior margin of each angle. This reduces the width of the lower face at its widest point and softens the visible squareness of the jaw when viewed from the front or three-quarter angle.
Outer cortex shaving (also called long-curve osteotomy) does not remove the angle itself but shaves the outer surface of the mandible along its lower edge in a continuous sweep from the angle toward the chin. This reduces jaw prominence in patients whose squareness is distributed along the body of the jaw rather than concentrated at the angle.
Chin reduction (T-osteotomy) removes a horizontal segment of bone from the chin to reduce its vertical height and/or width. A T-shaped cut is made, a block of bone is removed, and the remaining segments are fixed with titanium plates and screws.
Chin advancement or repositioning (sliding genioplasty) cuts the chin free and moves it forward, backward, or to one side to correct projection, vertical height, or midline asymmetry. Unlike chin implants (which add volume without moving bone), sliding genioplasty repositions the patient’s own bone and is fixated with hardware.
| Procedure | What it corrects | Bone removed/moved | Incision location | Can be isolated? | Nerve risk | Recovery impact |
|---|---|---|---|---|---|---|
| Mandibular angle reduction | Square jaw / wide lower face at the rear corners | Bone resected from angle margins | Intraoral (lower gum line) | Yes | Moderate — inferior alveolar nerve proximity | High — swelling at jaw angles lasts 3–6 months |
| Outer cortex shaving (long-curve osteotomy) | Diffuse jaw width along mandible body | Outer cortical bone layer shaved | Intraoral (lower gum line) | Yes | Low–moderate | Moderate — less swelling than angle resection |
| Chin reduction (T-osteotomy) | Wide or vertically long chin | Bone block removed; segments reapproximated | Intraoral (lower gum line) | Yes | Moderate — mental nerve at chin midline | Moderate — chin numbness common short-term |
| Chin advancement (sliding genioplasty) | Recessed chin / projection deficit / asymmetry | Chin segment cut and repositioned; titanium fixation | Intraoral (lower gum line) | Yes | Moderate — mental nerve | Moderate — swelling and temporary numbness |
| Full V-line (angle + cortex shaving + chin) | Wide square jaw with poorly defined chin — full lower face | Angle bone + cortical layer + chin segment | Intraoral (lower gum line) | Combined session | Higher cumulative — multiple nerve proximity points | High — combined swelling; 9–12 months to full result |
The decision to combine procedures versus isolate one is clinical, not commercial. A patient whose lower face width derives primarily from bone at the angles does not automatically benefit from adding chin work. Conversely, performing angle reduction without addressing a wide or blunt chin may produce a result where the jaw is narrower but the overall lower face still lacks the taper the patient wanted. The 3D CT consultation — not a photo assessment — is where this determination is made.
Candidacy and Consultation Requirements
Often a good candidate
- Patients whose lower facial width is driven by structurally prominent mandibular angles visible on 3D CT imaging — where bone, not soft tissue, is the primary contributor to squareness
- Patients with a square or wide jaw that does not harmonise with desired facial proportions and who understand the full 9–12 month result timeline
- Patients willing to commit to a minimum of 7–10 days in Korea post-operatively for initial recovery monitoring and suture management, with understanding that a follow-up visit at 3–6 months is clinically useful
- Patients over 21 in whom facial bone growth is complete, with no active dental disease and cleared for general anesthesia
Should reconsider or wait
- Patients whose facial width is driven primarily by masseter muscle hypertrophy (enlarged chewing muscles) rather than bone — in these cases, botulinum toxin injections into the masseter may achieve comparable width reduction without surgery, and this should be assessed before bone work is considered
- Patients with Class III malocclusion (underbite) or significant bite problems — these conditions require two-jaw surgery (bimaxillary osteotomy), which repositions both the upper jaw (maxilla) and lower jaw, not V-line surgery; proceeding with V-line in the presence of an uncorrected bite problem may worsen occlusion
- Patients with a lower face width that is proportionate to their upper facial structure — removing bone may create a different disproportion; 3D simulation at consultation is the checkpoint here
Not a suitable candidate
- Patients under 21 years of age in whom facial bone growth may not be complete — premature surgery risks altering ongoing skeletal development
- Patients with active dental disease, unresolved pericoronitis, or recent dental implant placement — infection risk and proximity of dental roots to osteotomy lines makes this a contraindication
- Patients with unrealistic expectations for result visibility timeline — if visible change is expected within 4–6 weeks, this surgery is the wrong choice; the first months show primarily swelling reduction, not final contour
At consultation, the surgeon requires a full-face 3D CT scan, a dental examination confirming no active disease, and standard pre-operative bloodwork and anesthesia clearance. The consultation itself should include a review of the 3D CT imaging with the surgeon present — not delegated to a patient coordinator — so that the proposed osteotomy lines can be explained relative to the inferior alveolar nerve path.
Korea has approximately 2,100 board-certified plastic surgeons registered with the Korean Society of Plastic and Reconstructive Surgeons (KSPRS; 대한성형외과학회, Daehan Seonghyeong Oegwa Haghoe, South Korea’s official professional and certification board for plastic and reconstructive surgeons).² Board certification requires completion of six years of medical school, a four-year plastic surgery residency, and passage of KSPRS board examinations.³ Patients can verify a surgeon’s certification directly on the KSPRS public registry by searching the surgeon’s name.⁴ For a procedure with this technical complexity and nerve-proximity risk, confirming board certification is a baseline step, not optional.
Results and Longevity
Bone that is surgically removed does not regenerate. Osteotomy results from mandibular angle reduction and genioplasty are permanent in the sense that the resected bone does not return. This distinguishes V-line surgery from injectable treatments — the structural change, once healed, is stable.
The timeline to visible result is the most frequently misunderstood aspect of the procedure. The sequence runs as follows: significant swelling immediately post-operatively obscures all contour change for the first 4–6 weeks; progressive swelling reduction from weeks 6–12 begins to reveal the new jaw line; most patients have a meaningful impression of their result by month 3, but residual deep tissue swelling — not always visible to others but felt by the patient — continues to resolve through month 6. Full bone remodelling, including the smoothing of osteotomy edges and complete soft tissue settling, takes 9–12 months. Photographs taken at week 6 are not a reliable basis for assessing whether the result is satisfactory.
Face width reduction of 5–10mm per side is achievable in patients with prominent mandibular angles, combining angle resection with outer cortex shaving. The actual width change visible in the mirror is influenced by soft tissue redistribution over the reduced bone scaffold — skin and subcutaneous tissue drape downward and inward after the underlying bone support changes shape.
Aging continues after surgery. The mandible itself does not revert, but overall facial aging — volume loss, skin laxity, soft tissue descent — proceeds on its normal trajectory. The V-line result does not prevent aging, but the changed bone structure persists as the structural basis of the lower face.
Recovery Timeline
V-line surgery recovery is one of the more demanding outpatient recovery experiences in facial aesthetics. Patients travelling internationally should plan logistics accordingly.
General anesthesia. Operative time approximately 2–3 hours. Overnight hospital stay standard; face compression garment applied. Expect significant swelling and discomfort from hours 4–12 as anesthesia clears.
Peak swelling. Facial width appears larger than pre-surgery due to surgical edema — this is expected and temporary. Liquid diet only. Pain managed with prescribed analgesics. Bruising tracks downward toward the neck.
Suture check and removal (intraoral sutures typically dissolve; external garment continues). Liquid to very soft diet. Most patients are not presentable in public. International patients should remain in Korea through at least day 7–10 for post-operative check.
Swelling visibly reduces week by week. Soft foods introduced. Numbness of chin, lower lip, or lower teeth is common during this window — most cases of inferior alveolar nerve disturbance begin to improve here.
Progressive contour emergence. Near-normal diet by week 4–6; hard or crunchy foods avoided until month 3. Most patients return to office work by week 2–3, though facial swelling remains visible to close contacts.
Deep swelling resolution and bone remodelling. Osteotomy edges smooth. Full result assessable at 12 months. Nerve sensation, if disturbed, typically fully resolves within 3–6 months in the majority of cases.
Gangnam-gu receives approximately 60% of medical tourists seeking aesthetic procedures in Korea,¹ and the infrastructure — pharmacies, soft-food restaurants, compression garment suppliers — is calibrated to post-operative recovery needs. Planning accommodation within 15 minutes of the operating clinic simplifies the first-week follow-up visits.
What is the difference between V-line surgery and two-jaw surgery?
V-line surgery reduces and tapers the lower jaw (mandible) and chin through osteotomies that remove bone, working only on the mandible from below. Two-jaw surgery (bimaxillary osteotomy) repositions both the upper jaw (maxilla) and lower jaw (mandible) to correct occlusal (bite) problems or change the overall facial profile — it is significantly more complex and carries higher risk. They address different problems: V-line is for jaw width reduction; two-jaw is for bite correction and facial profile change.
Will V-line surgery change my bite?
Standard V-line surgery (mandibular angle reduction plus chin work) should not change the bite if the osteotomies are performed correctly below the dental roots and masticatory line. However, any mandibular surgery carries a small risk of bite alteration if bone movement is imprecise. This is why 3D CT planning and a surgeon with documented V-line volume are important — it is a technically demanding procedure where planning determines the outcome.
How much face width reduction is realistic from V-line surgery?
The amount of facial width reduction depends on the prominence of the mandibular angles and the amount of bone that can be safely removed. Most patients achieve 5–10mm of width reduction per side from angle reduction and outer cortex shaving combined. The visual change is also influenced by how much of the face width comes from bone versus soft tissue — patients with significant masseter muscle bulk will see less proportional change from bone work alone.
When can I eat normally after V-line surgery?
Liquid diet is required for the first 1–2 weeks post-operatively. Soft foods (yogurt, mashed vegetables, soft rice) can be reintroduced from week 2–4 as pain and swelling permit. Most patients return to a near-normal diet by week 4–6, though hard, crunchy, or jaw-demanding foods should be avoided for 3 months while bone healing is ongoing. Plan your accommodation and food logistics in Korea accordingly — eating out is limited in the first week.
Sources
¹ KHIDI, Medical Tourism Statistics 2024 — specialty breakdown section. [khidi-2024-stats-top-specialties]
² KSPRS Board Certification Registry — membership statistics, KSPRS annual report 2024. [ksprs-registry-total-certified]
³ KSPRS Board Certification Registry — board certification requirements section. [ksprs-registry-training-requirements]
⁴ KSPRS Board Certification Registry — public registry section. [ksprs-registry-public-verification]