Genioplasty: Patient Guide
The parent site in this cluster already answers whether to augment the chin and sets out the implant and filler routes. This site answers one narrower question: what changes when the chin bone itself is cut, moved and held in a new position? Three things become possible that nothing placed on the surface of the chin can produce. The chin can be made taller or shorter. The tilt and the midline can be corrected side to side. And the muscle and skin over the chin, which are never lifted off the bone, travel with the segment. The cost of that is a cut in living bone, a nerve that supplies the lower lip, and hardware that stays in the jaw.
Reviewed by Tongchun Mao, MD, head of aesthetic surgery at Chongqing West District Hospital. Numbness of the lower lip and chin is expected after this operation and may not return completely. The bone heals over months, and the settled shape is not readable before that.
It is your own bone, in a different place
A genioplasty is not an implant and not a filler. The surgeon cuts through your own chin bone, frees a segment that stays attached at the back, moves it, and holds it with small plates and screws while it heals. Nothing is added, so the result is a chin of a different shape rather than a chin with something on it. Three capabilities follow from that. The chin can be lengthened or shortened, which nothing placed on the bone can do. Asymmetry can be corrected in three dimensions, because the segment can be moved differently on each side and rotated. The covering soft tissue moves with the segment, because it is never lifted off, so the contour stays continuous. The price is the same fact stated the other way. The change is fixed once the bone heals, and reversing it means cutting again. The nerve that supplies feeling to the lower lip and chin runs close to the cut, and some numbness is expected, usually improving over months and sometimes leaving an area reduced for good. The result is judged at months, not weeks.
What a cut in the bone reaches, and what it does not
The operation is defined by the segment it moves. Everything below is about what follows from moving the patient's own bone rather than placing material against it, because that difference decides both the possibilities and the risks.
The chin can be made taller or shorter
Taking the segment downward lengthens the lower third of the face; taking it upward shortens it. This is the capability that separates bone surgery from anything placed on the bone, because material can only add. Where the complaint is that the lower face reads as short, or that a chin still looks long after projection has been added, the vertical dimension is the question being asked.
The midline and the tilt can be corrected
A segment can be shifted to one side, tilted so that one half sits lower, and rotated so that one side projects more than the other. These are three different corrections that can look identical in a photograph. A device sitting on the surface of the chin cannot lower one side relative to the other, which is why asymmetry of this kind is a bone question.
The soft tissue comes with the segment
The chin pad, the muscle that draws the lower lip down, and the skin over them are not lifted off the bone. They keep their attachment and their blood supply, and they move when the segment moves. The result is a continuous contour rather than a visible edge, and the lower lip often rests slightly differently afterwards because the muscles that hold it attach to the front of the chin.
The bite is not changed by the chin alone
Moving the chin segment does not move the teeth or the jaws that carry them. Where the teeth meet unevenly, or where the jaws themselves are out of position, a genioplasty adjusts the chin in front of a bite that stays as it was. Where the bite is part of the complaint, the plan has to include orthodontics or jaw surgery, and the chin becomes one step inside that plan rather than the whole of it.
A cut in bone rather than a placed material
There is no implant to remove and no material that can be dissolved. Once the bone has healed into its new position, taking the plates out does not put the chin back where it was. A second operation is the only way to reverse or adjust the position, and it is a smaller correction carrying a higher chance of lasting numbness.
A nerve that has to be worked around
The mental nerve leaves the jaw through an opening on its outer surface, close to where the cut is made. It is not usually divided, but it is handled and stretched, and the feeling it carries to the lower lip and chin is disturbed as a result. This is the characteristic trade of the operation rather than an unusual complication, and it is discussed before the decision rather than after it.
Whether the bone is the right target
The useful self-check is not whether the chin looks small but which direction it is wrong in. Sit in front of a mirror in profile and look at three things separately. The distance from the lower lip down to the base of the chin tells you about vertical height; a lower third that reads as short or as long points at the bone rather than at a device. The midline of the chin against the midline of the face, and the height of one side against the other, tell you about asymmetry, which a surface implant cannot correct. The crease between the lower lip and the chin tells you whether the fold is shallow or deep, because that is the feature that decides whether a result reads as natural. Then ask whether the bite is part of the problem: if the teeth meet unevenly, or if you have been told that your jaws do not line up, the plan starts there rather than at the chin. The disqualifiers worth naming are an active infection anywhere in the mouth or jaw, a bite that is being treated and is not yet stable, a chin that has already been operated on and has not finished healing, and a complaint that is really about the nose, the neck or the jawline above the chin, none of which this operation reaches. Being declined is not a judgement about your appearance. It means the target you named is not the one the bone would change.
The plan is a direction and a magnitude
This site does not compare named operations, because the names describe the approach rather than the result. What decides the outcome is where the cut is made, which direction the segment is taken, how far it goes, and how the covering soft tissue is expected to respond. Those four things can be explained in words a patient can check.
Where the cut sits
The cut runs below the roots of the lower front teeth and through the full thickness of the bone, leaving a bridge at the back that keeps the segment attached. Its height is a compromise between leaving enough bone beneath the roots and leaving enough above the base of the jaw for the segment to be stable.
Which direction the segment goes
Forward, backward, downward, upward, sideways, or a rotation, and usually a combination of two. Forward movement changes projection in profile; downward movement changes the height of the lower face; rotation changes the tilt of the lower lip. These produce different faces from the same operation, so the direction belongs in the conversation.
How far it goes
Magnitude is where judgement matters most, because the soft tissue follows the bone less completely as the movement gets larger. Beyond a point the chin can look tight and the fold above it can deepen. Planning less movement than the maximum available is the usual way to keep a result looking like a face rather than like a correction.
How the soft tissue is expected to respond
A thick chin pad absorbs movement and gives a softer change; a thin one transmits it more directly. The same movement therefore produces different results in two people, and a plan built from a fixed idea of how far a chin should move ignores the tissue it has to move through.
Whether the bite is inside the plan
Where orthodontics or jaw surgery is involved, the chin is adjusted after the jaws are set, because its correct position depends on where they end up. Where no jaw surgery is involved, the bite is still examined, because a chin that sits off centre may be sitting there to let the teeth meet.
What cannot be planned in advance
How much sensation returns, how the fold settles, and how much the soft tissue follows the segment are not predictable from an image. A patient who knows that judges the result fairly a year later. One who expects the plan on paper to be the face in the mirror is measuring against something nobody promised.
Days of swelling, months of numbness
The first two days are the worst of it. The chin and lower lip swell, cold compresses and sleeping with the head raised help, and the lip feels numb from the outset. Swelling begins to ease from the third day, and bruising often appears on the neck rather than on the chin itself, which surprises people. Sutures inside the mouth are usually removed within the first week or two. Eating is soft and cool for the first weeks, and chewing on the front teeth is avoided while the bone is soft at the join. Most visible swelling has gone by the second or third week, and desk work is usually possible within one to two weeks, with heavier activity deferred for longer because straining raises the pressure in the healing bone. Numbness of the lower lip and chin is present from the beginning and is the slowest thing to change; it improves over months, often in patches, and part of the lip or chin can stay reduced. The shape continues to change with swelling for several months, and the bone hardens over the first two to three. A result is judged from about three months, and more fairly at a year, by which point the soft tissue has settled and the sensation has done most of what it is going to do.
What can go wrong, and the one risk that belongs to this operation
Swelling, bruising, tightness, a numb lip and a chin that feels unlike your own are expected rather than complications. Beyond them: a collection of blood under the soft tissue, which is uncommon and usually appears in the first days and may need draining; infection, which can settle around the plates weeks or months later and usually means the hardware is removed as part of treating it; a healing problem or exposure of a plate through the gum inside the mouth; damage to the roots of the lower front teeth, which is uncommon and is the reason the cut is planned against the root positions; and a result that is not the one intended, whether because the bone settled differently or because the soft tissue did not follow it. The risk that belongs to this operation in particular is the mental nerve. Feeling in the lower lip and chin is disturbed in most patients, improves over months in most of them, and can remain reduced in part of the lip or chin indefinitely. A second operation in the same area carries a higher chance of that being lasting. None of this is a reason to avoid the operation if the bone is genuinely the target; all of it is a reason to have the decision made by someone who will say so plainly before the cut rather than after it.
What else could answer the same complaint
If the chin is only mildly short of projection and the height of the lower face is right, an implant or a filler reaches the same profile change without a cut in bone, without numbness of the lip, and with a recovery measured in days. Neither can lengthen or shorten the chin, and neither can lower one side of it relative to the other, so they do not answer a vertical or an asymmetric complaint. If the chin is not the problem at all and the profile is being read against the nose, the honest alternative is to leave the chin alone. If the bite is the problem, orthodontics alone or orthodontics with jaw surgery changes the relationship the chin sits in, and a genioplasty in front of an uncorrected bite treats the symptom. If the complaint is fullness under the chin or a soft jawline, that is a different tissue and a different set of options. And if the assessment says the bone is fine, doing nothing is a legitimate answer, because an operation on bone that is already in the right place carries the same nerve risk and produces no gain.
The surgeon responsible for these guides
This site is medically reviewed by Tongchun Mao, MD, Deputy Director of the Plastic Surgery & Aesthetics Medical Center and head of its aesthetic surgery service at Chongqing West District Hospital. He operates inside a tertiary general hospital, with anaesthesia, imaging, laboratory workup and intensive care in the same building as the operating theatre, which matters for the complications that decide a chin result: bleeding under the soft tissue, an infection around the plates, and any problem with the nerve or the tooth roots near the cut. He is supported by Dr. Shaoliang Wang on complex and previously operated cases, and by Dr. Ke He and Dr. Yongbo Jia on the assessment of the skin and soft tissue that have to heal over the segment. Read the full team profiles.
Where this decision sits in the cluster
If you have not yet settled whether to augment the chin at all, start with the overview of chin augmentation as a decision, which answers that question and is not repeated here. If you are weighing a cut in the bone against a device placed on it, the comparison of the two operations sets them side by side. If the profile is what bothers you and the chin is only part of it, the guide to a recessed chin works out which tissue is responsible. If the complaint runs along the jaw rather than at the chin point, the explanation of a weak jawline separates bone, fat and skin. The practice page of the surgeon who reviews this site describes how the assessment is conducted, and the medical centre hub is the place to start for the anatomy behind all of it.
Genioplasty Recovery: Swelling, Numbness and Bone Healing
What happens, and roughly when, from the day of operation to the point at which the result of a genioplasty can honestly be judged. Individual healing varies, and your own team's instructions take precedence over any general timeline.
The decision, in twelve parts
Each guide takes one question a patient actually faces about a cut in the chin bone: which direction the segment moves, what happens to the crease under the lip, how the nerve is monitored, why the plates stay, and where the honest answer is that the bone is not the target. Read the two or three that match where you are.
What a Genioplasty Is: Cutting and Refixing Your Own Chin Bone
Your own chin bone is cut, freed as a segment, moved and fixed in a new position. What follows from operating on bone rather than adding material to the chin.
Read the guide →The Cut in the Bone: How a Sliding Genioplasty Changes the Chin
The result is decided by where the cut sits, which direction the segment is taken and how far it travels, and none of those is settled by the name of the operation.
Read the guide →Lengthening and Shortening a Chin: The Change a Device Cannot Make
Vertical change is what separates bone surgery from anything placed on the bone: how a lower face is made taller or shorter, and what that does to the chin.
Read the guide →An Off-Centre Chin: Correcting Asymmetry by Moving Bone
Shift, tilt and rotation look the same in a photograph and are corrected differently. How a segment is positioned side to side, and why symmetry is not the aim.
Read the guide →The Chin Pad Follows the Bone: How the Soft Tissue Responds
The muscle and skin over the chin are never lifted off the bone, so they move with the segment. Why the same movement produces a different surface in two people.
Read the guide →The Mental Nerve: Numbness of the Lower Lip and Chin After Genioplasty
What the nerve that supplies the lower lip does when the jaw is cut, what the numbness actually feels like, how it is monitored, and how much of it returns.
Read the guide →Settle the direction of the cut before the operation
Arrange an assessment. Imaging of your jaw, the path of the nerve and the way your teeth meet decide whether the bone is the right target, and what a cut could and could not change for you.
Frequently asked questions
What is actually cut during a genioplasty?
A segment of your own chin bone, below the roots of the lower front teeth, freed across the front of the jaw but left attached at the back. It is moved into a new position and held there with small plates and screws. The soft tissue over the chin is never lifted off, so the chin pad and the muscle that moves the lower lip travel with the bone, and the contour stays continuous rather than showing an edge.
Can a cut in the bone make a chin shorter as well as longer?
Yes, and that is the point of it. Taking the segment downward lengthens the lower third of the face; taking it upward shortens it. Nothing placed on the surface of the chin can reduce the distance from the lower lip to the base of the chin, because adding material can only increase it. How far the segment can travel is limited by the bone left beneath the tooth roots and by the path of the nerve through the jaw.
Why does the lower lip go numb after this operation, and does it come back?
The mental nerve leaves the jaw through an opening on its outer surface close to where the cut is made. It is usually not divided, but it is handled and stretched, and the feeling it carries is disturbed as a result. Sensation improves slowly over months, often in patches, with the area over the chin point usually last. Part of the lip or chin can stay reduced for good, and a second operation in the same area makes that more likely.
Do the plates and screws stay in the jaw afterwards?
In most patients they stay for good, and most people cannot feel them. Their job is to hold the two pieces of bone together while the join heals, not to shape the chin, and once the bone is solid that job is finished. Removal is considered when a plate can be felt and is uncomfortable, when an infection settles around the hardware, or when a plate becomes exposed through the gum inside the mouth.
Does the crease under my lower lip change when the chin moves?
It usually does, and it matters more than the position of the chin point. Moving the segment forward tends to flatten the crease; moving it downward tends to deepen it or carry it upward relative to the chin. Where the crease is already shallow, a large forward movement can leave the chin looking undefined. This is why a plan is designed against the fold as well as against the profile line.
Can a chin that has already been operated on be cut again?
It can, and it is a different operation. The healed bone is denser, the previous cut line has to be crossed again, the old plates are removed, and the soft tissue has already been stretched once so it follows the bone less completely. The nerve has also been disturbed before, which makes lasting numbness more likely. Revision is normally planned as a smaller correction than the first operation, and only after the bone and the swelling have settled.
Part of Chin and Jawline — 14 sites on this topic