In short. Bone reduction changes width and border. It does not lengthen a short face, correct a bite, or change what the soft tissue does over the new contour.
Key points
- Width is how far apart the two angles sit.
- Direction is where the chin projects.
- Height is the vertical distance of the lower face.
Most of what determines whether a patient is satisfied is not what the operation does but what it does not do, and this operation does not do several things that patients frequently expect of it. Naming them before the operation is cheaper than discovering them after it.
It does not change the length of the face
Narrowing the lower face does not make it longer or shorter. The height of the lower face is determined by the vertical dimension of the mandible and by the position of the teeth, and a reduction of the angle changes width rather than height. A patient whose complaint is that her face reads short or long is describing a different measurement, and the answer lies with a different assessment rather than with contouring.
Separation, direction, height: three different questions
Width is how far apart the two angles sit. Direction is where the chin projects. Height is the vertical distance of the lower face. The operation on the jaw angle changes the first of those, and only the first. A patient who can say which of the three she would change has narrowed the conversation to one that a consultation can actually resolve.
It does not change the bite
The operation works on the outer surface of the mandible, and the teeth and their relationship are a separate matter. This is why the bite is assessed before the plan is made and why orthodontic treatment is expected to be complete rather than in progress. Where a bite problem exists, it belongs with the clinicians who manage bites, and it is settled before any contouring rather than alongside it.
It does not change the soft tissue
The skin, the fat and the muscles over the jaw do not automatically redrape to a new skeletal contour. In a face with thin soft tissue and reasonable elasticity they usually follow the bone closely, and the change reads as planned. Where the soft tissue is heavier, or has descended with age or weight change, the same change in the bone may read much less. And none of it changes the neck, which contributes as much to the outline of the lower face as the jaw does.
What patients most often expect and do not get
- A longer or shorter lower face, which the operation does not alter.
- A sharper jawline where the soft tissue over the bone is heavy or has descended.
- A change in the neck or in the profile, which are separate structures and separate questions.
The operation is precise about what it changes and silent about the rest. A patient who knows where the boundary falls will judge the result fairly; one who expects the lower face to change as a whole will find the result smaller than she imagined, however well it was performed.
Frequently asked questions
Can contouring make my face look longer?
No. The operation changes the width of the lower face and the outline of the border between the angle and the chin. The height of the lower face is not altered by narrowing it, and a face that reads short does so for reasons the operation does not address. Where length is the complaint, the assessment belongs with a different set of questions entirely.
Will it change my bite?
It is not intended to and it should not. The operation works on the outer part of the mandible, and the teeth and the bite are a separate matter that is assessed before the plan is made. Where a bite problem exists or is being treated orthodontically, that is settled first, because operating on the mandible while the bite is changing complicates both.
Can it change my jawline if the problem is my neck?
Not in the way you would want. The border between the jaw and the neck reads as it does because of both structures, and the neck is not affected by contouring the mandible. Where the soft tissue of the neck has descended, the outline stays soft however the bone beneath it is changed.
Risks & Limitations
- Removing bone is easier than restoring it. Over-reduction is difficult and sometimes impossible to correct, so the amount removed is decided from imaging and treated as fixed.
- The marginal mandibular nerve, which moves the lower lip, runs through the operative field. Weakness after surgery is usually temporary and usually resolves over weeks to months; a lasting weakness is uncommon but possible.
- Swelling hides the result for months. The face reads unevenly at two weeks, is not close to final until around six months, and is judged honestly at around a year.
- Numbness of the chin and the lower lip is expected, is watched rather than treated in the early weeks, and may not return fully in some areas.
- The two sides of a jaw are rarely identical, and reducing both by the same amount can make a pre-existing difference more visible.
- The operation changes width and the border between the jaw angle and the chin. It does not lengthen the face, correct a bite, or change the soft tissue over the new contour.
When to Seek Care
- Swelling that is increasing rather than settling after the first week, or that is much greater on one side — contact the team.
- A wound that is opening, or discharge, spreading redness or warmth around an incision.
- A weakness of the lower lip that is worsening rather than improving, or difficulty breathing or swallowing &mdash — seek emergency care at once.
- Fever, or feeling generally very unwell with a wound or a swollen area.
- Calf pain, swelling or tenderness in one leg, or shortness of breath or chest pain &mdash — seek emergency care at once.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) - facial bone contouring and patient safety guidance
- National Institute for Health and Care Excellence (NICE, UK) - guidance on facial surgery and on venous thromboembolism prevention
- Cochrane Library - systematic reviews in oral and maxillofacial surgery
- British Association of Plastic, Reconstructive and Aesthetic Surgeons (BAPRAS) - patient information on facial surgery
- Chinese Medical Association Plastic Surgery Branch - clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.