In short. Jaw contouring is a bone operation that narrows a lower face which is wide for a skeletal reason, and candidacy depends on bone thickness, the course of the marginal mandibular nerve, a stable bite and reliable healing. Age, tissue cover and motive decide the rest. Being told to wait is the assessment working.
Key points
- Candidacy depends on bone thickness, the nerve course, a stable bite and healing.
- Bone thickness is established from imaging, not from the examination.
- Smoking, uncontrolled blood pressure or impaired healing argue against operating now.
- A clenching or grinding habit loads the masseter and can change the plan.
- Being told to wait, or that the width is not skeletal, is the assessment working.
What are the physical requirements?
The physical requirements for jaw contouring are specific and they are established before any plan is made. Beyond them, the considerations that decide whether the operation is a good idea are about age, healing and motive rather than about anatomy.
The bone has to be thick enough along the planned line to remove safely. The course of the marginal mandibular nerve has to be identified, because the plan is built around it. The teeth and the bite have to be stable. And the blood supply to the bone and the soft tissue has to be reasonable, which means no smoking, controlled blood pressure, and no condition that impairs healing.
What the imaging has to establish
Bone thickness is established from imaging rather than from the examination. The course of the marginal mandibular nerve has to be identified for the same assessment, because the plan is built around it. Both are settled before any plan is made.
Why the teeth and the bite have to be stable
The teeth and the bite have to be stable, which usually means orthodontic treatment is complete or is not planned. A bite that is still moving, or one that is about to be changed, is not a stable base for an operation on the bone that carries it. This is why the assessment asks about orthodontic history as well as about the width of the jaw.
Bone maturity and the tissue over the jaw
The bone has to be mature, which excludes patients who are still growing. The soft tissue has to be able to follow the new contour, which is not a question of age directly but of how much elasticity and how much volume sit over the jaw. In a younger face with thin soft tissue the change in the bone usually reads clearly. In a heavier face, or one where the tissue has descended, the same change may read much less, and that is worth stating before the operation rather than after it.
Does clenching or grinding change the plan?
It is worth mentioning at an assessment whether you clench or grind your teeth, and whether anyone has commented on it. A heavy habit loads the masseter, which is one of the three layers that can produce a wide lower face, and it also means the muscle may redevelop after a treatment aimed at it. That single question changes the plan in a way that no measurement of the bone will.
What motive has to do with candidacy
Motive is the consideration that decides most cases. A patient narrowing a jaw because somebody told her it was wide, or because she wants a particular face from a photograph, is asking an operation to do something it cannot. A patient who has noticed the width herself, over time, and who can describe what she would like changed, is describing a complaint the operation may be able to address. The assessment is where that difference is established, and a plan that skips it is a plan built on the wrong question.
| Requirement | How it is established | What fails it | Why it matters |
|---|---|---|---|
| Bone thickness along the planned line | From imaging, not from the examination | Bone too thin to remove safely | It decides whether the line can be reduced |
| Course of the marginal mandibular nerve | Identified before any plan is made | A plan that does not account for it | The plan is built around the nerve |
| Teeth and bite | Confirming orthodontic treatment is complete or not planned | Orthodontic work still planned or in progress | A moving bite is not a stable base |
| Blood supply and healing | Smoking history, blood pressure, general health | Smoking, uncontrolled blood pressure, impaired healing | The bone and the soft tissue have to heal |
| Bone maturity | Whether growth is complete | A patient who is still growing | The bone has to be mature |
| Soft tissue over the jaw | Elasticity and volume over the jaw | A heavier or descended face | The same bony change may read much less |
| Motive | The assessment conversation | A complaint that came from being told | The operation may answer the wrong question |
When should the operation wait?
Bone that is not yet mature, or orthodontic treatment that is still planned or in progress, argues against operating now. So does smoking that has not stopped, because it impairs the healing this operation depends on. So does a complaint that comes from being told about the width rather than from noticing it.
Being told to wait, or being told that the width is not skeletal, is the assessment working rather than the assessment refusing. This operation narrows a lower face that is wide for a skeletal reason, and it is worth having only where that is the finding and the complaint.
Sources
- American Society of Plastic Surgeons: facial bone contouring and patient safety guidance
- British Association of Plastic, Reconstructive and Aesthetic Surgeons: patient information on facial surgery
- National Institute for Health and Care Excellence: guidance on facial surgery
Internal links
Frequently asked questions
Is there an age limit for jaw contouring?
The bone has to be mature and the soft tissue has to be able to follow the new contour, which in practice excludes patients who are still growing. At the other end, the consideration is not age itself but the state of the soft tissue: where it is heavy or has lost elasticity, the change in the bone may read less clearly than the plan suggests.
Does smoking matter?
Yes, and more here than in many operations. Smoking impairs the blood supply, and this operation depends on bone and on the soft tissue over it healing predictably. Smoking is a reason to postpone rather than a reason to refuse permanently, and stopping has to happen far enough in advance to be meaningful.
Can I have contouring if I have had orthodontic treatment?
Usually yes, and the relevant question is whether the orthodontic treatment is finished or still planned. The bite needs to be stable and not in the middle of being changed, because an operation on the mandible during orthodontic treatment complicates both. It is a question for the assessment rather than a general rule.
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.