What Is Oral Maxillofacial Surgery?

Oral and maxillofacial surgery is the surgical specialty devoted to the face, jaws, mouth, and surrounding structures. It is one of the broadest surgical fields in medicine, spanning everything from routine wisdom tooth removal to complex cancer reconstruction involving microsurgical tissue transfer, and from corrective jaw realignment to total replacement of the jaw joint. Because the face houses so many critical functions in such a compact space, the specialty sits at the intersection of dentistry, medicine, and surgery in ways that often surprise people encountering it for the first time.

What the Specialty Actually Covers

If you picture a triangle connecting the scalp, the neck, and the ears, almost everything within that triangle can fall under an oral and maxillofacial surgeon’s scope. That includes the bones of the upper and lower jaw, the temporomandibular joints, the sinuses, the eye sockets, the cheekbones, the teeth, the tongue, and the soft tissues of the face and neck. Conditions treated range from dental infections and impacted teeth to birth defects like cleft palate, facial fractures from car accidents or falls, tumors of the mouth and jaw, obstructive sleep apnea caused by skeletal anatomy, and chronic jaw-joint disease. Training reflects that breadth: in many countries, oral and maxillofacial surgeons complete both dental and medical degrees, followed by years of hospital-based surgical residency.

Corrective Jaw Surgery

Orthognathic surgery, the repositioning of the upper jaw, lower jaw, or both, is one of the specialty’s signature procedures. It addresses jaws that don’t align properly, causing difficulty chewing, breathing, or speaking, along with facial asymmetry. Modern techniques use patient-specific cutting guides and fixation plates designed from three-dimensional scans, and the results are remarkably precise. In a study of 49 patients who had both jaws repositioned using custom guides, the upper jaw landed within about half a millimeter of the planned position on average, and the lower jaw within roughly one millimeter across all three dimensions.

Orthognathic surgery also treats obstructive sleep apnea when the problem stems from a small or set-back jaw. Advancing both jaws forward physically enlarges the airway behind the tongue and palate. A systematic review and meta-analysis found that this procedure increased the space behind the throat by a mean of about 7 cubic centimeters and brought patients’ breathing-interruption scores below the clinical threshold of 20 events per hour on average.² Individual imaging studies show even more dramatic changes: one found about a 2.5-fold increase in total upper-airway volume, with the space behind the palate expanding roughly 3.5-fold.³ For people with severe sleep apnea who can’t tolerate a CPAP machine, jaw advancement can be transformative.

Wisdom Teeth and Dentoalveolar Surgery

The most common reason people encounter this specialty is wisdom tooth removal. Impacted lower wisdom teeth sit close to the inferior alveolar nerve, which supplies sensation to the lower lip and chin, and surgical technique matters for avoiding nerve damage. One approach gaining traction for teeth intimately wrapped around the nerve is coronectomy, where the surgeon removes only the crown of the tooth and leaves the roots in place. A randomized controlled trial found that coronectomy produced less pain and fewer cases of dry socket compared to full extraction, with no difference in infection rates.⁴

Dry socket, or alveolar osteitis, remains one of the most common complications after wisdom tooth removal. There is low-certainty evidence that placing platelet-rich fibrin or platelet-rich plasma in the extraction socket may reduce its incidence, though more research is needed before that becomes routine.⁵

Facial Trauma and Fracture Repair

Broken jaws, shattered cheekbones, fractured eye sockets, and damaged teeth from falls, assaults, sports injuries, and car accidents are staples of the oral and maxillofacial surgery caseload. The goals in facial fracture surgery are restoring normal anatomy, re-establishing a functioning bite, and ensuring long-term stability. Most adult fractures are fixed with small titanium plates and screws, which stay in permanently unless they cause problems. In children, the calculus is different because the growing skeleton can incorporate or distort metal hardware over time. A systematic review comparing resorbable (dissolvable) plates to titanium for pediatric jaw fractures found similar complication rates, around 10 to 14 percent, but titanium hardware was removed electively far more often.⁶ That finding has nudged some surgeons toward resorbable fixation in younger patients when fracture patterns allow it.

Temporomandibular Joint Reconstruction

The temporomandibular joint (TMJ) is one of the most complex joints in the body, and when conservative treatment for chronic TMJ disease fails, surgical options range from minimally invasive arthroscopy to complete joint replacement. Total TMJ replacement is reserved for the most severely damaged joints, including those destroyed by autoimmune arthritis, previous failed surgeries, or ankylosis (fusion of the joint). Custom-made prostheses designed from CT scans of each patient’s anatomy have shown strong results. In a prospective study of 42 patients followed for five to eight years after custom joint replacement, there was significant improvement in mouth opening, jaw function, and pain.⁷

A separate one-year prospective study of 74 patients with TMJ prostheses found that average pain scores dropped dramatically, from about 72 out of 100 before surgery to just 8 afterward, and mouth opening increased from about 22 millimeters to nearly 34. Patients also went from eating mostly soft foods to tolerating a normal diet.⁸ For patients who have been living with a jaw that barely opens and constant pain, those numbers represent a dramatic change in daily life.

Oral Cancer Surgery and Mandibular Reconstruction

When cancer develops in the mouth, surgery is typically the primary treatment. The central challenge is removing enough tissue to clear the tumor while preserving enough anatomy for the person to eat, speak, and look like themselves. Surgical margins, the rim of healthy tissue around the removed cancer, are critical. A national study of oral cancer surgeries found that margins under one millimeter occurred in about 16 percent of cases, with wide variation between hospitals, and that patients with those narrow margins had worse two-year survival.⁹ Deeper analysis suggests that when the deep margin exceeds three millimeters, five-year survival rates resemble those of patients with fully clear margins, while deep margins under three millimeters approach the poor outcomes seen with positive margins.¹⁰

When cancer involves the jawbone and part of the mandible must be removed, reconstruction typically relies on a free fibula flap, a segment of bone and tissue harvested from the lower leg along with its blood supply. Surgeons reconnect the tiny blood vessels under a microscope at the jaw site. The technique, introduced in 1989, has become the gold standard, with flap survival rates reaching about 95 percent and good outcomes for speech and appearance.¹¹ Dental rehabilitation on the reconstructed bone, with implants placed into the transplanted fibula segment, usually follows six to twelve months later.¹²

Cleft Lip and Palate Repair

Cleft lip and palate is among the most common birth defects, and its surgical repair is a years-long process that typically begins in infancy and continues into the teenage years with bone grafting and sometimes corrective jaw surgery. The timing of palate repair has been debated for decades. A large randomized trial published in the New England Journal of Medicine compared repairing the palate at six months versus twelve months of age. At five years, roughly 9 percent of children in the early-repair group had insufficient function of the soft palate (the muscle that closes off the nose during speech) compared with 15 percent in the later-repair group, and complication rates were similar between the two groups.¹³

There is also remarkable variation in how surgeons sequence cleft repairs. A UK-wide study documented 32 surgeons using 10 different surgical sequences for primary repair of unilateral cleft lip and palate, with over a third of surgeons using more than one sequence during the two-year study period.¹⁴ This reflects genuine uncertainty in the field about the ideal approach, and standardizing care has become a growing focus of cleft teams worldwide.

Dental Implants and Bone Grafting

Placing dental implants is a core part of the specialty, particularly in complex cases where the jawbone has deteriorated. An implant’s initial mechanical grip in the bone, often called primary stability, is one of the strongest predictors of whether it will successfully integrate with the surrounding bone over time. Bone quality, bone quantity, implant shape, and the surgical technique all influence that stability.¹⁵

When the back part of the upper jaw has lost too much bone for standard implant placement, a sinus lift procedure can build it back up. This involves lifting the membrane that lines the maxillary sinus and packing bone graft material beneath it. Using a lateral window approach, surgeons can add enough height to bring the bone above nine millimeters, while a less invasive osteotome technique typically adds three to nine millimeters.¹⁶ The grafted bone then heals over several months before implants are placed into it.

Nerve Repair After Facial Injuries

Facial fractures can damage the nerves that provide sensation to the lip, chin, cheek, and tongue. The inferior alveolar nerve, which runs through the lower jaw, is the most commonly injured in facial trauma, followed by the mental nerve and the infraorbital nerve.¹⁷ Numbness from these injuries sometimes resolves on its own, but when it doesn’t, microsurgical nerve repair can help. Timing is everything: a large retrospective review of 222 lingual nerve repairs found that about 90 percent of patients recovered useful sensation or better, but every month that passed before surgery reduced the odds of improvement by nearly 6 percent. Patients who waited more than nine months were at significantly greater risk of poor outcomes.¹⁸

Virtual Surgical Planning and 3D Printing

One of the most significant recent advances in the field is virtual surgical planning (VSP). Surgeons now routinely use CT scan data to plan complex operations on a computer screen before entering the operating room, designing patient-specific cutting guides that are 3D-printed and sterilized for use during surgery. This has improved accuracy in bone reconstruction and reduced the time the transplanted tissue spends without blood flow.¹⁹

A study evaluating 3D-printed guides for mandibular reconstruction found that the planned and actual jaw shapes deviated by only about two millimeters on average for key measurements like the distance between the jaw angles and the front-to-back jaw depth.²⁰ As expected, accuracy decreased slightly with more bone segments and longer bone lengths, but overall the technology brings a level of predictability that was impossible a generation ago. Some centers have moved to in-house planning and printing, cutting out the turnaround time and cost of outsourcing to commercial planning services.²¹

Anesthesia Safety in the Office Setting

Oral and maxillofacial surgeons are unusual among surgical specialists in that they frequently administer their own anesthesia in office-based settings rather than working with a separate anesthesiologist. This is most common for procedures like wisdom tooth removal and implant surgery. A large survey of over 34,000 patients who received anesthesia in oral surgery offices found a complication rate of about 1.3 per 100 cases, and the complications were minor and self-limiting. Only two patients required hospitalization.²²

That said, the margin for error is narrow. An analysis estimated that deaths and brain injuries associated with deep sedation or general anesthesia provided by dentists likely exceed one per month across the United States. Airway problems are the leading contributor to serious complications, and human error plays a major role. The authors emphasized that safe outcomes depend on proper patient selection, appropriate monitoring, and a trained anesthetic team.²³ If you’re having a procedure under deep sedation, it’s reasonable to ask about the team’s training, monitoring equipment, and emergency protocols.

Quality of Life After Major Jaw Surgery

Surgeons have historically measured success by whether the bones healed in the right position and whether the bite was correct. Patients measure success by whether they can eat comfortably, whether their face looks the way they hoped, and whether they feel better about themselves. These two perspectives don’t always align. A recent review observed that technical success often fails to translate into perceived benefit when patients have persistent functional, aesthetic, or psychosocial concerns despite clinical stability.²⁴

For orthognathic surgery specifically, quality of life does improve substantially for most patients, but the timeline matters. A meta-analysis of over 50 studies found large improvements in quality-of-life scores, with facial aesthetics showing the greatest gains. Quality of life typically drops in the first month after surgery, which makes sense given the swelling, restricted diet, and numbness, but it surpasses pre-surgery levels by about six months and continues improving through 12 months before plateauing. People who start with worse quality of life tend to gain the most. Complications like persistent numbness or relapse of the jaw position can dampen the improvement considerably.²⁵

Medication-Related Jaw Problems

Bisphosphonates, widely prescribed for osteoporosis and cancer-related bone loss, can cause a troubling complication called medication-related osteonecrosis of the jaw (MRONJ), where areas of jawbone die and become exposed through the gum tissue. It usually develops after dental extractions or other procedures but can arise spontaneously. When conservative management with antibiotics and mouth rinses fails, surgical resection of the dead bone can be effective. A study of 95 surgically treated sites found that about 92 percent healed acceptably. Patients on oral bisphosphonates had a slightly higher healing rate than those on intravenous forms, and all 29 patients who had upper-jaw resections healed without complications.²⁶

This is worth knowing about if you take bisphosphonates, because preventive dental care before starting these medications can reduce the risk substantially. If you’re already on them and need jaw surgery, your surgeon will factor that into planning.

Artificial Intelligence in Diagnosis

AI is beginning to find practical roles in maxillofacial diagnosis, particularly in reading imaging studies. Deep learning algorithms have shown strong performance in tasks like detecting vertical root fractures on cone-beam CT scans, with diagnostic accuracy around 89 to 93 percent depending on the tooth type and imaging modality.²⁷ AI has also been applied to building prediction models that help identify patients at high risk for developing oral cancer or for disease recurrence after treatment.²⁸ These tools are not replacing surgeons, but they are starting to function as a second set of eyes, particularly useful in screening settings where early detection makes the biggest difference.

When Dental Infections Become Life-Threatening

Most dental infections are manageable, but a small percentage spread into the deep spaces of the neck, and those cases become surgical emergencies. Abscesses in the spaces around and behind the throat can obstruct the airway and, in severe cases, descend into the chest. A study of odontogenic deep neck infections found that abscesses involving the retropharyngeal and parapharyngeal spaces, combined with swelling around the larynx, were key risk factors for dangerous airway complications after surgery. In some of these patients, a tracheostomy was the safest way to maintain the airway during and after surgical drainage.²⁹ These cases are uncommon but represent the most acute end of what oral and maxillofacial surgeons manage, often in the middle of the night in emergency departments.