What Is a Jaw Fracture?
A jaw fracture is a break in the bones of the upper jaw (maxilla) or lower jaw (mandible). The mandible is the more commonly fractured of the two because it sits exposed at the lower face.
Fractures can be simple (a single clean break) or complex (multiple breaks, displaced fragments, or open wounds into the mouth). Common locations on the mandible include the condyle (near the jaw joint), the angle, the body, and the symphysis at the chin.
Jaw fractures often happen alongside dental injuries, soft tissue lacerations, and other facial bone breaks. Because the upper and lower teeth must meet correctly for normal eating and speech, even small displacements can cause big functional problems if left untreated.[5]
Oral and maxillofacial surgeons are the specialists trained to repair these injuries. You can learn more about their training and scope on the oral-surgery page.
Causes and Risk Factors
Jaw fractures almost always result from a direct blow or impact to the face. The cause shapes the fracture pattern and the likelihood of other injuries.
Common Trauma Causes
The leading causes of jaw fractures include physical assaults, motor vehicle collisions, falls, sports injuries, and workplace accidents. Bicycle and motorcycle crashes are also common sources, especially when no helmet or face guard is worn.
- Assaults and interpersonal violence (often the angle or body of the mandible)
- Motor vehicle and motorcycle crashes (often multiple facial bones)
- Falls, especially in older adults
- Sports injuries (contact sports, cycling, skating)
- Workplace and machinery accidents
Medical and Bone-Related Risk Factors
Some patients fracture more easily because of weakened bone. Conditions and medications that affect bone density or healing can raise the risk of fracture from minor trauma. Long-term bisphosphonate therapy, used for osteoporosis and some cancers, has been linked to medication-related osteonecrosis of the jaw and complicates repair when fractures occur.[6]
Older adults are another higher-risk group. Research on mandibular fracture repair has examined whether age alone increases complications. A 2022 study in the Journal of Oral and Maxillofacial Surgery found that older patients can be treated successfully, but they may face higher rates of certain adverse outcomes related to comorbidities.[1]
- Osteoporosis or low bone density
- Long-term bisphosphonate or antiresorptive therapy[6]
- Prior radiation to the jaw
- Uncontrolled diabetes
- Heavy smoking or alcohol use
Symptoms and Diagnosis
Symptoms appear right after the injury and usually include jaw pain, swelling, and a bite that feels off. A clinical exam combined with imaging confirms the diagnosis.
Patients often notice pain that worsens with movement, difficulty opening or closing the mouth, and a visible step-off or asymmetry along the jawline. Numbness in the lower lip or chin can signal injury to the inferior alveolar nerve, which runs through the mandible. Bruising under the tongue is a classic sign of a mandibular fracture.
Diagnosis typically starts with a careful exam of the bite, jaw range of motion, and any loose or displaced teeth. Panoramic X-rays show most mandibular fractures, while CT scans give detailed views of the condyle, midface, and any displaced fragments. When a tooth sits directly in the fracture line, surgeons must decide whether to keep or remove it, a decision that affects healing and infection risk.[3]
Seek emergency care for any suspected jaw fracture, especially with airway compromise, heavy bleeding, vision changes, or signs of head injury.
Treatment Options
Treatment depends on where the jaw is broken, how displaced the pieces are, and whether teeth or nerves are involved. Options range from a soft diet and observation to open surgery with titanium hardware.
Closed Reduction and Maxillomandibular Fixation
Closed reduction means realigning the bones without making an incision. The surgeon then holds the jaws together using wires or elastics anchored to the teeth, a technique called maxillomandibular fixation (MMF). The jaw is typically immobilized for several weeks while bone heals.
When patients lack enough teeth to anchor wires, surgeons may use intermaxillary fixation (IMF) screws placed into the jawbone. A retrospective study found IMF screws are generally safe but carry some risk of root injury and screw loosening, so placement requires careful imaging.[2]
Open Reduction and Internal Fixation (ORIF)
Open reduction with internal fixation (ORIF) is the most common surgical repair for displaced mandibular fractures. The surgeon makes an incision (often inside the mouth), realigns the bone fragments, and secures them with small titanium plates and screws. The hardware usually stays in place permanently.
Condylar fractures, which occur near the jaw joint, may be approached through a small incision behind the jaw. The mini-retromandibular approach has been described as a safe technique that gives direct access to the condyle while protecting the facial nerve.[4]
A randomized study found that patients who began moving their jaw immediately after rigid fixation had similar healing and faster return of function compared with those kept in prolonged fixation.[7]
Non-Surgical Management
Some fractures heal well without surgery. Nondisplaced or minimally displaced fractures, certain pediatric fractures, and some condylar fractures can be managed with a soft or liquid diet, jaw rest, pain control, and close follow-up.
Antibiotics are often prescribed when the fracture extends through the tooth-bearing part of the jaw, since the mouth is not a sterile environment. The treating surgeon weighs displacement, bite alignment, and patient health when choosing this conservative path.
Recovery and Aftercare
Most patients recover functional jaw use within 6 to 8 weeks, though complete bone healing and nerve recovery often take longer. Recovery depends on the fracture pattern, the repair method, and overall health.
During the first 1 to 2 weeks, expect swelling, bruising, and mouth soreness. A liquid or pureed diet is usually required, sometimes for several weeks. Patients in maxillomandibular fixation cannot open their mouths normally and need careful oral hygiene with rinses and a soft brush. Smoking and alcohol slow bone healing and should be avoided.
Follow-up visits track bite alignment, hardware position, and any signs of infection or nonunion. A 2000 analysis of mandibular nonunion identified contributing factors including infection, inadequate fixation, displaced fractures, and patient factors like smoking and noncompliance with diet.[8] Some patients also develop posttraumatic deformities, malocclusion, or limited opening that may need later corrective surgery.[5]
Physical therapy or guided jaw exercises can help restore opening and chewing strength. Numbness in the lip or chin often improves over months as the inferior alveolar nerve recovers, though some patients have lasting changes.
Cost and Insurance Considerations
Jaw fracture repair is usually covered by medical insurance because it is treated as trauma care, not elective dental work. Out-of-pocket costs depend on the repair method, anesthesia, hospital or surgery center fees, and the insurance plan.
Reported total costs for jaw fracture treatment in the United States typically range from about $2,000 to $10,000 or more for simple closed reduction, and $10,000 to $30,000 or more for open surgical repair under general anesthesia. Costs vary by location, provider, and case complexity. Multiple fractures, hospital admission, and additional procedures (such as tooth removal or bone grafting) raise the total.
Most medical health plans cover medically necessary fracture repair, though deductibles and coinsurance still apply. If the injury occurred at work or in a motor vehicle accident, workers' compensation or auto insurance may be the primary payer. Patients without coverage can ask hospitals and surgery centers about charity care, payment plans, or financing programs.[9]
When to See a Specialist
Any suspected jaw fracture should be evaluated by an oral and maxillofacial surgeon or hospital trauma team, not a general dentist alone. Specialists have the training and tools to diagnose, repair, and manage complications.
General dentists play an important role at first contact. They can recognize warning signs (a step in the bite, lower lip numbness, mobile tooth segments) and arrange urgent referral. They also help with later restorative work, such as crowns or implants, after the bone heals.[10]
Choose an oral and maxillofacial surgeon when fractures are displaced, involve the jaw joint, are open into the mouth, or show signs of nerve injury. Older patients, patients on bisphosphonates, and those with previous facial surgery especially benefit from specialist care because their cases tend to be more complex.[1][6]
Find an Oral Surgeon Near You
If you or a loved one has a suspected jaw fracture, get evaluated promptly. Use our directory to find an oral and maxillofacial surgeon near you with experience treating facial trauma, and review their training, credentials, and patient information before your visit. Learn more about the specialty on the oral-surgery page.
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