Broken jaw

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A broken jaw is medically known as a jaw fracture.  

The jawbone is made up of the upper (maxilla) and lower (mandible) jawbone.  A break may occur in either or both of these bones.

Common causes of jaw fracture in children and adolescents

Common causes of jaw fracture in children and adolescents

Various types of impact to the face may cause jaw fractures, such as: 

  • A fall such as from a bicycle or motorcycle
  • Dashboard impact during a car collision
  • A fall or collision during contact sports
  • A punch to the jaw
Common signs and symptoms of a jaw fracture:

Common signs and symptoms of a jaw fracture:

  • Bruising, swelling and tenderness along the jaw or below the ear
  • The feeling that the teeth don’t fit together properly
  • Missing or loose teeth
  • Swelling or black and blue discolouration of the gum over the jawbone, or under the tongue
  • Difficulty opening the mouth
  • Pain in the jaw joint
  • Numbness in the lower lip or chin
  • Shifting of the lower jaw on opening the mouth
Treatment for a jaw fracture:

Treatment for a jaw fracture:

If the fracture is minor, no treatment may be required other than pain medication for discomfort and a soft diet for three weeks to minimize pain while chewing. 

However, if the fracture is moderate to severe, surgical treatment is often required to align and immobilize the bone so that it can heal properly. 

  • Jaw wiring is the usual surgical choice for moderate to severe fractures.  A wire is used to hold the jaw in place and to keep it from moving.  This will help the bones heal properly.
  • Some fractures will require placement of screws and plates in the bone. 

In general, once an uncomplicated jaw fracture is treated, healing usually takes one to two months.

What happens if the teeth are mobile, displaced or fractured?

What happens if the teeth are mobile, displaced or fractured?

If the teeth and/or the surrounding tissue were traumatized, the dentist will be called to assess and treat your child’s teeth.

Can complications occur following a jaw fracture?

Can complications occur following a jaw fracture?

 In most cases, the prognosis is very good, especially when the fracture is treated promptly and properly. If a tooth is in the line of the fracture, however, it may prevent good healing


In rare cases when the fracture is ignored or healing is poor, long-term complications may include:

  • Facial deformity
  • Chronic facial pain
  • Limitation of movement of the jaw joint and malocclusion (abnormality in the coming together of teeth)
How to prevent a jaw injury:

How to prevent a jaw injury:

You can help prevent jaw fractures by avoiding trauma to the chin and lower face.

To do this, you should:

To do this, you should:

  • Always use the proper car seat, booster seat, seat belt and shoulder harness when your child is riding in a car.  It will help protect the facial bones and upper body from impact. Other types of trauma, like traumatic brain injuries, can also be prevented.
  • Your child should always wear well-fitted headgear and a mouth guard during contact sports.  In addition to protecting the teeth from impact, mouth guards offer some protection against jaw fractures. 
  • If your child’s tooth is broken, keep the broken piece and go to an emergency department or to a dentist immediately. The dentist will glue it back in place.  
  • If the tooth is displaced, replace it in its original position.  If this is not possible, place the tooth in cold milk and go to an emergency department or to a dentist immediately.





Reviewed by Trauma specialists at the Montreal Children’s Hospital.
Last updated: July 2013, October 2015

 

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