Prognathism is a protrusion of your upper jaw, lower jaw or both. This condition may be inherited, or it could be caused by an underlying health condition. Treatment involves a combination of corrective jaw surgery and orthodontics.
Prognathism is when your jaw protrudes, or juts out. This typically involves your lower jaw. Prognathism is a congenital condition. This means that people are born with it. But while symptoms may be present at birth, they can also emerge later in life due to dental injuries (such as blunt force trauma to your mouth) or childhood habits (like thumb sucking).
There are different types of prognathism, including:
Prognathism can range from mild to severe. Some cases are more noticeable than others and can significantly impact your quality of life.
Prognathism affects both men and women, though it’s slightly more common in men.
Prognathism affects about 0.5% to 2.0% of children and 2.0% to 4.0% of adults.
A protruding jaw can cause malocclusion (where your teeth don’t fit together properly). Malocclusion can cause a number of health issues, including dental wear and tear, chewing difficulties and speech problems.
Misaligned teeth are also more difficult to brush and floss. As a result, many people with prognathism have an increased risk for tooth decay (cavities) and gum disease.
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People with prognathic jaw can develop a wide range of symptoms, depending on the type and severity of their condition. Common prognathism symptoms include:
Simply stated, prognathism happens when your facial bones grow abnormally. There can be several reasons why this happens. In many cases, people simply inherit a larger jaw. In other words, the condition is passed down to children by parents and isn’t linked to any underlying medical conditions. However, in some instances, prognathism may be a symptom of certain conditions or syndromes, such as:
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Your healthcare provider will perform a comprehensive physical examination and ask questions about your symptoms and family history. They may also take:
Prognathism treatment depends on the severity of your condition. Generally speaking, skeletal issues like prognathism require surgery. Some mild cases may be addressed with orthodontics, such as braces. A combination of both surgery and orthodontics is recommended in most instances.
Also called corrective jaw surgery, orthognathic surgery involves repositioning your jaw bones to improve health, function and appearance. Once your orofacial bones are positioned properly, your teeth will fit together better as well.
Orthognathic surgery is usually performed in conjunction with braces or clear aligners. In many cases, you’ll begin treatment with braces and undergo jaw surgery later on, once your teeth are in better alignment. But treatment is different for everyone. Your healthcare provider can tell you what to expect in your unique situation.
In very mild cases, prognathism may be corrected with orthodontics alone, but this isn’t the norm. Braces can move teeth, but they can’t move your facial bones. So, if skeletal abnormalities are moderate or severe, then you’ll likely need surgery as part of your treatment.
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All in all, it takes about nine to 12 months to recover from orthognathic surgery. Your healthcare provider will give you detailed instructions to follow during this time, including dietary guidelines. Though full recovery takes up to one year, you’ll be able to return to work, school and normal routines in about two to three weeks.
As with any surgical procedure, there are risks associated with orthognathic surgery. Possible complications include:
Because prognathism is a congenital condition (present at birth), there’s nothing you can do to prevent it from happening. If you’re planning on having children and you want to know if there’s a chance of passing a genetic condition to them, you can schedule an appointment with a genetic counselor.
If you have prognathic jaw, your healthcare provider will discuss your treatment options with you in detail. Chances are, you’ll need surgery to correct the issue.
If you have a protruding jaw, talk to your healthcare provider. They can help determine if prognathism is simply a cosmetic issue or if it’s interfering with your health and function. If your condition causes serious issues — such as difficulty chewing, speaking or breathing — call your healthcare provider right away.
A note from Cleveland Clinic
Prognathism can have a significant impact on your dental function and overall health. People with prognathic jaws may also feel embarrassed or self-conscious about their appearance. Orthognathic surgery can reduce dental wear and tear, improve your chewing function and enhance your facial features. If you think you might have prognathism, talk to your healthcare provider. They can find a solution to meet your needs.
Last reviewed on 04/28/2022.
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Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy