Most people picture straight teeth when they think about orthodontics. But some of the most challenging cases I treat involve something that surprises patients when they first hear about it: an open bite. This is a condition where the upper and lower teeth simply do not come together when the mouth is closed. There is a visible gap, usually in the front, and it can affect everything from speech to the ability to bite into a sandwich.
I have treated open bites in children, teenagers, and adults, and every case teaches me something new about how complex the human bite really is. If you or your child has been told you have an open bite, understanding the condition is the first step toward fixing it.
What Is an Open Bite
An open bite occurs when there is a space between the biting surfaces of the front teeth, the back teeth, or both while the jaw is fully closed. The most common form is an anterior open bite, where the front teeth do not overlap at all. When you smile, the upper and lower front teeth have a noticeable gap between them even though the back teeth are touching.
Some patients also develop a posterior open bite, where the back teeth fail to meet. This is less common but can create serious chewing difficulties. In my experience, most patients I see with open bites have the anterior type, and many of them have lived with it for years before seeking treatment.
What Causes an Open Bite
So what causes an open bite? There are several contributing factors, and they tend to fall into two broad categories: habits and genetics.
Prolonged thumb sucking or pacifier use during childhood is one of the most frequent causes. When a child sucks a thumb or pacifier past the age of four or five, the constant pressure pushes the front teeth forward and prevents them from erupting fully. I had a young patient a few years ago who sucked her thumb until age seven, and by the time she came to see me, her front teeth had a gap you could slide a pencil through.
Tongue thrusting is another significant cause. Some people develop a habit of pushing the tongue against the front teeth when swallowing, speaking, or even at rest. Over time, this repetitive force prevents the teeth from closing properly. It is one of those habits that patients are often completely unaware of until we point it out.
Genetics play a role as well. Some people are simply born with jaw growth patterns that predispose them to open bites. If the upper jaw grows downward and backward more than it should, the front teeth may never fully meet. Skeletal open bites like these are typically more complex to treat than those caused by habits alone.
Temporomandibular joint disorders and certain conditions that affect bone growth can also contribute. In rarer cases, trauma to the jaw during childhood development can alter how the teeth align later in life.
Consequences of Leaving an Open Bite Untreated
An open bite is not just a cosmetic issue, although many patients initially come in because they are self-conscious about their smile. The functional consequences are real and can worsen over time.
Chewing becomes inefficient. When the front teeth cannot meet, biting into foods like apples, corn on the cob, or even a simple piece of bread becomes frustrating. Patients compensate by chewing primarily with their back teeth, which can lead to excessive wear on those molars.
Speech can be affected as well. Certain sounds, particularly "s" and "z" sounds, require the tongue to interact with the front teeth. An open bite can cause a lisp or other speech difficulties that may persist into adulthood if left untreated.
There is also an increased risk of temporomandibular joint problems. When the bite is not balanced, the jaw joints and muscles work harder than they should, which can lead to pain, clicking, and headaches over time.
Can Braces Fix an Open Bite
Yes, braces can fix an open bite, though the approach depends on the cause and severity. In many cases, especially when the open bite is caused by habits rather than skeletal issues, traditional braces are highly effective.
Braces work by applying controlled forces to move teeth into proper alignment. For open bite cases, we often use elastics (rubber bands) that connect the upper and lower arches to help pull the front teeth together. This is one of the situations where patient compliance with wearing elastics really matters. I always tell my patients that the elastics are doing the heavy lifting in open bite correction, and skipping them means slower progress.
For younger patients, we sometimes use habit-breaking appliances like a tongue crib or a palatal bar. These devices discourage tongue thrusting and thumb sucking, giving the teeth a chance to erupt into the correct position naturally.
Clear aligners have also become an option for certain open bite cases, particularly milder ones. However, in my practice, I find that traditional braces with elastics give me more control over the vertical movements needed to close an open bite effectively.
When Surgery Becomes Part of the Plan
For skeletal open bites, where the jaw itself has grown in a way that prevents the teeth from meeting, orthodontics alone may not be enough. In these cases, orthognathic surgery (jaw surgery) combined with braces is often the best path forward.
Surgery repositions the upper jaw, the lower jaw, or both so that the teeth can come together properly. It sounds intimidating, and I understand why patients feel anxious about it. But the results can be truly life-changing, both functionally and aesthetically. I have seen patients go from being unable to bite into food normally to having a completely functional, beautiful smile.
The decision to pursue surgery is never taken lightly. It involves collaboration between the orthodontist and an oral surgeon, careful imaging and planning, and a thorough conversation with the patient about what to expect.
What to Expect During Treatment
Open bite treatment typically takes longer than straightforward crowding cases. For braces alone, treatment may last 18 to 30 months depending on severity. Cases involving surgery will have a longer overall timeline, including a pre-surgical phase of braces, the surgery itself, and a post-surgical finishing phase.
Retention after open bite correction is critical. Because open bites have a higher tendency to relapse than many other orthodontic issues, wearing retainers as directed is essential. I cannot stress this enough. I have seen beautifully corrected open bites start to reopen when patients stop wearing their retainers too soon.
If you suspect you or your child has an open bite, getting an evaluation sooner rather than later is worthwhile. Early intervention, especially in children, can sometimes prevent the problem from becoming more severe and reduce the complexity of treatment down the road. An open bite is absolutely treatable, and the improvements in function, speech, and confidence are well worth the effort.
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