Quick answer
An open bite is usually caused by childhood habits like thumb sucking and tongue thrusting, or by inherited jaw growth patterns. Identifying the cause helps guide the right correction.
Key takeaways
- Open bites form when the upper and lower front or back teeth do not meet when the jaws close.
- The two main causes are long-term oral habits and inherited jaw growth patterns.
- Anterior open bites affect the front teeth, while posterior open bites affect the back teeth.
- Early habit correction in children can prevent an open bite from worsening.
- Adults can often correct an open bite with clear aligners, and severe cases may need surgery.
What Causes an Open Bite? The Quick Answer
An open bite is most often caused by long-term oral habits during childhood or by inherited jaw growth patterns. In simple terms, the top and bottom teeth fail to touch when you close your mouth, leaving a visible gap. At Preston Dental Loft, Dr. Meenal Patel sees two main groups of causes: habits that push teeth out of position over time, and genetic factors that shape how the jaws grow.
Open bite defined: when front (or back) teeth don't meet
An open bite means that when you bite down, certain teeth do not make contact. Most people notice it in the front, where the upper and lower teeth leave a gap even while the back teeth touch. It can also happen in the back, where the side teeth do not meet.
The two main drivers: habits and genetics
Habits like thumb sucking and tongue thrusting apply constant pressure that reshapes the growing mouth. Genetics influences how the upper and lower jaws grow and align. Many patients have a mix of both, which is why a careful evaluation matters.
Why identifying the cause matters for treatment
The cause guides the fix. A habit-driven open bite often responds to habit correction and tooth movement, while a jaw-based open bite may need a different plan. Pinpointing the root helps Dr. Meenal Patel design a treatment that lasts.
What Is an Open Bite?
An open bite is a bite problem where some upper and lower teeth do not meet when the mouth is closed. It is one of several common bite issues, and it can appear in the front or the back of the mouth.
Anterior vs. posterior open bite
- Anterior open bite: The front teeth do not touch while the back teeth do. This is the most common and most visible type.
- Posterior open bite: The back teeth do not meet while the front teeth touch. This is less common and often harder to notice.
How an open bite differs from other bite problems
Unlike an overbite, where the top teeth cover too much of the bottom teeth, or an underbite, where the lower teeth sit ahead of the upper teeth, an open bite leaves an actual gap between the biting surfaces. The American Association of Orthodontists explains several common bite problems and how each one affects function, and you can read more in their helpful overview of seven common bite problems and their solutions, which describes how open bites differ from crowding, spacing, and other alignment concerns.
How common is an open bite?
An open bite is one of the less frequent bite problems, but it is far from rare. Research into anterior open bites notes that it is a recognized condition studied for both its habit-related and genetic causes. You can review the detailed clinical and genetic discussion in this study on anterior open bite treatment and its genetic basis, which explores why some people are more prone to the condition than others.
Habit-Related Causes of an Open Bite
Habit-related causes are the most common reason children and teens develop an open bite. Repeated pressure on the teeth and jaw over months and years slowly pushes teeth into an open position.
Prolonged thumb and finger sucking in childhood
Thumb and finger sucking is one of the leading habit causes. When the habit continues past the toddler years, the thumb acts like a wedge that keeps the front teeth apart and can reshape the roof of the mouth. The longer and more forceful the habit, the greater the effect.
Tongue thrusting and improper swallowing patterns
Tongue thrusting happens when the tongue pushes forward against or between the front teeth during swallowing and rest. Because a person swallows hundreds of times a day, this gentle but constant pressure can hold the front teeth apart and maintain an open bite even after other habits stop.
Extended pacifier or bottle use
Pacifier and bottle use works much like thumb sucking. When it continues well beyond infancy, the steady pressure can interfere with normal tooth and jaw development and encourage an open bite to form.
Mouth breathing and airway issues
Chronic mouth breathing, often linked to allergies, enlarged tonsils, or nasal congestion, changes the natural resting position of the tongue and jaw. Over time, this altered posture can contribute to an open bite, which is why Dr. Meenal Patel looks at breathing patterns during an evaluation.
Genetic and Skeletal Causes of an Open Bite
Genetics and jaw structure are the other major causes of an open bite. When the shape and growth pattern of the jaws are inherited, an open bite can develop even without any habit.
How jaw growth patterns are inherited
The size, shape, and growth direction of the upper and lower jaws are strongly influenced by family genetics. If parents have a long-face growth pattern or a jaw shape that opens the bite, their children may inherit the same tendency.
What research says about the genetic basis of open bite
Studies confirm that genetics plays a real role in open bites, especially in the front teeth. The research linked above examined both human and laboratory data to trace the inherited factors behind anterior open bites, supporting the everyday observation that this condition can run in families.
Skeletal vs. dental open bite
- Dental open bite: The jaws are positioned normally, but the teeth themselves are tilted or held apart, often by a habit. These usually respond well to tooth movement.
- Skeletal open bite: The jaw bones themselves grow in a way that keeps the teeth from meeting. These cases can be more complex and sometimes require additional treatment.
How an Open Bite Affects Daily Life
An open bite can affect chewing, speech, and long-term oral health. The impact ranges from mild annoyance to real functional difficulty depending on the size of the gap.
Chewing and biting difficulties
When the front teeth do not meet, biting into foods like sandwiches, apples, or pizza becomes awkward. Many people compensate by using their back teeth more, which can lead to uneven wear over time.
Speech challenges
An open bite can affect certain sounds, especially "s," "th," and "f" sounds, since the tongue and teeth work together to shape speech. Some patients develop a lisp that improves once the bite is corrected.
Long-term wear and oral health effects
Because the biting force is not shared evenly, the back teeth often carry more load. This can lead to accelerated wear, jaw fatigue, and added stress on certain teeth. Correcting the bite helps distribute pressure more evenly and protects your teeth for the long term.
| Area affected | Common effect |
|---|---|
| Chewing | Trouble biting front foods, extra strain on back teeth |
| Speech | Lisp or trouble with "s" and "th" sounds |
| Oral health | Uneven wear and added stress on back teeth |
Is It Possible to Fix an Open Bite?
Yes, an open bite can be corrected, and the right approach depends on age and cause. Children, teens, and adults all have effective options today.
Early intervention and habit correction in children
In children, the first step is often stopping the habit that caused the open bite. When a habit is addressed early while the jaws are still growing, the bite can sometimes improve on its own or with gentle guidance, avoiding more involved treatment later.
Clear aligner and orthodontic treatment for adults
For teens and adults, clear aligners are a popular and discreet way to close an open bite by moving teeth into better contact. As a Diamond Invisalign Provider since 2024, Preston Dental Loft has deep experience guiding patients through Invisalign treatment. Dr. Meenal Patel evaluates each case to confirm whether aligners alone can achieve a stable, lasting result.
Evaluation
Dr. Meenal Patel examines your bite, teeth, and jaw and reviews any habits or breathing concerns.
Custom plan
You receive a plan matched to your open bite type, whether it is habit-related or jaw-based.
Active treatment
Clear aligners or other tools gradually move the teeth into contact for a balanced bite.
Retention
A retainer holds the corrected bite in place to protect your results long-term.
When surgery may be recommended
Surgery is generally reserved for severe skeletal open bites where the jaw structure itself needs to be repositioned. Most patients do not need it, but for significant jaw-based cases it can deliver a stable, functional result when combined with tooth alignment.
Long-term stability of open bite correction
Keeping an open bite closed is just as important as fixing it. Research on non-surgical open bite correction found that results can remain stable over the long term with proper treatment and retention. You can explore the findings in this study on the long-term effectiveness of non-surgical open bite treatment, which followed patients over time to measure how well corrections held. Wearing your retainer as directed is the key to lasting results.
When to See a Dentist in Cary, NC
You should see a dentist if your front or back teeth do not meet, if biting feels difficult, or if you notice speech changes. Early evaluation gives you the widest range of options.
Signs your open bite needs professional evaluation
- A visible gap between your top and bottom teeth when you bite down
- Difficulty biting into foods with your front teeth
- A lisp or trouble with certain sounds
- Uneven wear or jaw fatigue from chewing
- A childhood thumb, finger, or pacifier habit that has continued
What to expect during a consultation
At Preston Dental Loft, your consultation begins with a thorough look at your bite, teeth, jaw, and habits. Dr. Meenal Patel explains what is causing your open bite and reviews the options that fit your goals and lifestyle. You leave with a clear understanding of your next steps. To schedule an evaluation, call Preston Dental Loft at (919) 467-6111.
Find Us
For directions, use this helpful Google Maps link or get step-by-step navigation via Get Directions. Preston Dental Loft also provides Invisalign treatment.
Meet Dr. Meenal Patel
Dr. Meenal Patel is an accomplished general and cosmetic dentist and the owner of Preston Dental Loft in Cary, North Carolina. Known for her warm, patient-centered approach and passion for creating confident smiles, she is committed to providing personalized dental care and an exceptional experience for every patient.
Dr. Patel graduated magna cum laude with a Bachelor of Science in Nutritional Sciences from the University of Florida before earning her Doctor of Dental Medicine (DMD) from the University of Florida College of Dentistry. She further advanced her clinical training through an Advanced Education in General Dentistry (AEGD) residency at the University of North Carolina at Chapel Hill.
Her advanced training encompasses cosmetic dentistry, orthodontics, endodontics, prosthodontics, and dental implantology. She also holds additional certifications in Invisalign and Six Month Smiles treatment. Her dedication to continuing education and clinical excellence has earned her prestigious fellowship credentials from both the Academy of General Dentistry (FAGD) and the International Congress of Oral Implantologists (FICOI). She also serves as an adjunct faculty member in the AEGD residency program at UNC Chapel Hill.
Dr. Patel has extensive experience with clear aligner therapy, contributing to Preston Dental Loft's recognition as a Diamond Invisalign Provider since 2024. Beyond dentistry, she enjoys spending time with family and friends, traveling, visiting the beach and mountains, practicing yoga, and staying active with Peloton.
Frequently asked questions
Some people develop an open bite from long-term habits like thumb sucking, tongue thrusting, or extended pacifier use, while others inherit jaw growth patterns that keep the teeth from meeting. Many patients have a combination of both. Dr. Meenal Patel at Preston Dental Loft evaluates each case to find the exact cause.
An open bite is one of the less common bite problems, but it is still seen regularly. Anterior open bites affecting the front teeth are the most frequent type. Because it can stem from both habits and genetics, it appears across many age groups and family backgrounds.
Yes, an open bite can be hereditary. The size, shape, and growth direction of the jaws are influenced by family genetics, so a jaw-based open bite can run in families. Research supports a real genetic component, especially for anterior open bites, though habits often play a role too.
Yes, an open bite can be corrected at almost any age. Children often benefit from stopping the habit early, while teens and adults can use clear aligners like Invisalign to close the gap. Severe jaw-based cases may need surgery. Retention keeps the result stable long-term.
Remember: An open bite is treatable at almost any age, and finding the cause is the first step. Early evaluation at Preston Dental Loft leads to simpler, more lasting results.
Disclaimer: This article is for general information only and is not a substitute for professional dental advice. Please consult Dr. Meenal Patel for guidance specific to your situation.
