Facial asymmetry is common to some degree, but when the difference between the two sides of the face is caused by an underlying jaw or skeletal imbalance, it can affect both facial appearance and the way the teeth come together. In these situations, orthodontic treatment alone may not be enough because braces can move teeth but cannot reposition an incorrectly developed jaw.
Jaw surgery, also called orthognathic surgery, may be considered when facial asymmetry is related to the position, size, or shape of the upper jaw, lower jaw, or both. The aim is not simply to make the face look more even. Treatment is planned around the underlying skeletal imbalance, bite, facial proportions, and functional needs.
What Causes Facial Asymmetry?
Facial asymmetry can have many causes. Some differences develop naturally as the face grows, while others may result from an underlying condition, trauma, previous surgery, or an abnormal growth pattern. When the jaws are involved, asymmetry may appear as:
- A chin that deviates noticeably to one side
- An uneven or tilted bite
- A shift in the dental midline
- One side of the lower face appearing longer or fuller than the other
- An uneven relationship between the upper and lower jaws
- Differences in the height or position of the jaw on each side
- An asymmetric facial profile when viewed from the front or side
Facial asymmetry can involve the teeth, jawbones, soft tissues, or several of these structures at the same time. This is why the first step is determining exactly where the asymmetry originates rather than assuming that surgery is automatically required.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
When Is Jaw Surgery Considered for Facial Asymmetry?
Minor facial differences usually do not require surgical correction. Orthognathic surgery becomes more relevant when the asymmetry is caused by a significant skeletal discrepancy and is associated with a problematic bite or functional difficulty.
For example, surgery may be considered when the lower jaw is significantly shifted to one side and this is accompanied by a crossbite, dental midline discrepancy, or an uneven occlusal plane. In other cases, the upper jaw may be tilted, causing the teeth and smile line to appear uneven.
The decision depends on the underlying anatomy rather than on appearance alone. A person may have noticeable facial asymmetry but have no skeletal problem that requires jaw surgery. Conversely, a relatively subtle difference may be associated with a significant jaw or bite discrepancy.
How Do Surgeons Determine the Source of the Asymmetry?
Facial asymmetry requires detailed assessment because several structures can contribute to the final appearance of the face.
The evaluation may include:
- Facial examination: The surgeon assesses facial proportions, chin position, jaw contours, symmetry and the relationship between different facial landmarks.
- Bite assessment: The upper and lower dental midlines, crossbite, occlusal plane and overall tooth relationship are examined.
- Photographs: Standardized facial photographs can help assess symmetry from the front, side and other views.
- Dental and skeletal imaging: X-rays and three-dimensional imaging may be used to examine the jaws and identify the direction and extent of skeletal discrepancy.
- Three-dimensional analysis: In more complex cases, 3D assessment can help evaluate horizontal, vertical and rotational differences that may be difficult to appreciate on conventional two-dimensional images.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
This assessment helps establish a reference for the facial midline and determine whether the asymmetry is primarily dental, skeletal, soft-tissue related, or a combination.
Can Braces Correct Facial Asymmetry?
It depends on what is causing the asymmetry. If the difference is mainly related to tooth position, orthodontic treatment may be sufficient. Teeth can sometimes be moved to improve a dental midline discrepancy or compensate for a relatively mild skeletal imbalance.
However, orthodontics cannot change the fundamental position or shape of a mature jawbone. If the upper or lower jaw itself is significantly deviated, tilted, rotated, or positioned incorrectly, moving the teeth alone may not fully correct the facial or functional problem.
This distinction is important because some patients seek treatment for facial asymmetry when the underlying problem is skeletal. In such cases, the treatment plan may involve a combination of orthodontics and orthognathic surgery.
What Type of Jaw Surgery Is Used for Facial Asymmetry?
There is no single operation used for every asymmetric face. The procedure depends on which jaw or structures are responsible for the imbalance.
Lower Jaw Surgery
If the primary problem is a mandibular deviation, surgery may reposition the lower jaw to improve its relationship with the upper jaw and bring the chin closer to the planned facial midline.
This may be considered when the asymmetry is accompanied by problems such as a crossbite, lower dental midline shift, or significant mandibular deviation.
Upper Jaw Surgery
The upper jaw can contribute to asymmetry through vertical differences, transverse discrepancies or an uneven occlusal plane. Maxillary surgery can reposition the upper jaw in three dimensions when required.
Correcting the position of the upper jaw can also influence the appearance of the smile, dental midline and overall facial balance.
Double Jaw Surgery
When both jaws contribute to the asymmetry, bimaxillary or double jaw surgery may be considered. This allows the surgeon to correct the position of the maxilla and mandible together rather than trying to compensate for one jaw by moving the other excessively.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Double jaw surgery can be particularly relevant when asymmetry involves several planes of movement, such as a combination of horizontal deviation, vertical canting and rotational differences.
Why Is 3D Planning Often Useful in Asymmetric Jaw Surgery?
Facial asymmetry is inherently three-dimensional. A jaw may be shifted sideways while also being rotated or positioned higher on one side. Looking at only one angle may therefore provide an incomplete picture.
Three-dimensional imaging and virtual surgical planning allow the surgical team to examine the facial skeleton from different directions and simulate planned movements before surgery. This can be particularly helpful when several skeletal components contribute to the asymmetry.
Three-dimensional planning does not guarantee a perfectly symmetrical result, and research comparing virtual and conventional planning has produced mixed findings on some measures. However, it can provide useful visualization and may be particularly valuable in complex asymmetric cases.
What Happens During the Treatment Process?
Jaw surgery for facial asymmetry is usually part of a broader orthodontic and surgical treatment plan rather than an isolated procedure. The process commonly involves:
- Detailed assessment: The facial skeleton, teeth, bite and soft tissues are evaluated.
- Orthodontic preparation: Braces may be used before surgery to position the teeth appropriately for the planned jaw movements.
- Surgical planning: The surgeon and orthodontist determine how much each jaw needs to move and in which direction.
- Orthognathic surgery: The affected jaw or jaws are repositioned according to the surgical plan and stabilized.
- Postoperative orthodontics: Further orthodontic treatment may be required to refine the bite after the jaws have healed.
- Follow-up: Facial symmetry, bite, healing and jaw stability are monitored over time.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Will Jaw Surgery Make the Face Completely Symmetrical?
The goal is to improve facial balance rather than promise mathematical symmetry. Even people without a jaw deformity normally have some degree of facial asymmetry. In addition, soft tissues do not always respond to skeletal movement in exactly the same proportion.
Research in patients treated for facial asymmetry has found that soft tissues generally follow underlying skeletal movements, but the amount of movement can differ between facial regions.
For this reason, a successful outcome is usually assessed by looking at several factors together: skeletal alignment, dental midlines, bite, chin position, facial proportions and overall harmony. It is also possible for a small degree of asymmetry to remain after surgery. This does not necessarily mean that treatment has failed.
What About Recovery?
Recovery is broadly similar to other forms of orthognathic surgery, although the exact experience depends on whether one or both jaws are operated on.
Swelling and discomfort are usually most noticeable during the early postoperative period. As healing progresses, eating, speaking and normal daily activities gradually become easier. The visible appearance of the face can continue changing as swelling settles, so the early postoperative appearance should not be considered the final result.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Bone healing occurs over several weeks, while refinement of facial contours and sensory changes can continue for considerably longer. Follow-up appointments are important for monitoring both the bite and the stability of the corrected jaw position.
What Are the Possible Risks?
Like other major jaw procedures, orthognathic surgery carries potential risks. These may include infection, bleeding, changes in sensation, bite changes, relapse of jaw position, temporomandibular joint symptoms and problems related to fixation hardware.
Lower jaw surgery can affect sensation in areas supplied by nerves near the surgical site, particularly the lower lip and chin. Altered sensation may improve gradually, although some patients can experience longer-lasting changes.
The risk profile depends on the procedure performed, the amount and direction of jaw movement and individual anatomy. A detailed surgical assessment is therefore important before deciding whether surgery is appropriate.
The Bottom Line
Jaw surgery can be an important treatment option when facial asymmetry is caused by an underlying skeletal jaw discrepancy, particularly when the imbalance is also affecting the bite or jaw function. The treatment is not simply about moving the chin toward the middle. It involves understanding how the upper jaw, lower jaw, teeth and surrounding soft tissues relate to one another.
A detailed examination and appropriate imaging help determine whether the asymmetry is dental, skeletal or a combination of factors. Depending on the underlying problem, treatment may involve orthodontics alone, surgery on one jaw, or coordinated surgery on both jaws. The objective is to create a more balanced facial structure and functional bite while maintaining a stable result over time.
