How to Improve Maxilla Growth and Appearance

Maxilla growth is shaped by a combination of genetics and environment, and your options for changing it depend heavily on your age. In children, breathing habits, diet, tongue posture, and orthodontic appliances can meaningfully influence how the upper jaw develops. In adults whose midpalatal suture has fused, the picture narrows to specialized expansion devices or surgery. The internet is full of advice on this topic, and some of it oversimplifies what the research actually supports.

How Much of Your Maxilla Is Determined by Genetics

Before getting into what you can change, it helps to understand what you probably cannot. A twin study looking at palatal dimensions found that heritability estimates were high for all width measurements, maxillary depths, palatal surface areas, and palatal volumes, ranging from about 0.48 to 0.86.¹ A separate longitudinal study found that maxillary width was under strong genetic influence at age 9 (about 70%), and that genetic influence remained strong through age 15 (about 73%).² So the broad shape of your upper jaw is substantially inherited.

That same study, though, revealed something interesting about specific measurements. Intercanine width, the distance between the upper canines, started with a moderate genetic component at age 9 but shifted toward environmental influence by age 15, when environment accounted for about 84% of the variation.² Nasal width followed a similar pattern, switching from mostly genetic at 9 to mostly environmental by 15. This means that while the skeletal width of the maxilla itself is largely set by your genes, some features closely related to it, particularly in the dental arch, remain responsive to environmental forces well into adolescence.

Breathing Patterns and Their Effect on the Growing Maxilla

One of the strongest environmental signals acting on the developing maxilla is how a child breathes. A systematic review and meta-analysis found that children who breathe through their mouths consistently show steeper growth patterns in the face, with several angles measuring the vertical orientation of the jaw significantly increased compared to nasal breathers.³ A separate narrative review confirmed a consistent association between mouth breathing and maxillary narrowing, high-arched palates, increased vertical growth, and a higher rate of bite problems.⁴

The mechanism is straightforward. When the mouth hangs open, the tongue drops from the roof of the mouth, the cheeks press inward against the upper teeth without the tongue pushing back, and the jaw grows downward and backward rather than forward. Over years, these small daily forces add up to real structural change. If you are a parent noticing that your child is a habitual mouth breather, this is worth investigating. Allergies, enlarged tonsils or adenoids, and nasal obstruction are common treatable causes, and addressing them early can allow the maxilla to develop with more forward, horizontal growth.

Diet and Chewing Forces

The food you chew during growth matters more than most people realize. A longitudinal study on rats found that a soft diet led to narrower dental arches, a narrower maxilla overall, and a more set-back lower jaw. The maxilla was primarily affected in the transverse plane, becoming smaller and narrower.⁵ Another study found that while a soft diet hurt jaw bone turnover in both the upper and lower jaw, switching back to harder food recovered the collapsed bone metabolism during growth.⁶

This aligns with observations from evolutionary anthropology. Analysis of human skulls across the agricultural transition found modest but consistent directional differences in skull shape between foragers and farmers, with changes most pronounced in dairying populations and consistent with softer diets reducing the mechanical demands on the face.⁷ The practical takeaway for parents is that feeding children appropriately firm foods during development, things that require real chewing rather than soft processed food, supports healthier jaw growth. For adults, the ship has largely sailed on skeletal change from diet alone, but chewing harder foods still supports bone density in the jaw.

Tongue Posture and Myofunctional Habits

Where the tongue sits at rest has a genuine effect on how the upper jaw develops. When the tongue rests against the palate, it supports the upper dental arch and encourages healthy arch development. When it sits low in the mouth or pushes forward during swallowing, it can contribute to malocclusion over time.⁸ A study on tongue-tie found that restricted tongue mobility was associated with narrowing of the maxillary arch and elongation of the soft palate, suggesting that when the tongue cannot physically reach the roof of the mouth, the maxilla develops more narrowly.⁹

Myofunctional therapy, which involves exercises to retrain tongue posture, lip seal, and swallowing patterns, has shown benefits as a complement to orthodontics. One study found that patients receiving myofunctional therapy alongside orthodontic treatment had about a 25% greater decrease in a standard index measuring bite irregularity compared to those getting orthodontics alone, along with better facial profiles and higher satisfaction scores.¹⁰ The exercises themselves are not dramatic: they typically involve pressing the tongue to the palate, practicing nasal breathing, and relearning swallowing mechanics. The evidence supports them as a useful add-on, especially in children, though not as a standalone substitute for orthodontic or orthopedic treatment when a real skeletal problem exists.

Orthodontic Expansion in Children and Teens

For children with a narrow maxilla, the most established intervention is rapid maxillary expansion, which uses an appliance fixed to the upper teeth that is gradually widened, physically splitting the midpalatal suture and allowing new bone to fill the gap. This works reliably in growing patients because the suture has not yet fused. Beyond widening the arch, rapid maxillary expansion opens the base of the nasal cavity, reduces nasal airway resistance, and can prevent the development of facial asymmetry from untreated crossbites.¹¹

When the problem is not just width but forward position, a facemask (sometimes called a reverse-pull headgear) can bring the upper jaw forward relative to the lower jaw. This device hooks to the upper teeth and pulls the maxilla anteriorly. One study in Vietnamese children found that facemask therapy led to forward movement of the maxilla, rotation of the lower jaw, correction of crossbite into a positive overbite, and a more prominent, aesthetically pleasing facial profile. About 81% of patients had positive outcomes, with the best results in children aged 7 to 9.¹² Combining maxillary expansion with facemask therapy has proven effective for early skeletal problems where the upper jaw is underdeveloped relative to the lower.¹³

The timing message here is important. These orthopedic approaches work best before or during the adolescent growth spurt, when sutures are open and bone is actively remodeling. Waiting until adulthood closes off simpler, less invasive options.

When the Suture Fuses and What That Means

The midpalatal suture does not close on a fixed schedule, and this is one of the most misunderstood aspects of maxillary treatment. A study of people aged 10 to 25 using cone-beam CT found that about 40% of subjects still had an unfused suture (stages A, B, or C), while the most common stage overall was D, representing partial fusion, seen in about 38% of the sample.¹⁴ A histological study found that the earliest actual bone bridging across the suture appeared at age 21, while the oldest subject without any ossification was 54 years old. Even in the older group (26 and up), the median proportion of the suture that had turned to bone was only about 3%, and the maximum recorded was about 13% in a 44-year-old man.¹⁵

This variability explains why some adults respond to non-surgical expansion and others do not. Imaging the suture before treatment can help predict whether it will split. A suture that is mostly interdigitated bone is not going to open the same way as one that is still partly cartilaginous.

MARPE for Late Adolescents and Adults

Miniscrew-assisted rapid palatal expansion, or MARPE, was developed specifically to tackle the fusing suture problem. Instead of relying on the teeth to transmit force (as conventional expansion does), MARPE anchors directly into the palatal bone with small screws, concentrating force at the suture itself. A systematic review and meta-analysis found that MARPE produced an average increase of about 2.3 mm in maxillary basal bone width, about 2.7 mm in alveolar bone width, and roughly 2.2 mm in nasal floor width.¹⁶ The expansion follows a characteristic pattern, wider at the teeth and tapering toward the skull base.

A study in young adults showed that MARPE successfully separated the midpalatal suture, with the amount of skeletal expansion decreasing as you move upward: roughly 5.5 mm at the tooth crown level, about 3.2 mm at the root level, 2 mm at the maxillary bone, and less than 1 mm at the cheekbone level.¹⁷ One trade-off to be aware of: the bone on the cheek side of the back teeth gets thinner after expansion, and the gum line can recede slightly at the anchor teeth.

MARPE can work in middle-aged adults too, though success rates drop. A comparison of young adults versus middle-aged adults found that 100% of the younger group achieved suture opening, compared to 81% of the older group. When the suture did open, the amount of expansion was similar between groups.¹⁸ A finite element study also suggested that combining MARPE with micro-osteoperforations, tiny holes drilled in the bone to stimulate remodeling, may increase the amount of displacement achieved.¹⁹

Surgical Options When Expansion Is Not Enough

When MARPE fails or when the problem involves forward-backward position rather than width, surgery enters the picture. The two main procedures are surgically assisted rapid palatal expansion (SARPE) and Le Fort I osteotomy.

SARPE is used when only the transverse dimension needs correction. It involves surgically cutting through the bony buttresses of the maxilla so that an expansion device can widen the arch in patients whose sutures will not split on their own. A CT-based study found that SARPE produced significant overall expansion, though the widening was greater in the front of the palate than in the back.²⁰ It has proven to be a clinically effective and stable technique for correcting a narrow maxilla in adults who have stopped growing.²¹

Le Fort I osteotomy is the more comprehensive procedure, used when the entire maxilla needs to be repositioned. The surgeon cuts the upper jaw free from the rest of the skull and moves it forward, backward, up, or down. A recent study found that the average planned maxillary advancement was about 5.5 mm and the actual achievement was about 5.3 mm, a difference that was not statistically significant. Skeletal relapse at the key reference point averaged only 0.44 mm, or about 8% of the total movement.²² A 3D analysis of soft tissue after Le Fort I showed forward and lateral expansion around the upper lip and nose, widening of the midface, upward movement at the nasal tip, and widening and compression of the nostrils.²³ These are major surgeries with real recovery periods, but they are highly predictable when done by experienced surgeons.

What About Mewing and Orthotropics

No article on maxillary improvement would be honest without addressing the popularity of “mewing,” the practice of holding the tongue firmly against the palate with the goal of remodeling facial bone. The concept comes from orthotropics, a treatment philosophy developed by John and Mike Mew. A controlled study at the University of Alberta specifically evaluated the skeletal and dental changes from an orthotropic treatment protocol with exercises to improve orofacial posture. The conclusion was blunt: there was insufficient evidence to conclude that the treatment protocol had a meaningful effect on skeletal changes. After accounting for measurement errors and the long treatment durations involved, the differences in sagittal and vertical skeletal measurements were unlikely to be clinically significant. Males and females experienced the same growth changes regardless of whether they were in the treatment or control group.²⁴

This does not mean tongue posture is irrelevant during childhood, as the earlier evidence on tongue position and arch development shows. But the leap from “tongue posture influences developing bone in children” to “an adult can reshape their maxilla by pressing their tongue to the roof of their mouth” is not supported by current evidence. Adults looking for real structural change should explore MARPE or surgery rather than relying on exercises alone.

How Expansion Affects the Nose and Soft Tissues

One concern people have about maxillary expansion is what it does to the nose. Widening the palate also widens the nasal floor, which pushes the soft tissue of the nose outward. A systematic review of children treated with rapid maxillary expansion found that the width of the nostrils (alar width) increased by about 0.5 to 2.2 mm and the base of the nose widened by about 0.2 to 2.8 mm.²⁵ A meta-analysis confirmed that nasal width and alar base width showed significant changes after expansion, and that these increases persisted after retention.²⁶

For some patients, this is a welcome change, particularly those with narrow nasal passages and difficulty breathing. For others, the cosmetic widening of the nose is an unwanted side effect. The amount of change is proportional to the degree of expansion, and it tends to be modest in children. The airway benefits can be substantial: expansion significantly enlarges both the volume and the minimum cross-sectional area of the nasal airway.²⁷ A meta-analysis found that adults with obstructive sleep apnea tend to have a constricted maxillary arch and reduced pharyngeal airway space compared to healthy controls, reinforcing the link between maxillary form and breathing.²⁸

The Maxilla and Facial Attractiveness

There is a reason people care about maxillary position: it heavily influences how the face looks. A 3D morphometric study found that facial shapes associated with higher convexity, where the upper jaw sits too far forward relative to the lower, were rated less attractive.²⁹ But that does not mean a flatter maxilla is better. A separate study manipulating the protrusion of the upper teeth in a female profile found a pattern of preference for normal or slightly protrusive positioning, suggesting a youthful quality in a fuller upper jaw.³⁰ The sweet spot appears to be adequate forward projection without excess, providing support for the upper lip and cheek area without creating an overly convex profile.

How the Maxilla Changes With Aging

Even if you had ideal maxillary development, aging gradually erodes it. The maxilla resorbs over the decades, losing projection and volume. A review of the research noted that the angle of the anterior maxilla decreases by about 10 degrees between young adults (under 30) and older adults (over 60), meaning the bone literally retreats backward with age.³¹ A study of medieval European skulls found that all maxillary measurements decreased with age, with the overall percentage of reduction reaching roughly 13 to 15% in women and 8 to 14% in men, depending on the location measured. The loss was dramatically worse in people who had lost their teeth.³²

This bone loss contributes to the “hollowing” appearance of the midface in older adults and is one reason why procedures like Le Fort I advancement and filler injections are used in facial rejuvenation. Keeping your teeth is one of the most protective things you can do, since the mechanical stimulus of biting and chewing helps maintain the alveolar bone that supports maxillary height and projection.