Short answer: Jaw expansion is possible in adults, but because the bony connection in the middle of the palate hardens with age, the method is chosen individually. Dental expansion, MARPE or surgically assisted expansion may be considered. Clear aligners can widen the dental arch to a limited extent; they do not widen the bone. The right method is determined by an examination and imaging.
Jaw expansion in adults is possible; however, unlike in children, it cannot always be done with the same method or with the same ease. Once growth is complete, the bony connections in the upper jaw become firmer, so the type of expansion that is appropriate must be determined carefully. In this article we give a general overview of the approaches that can be used for a narrow palate in adults, MARPE and surgically assisted options, the limits of clear aligners and the risks to keep in mind. For an overview of the devices, see our orthodontic appliances page.
Can the upper jaw be expanded in adults?
Yes, the upper jaw can be expanded in adults; however, the method is chosen according to the person's age, bone structure and the nature of the narrowing. In some adults only the arch holding the teeth is widened, while in others approaches that act on the bone structure itself are considered.
In adults, a narrow upper jaw can cause findings such as crossbite, crowded teeth, dark spaces between the cheeks and teeth in a broad smile (the "black corridor") and the jaw shifting to one side during chewing. Not all of these findings are necessarily caused by narrowing, which is why the underlying cause is identified through an examination and imaging. For how crossbite is managed with clear aligners, you can also see our crossbite treatment with clear aligners page.
A narrow palate can have functional as well as aesthetic effects. When the upper and lower teeth do not fit together, chewing habits can change, and some people may complain of strain in the jaw joint or muscles. How each of these relates to narrowing varies from person to person, and an orthodontic examination is needed to establish a definite link.
The difference between children and adults: suture closure
The main difference lies in the bony connection in the middle of the palate, the suture, which joins the two halves of the upper jaw. In children this connection is flexible and opens easily under an expansion force. With age, the suture interlocks through bony projections and gradually becomes firmer.
This process varies from person to person; age alone does not set a definite limit. In some young adults the suture may still be flexible enough, while others may need a stronger approach for expansion. The dentist can assess the condition of the suture with imaging methods such as CT. To learn about the approach in children, you can read our article on the jaw expansion appliance.
In adults, the expansion plan is usually assessed together with gum health, existing fillings and crowns, missing teeth and general medical history. For this reason, different methods may be chosen even for two patients who look similar.
Which methods are used in adults?
The main methods used in adults vary depending on whether the narrowing is dental or skeletal. After the examination, the dentist may plan one or several of them in sequence:
- Dental expansion: Widening the dental arch to a limited extent with fixed appliances, spring appliances or clear aligners
- Conventional fixed expander: A screw-type device attached to the teeth; in adults it mostly tips the teeth outward
- MARPE: An expander supported by small screws placed in the palatal bone
- Surgically assisted expansion: An approach in which the bony connection is released surgically and then widened with an appliance
MARPE, or miniscrew-assisted rapid palatal expansion, is a method that aims to transfer the force of the appliance to the palatal bone rather than to the teeth. It can be considered especially for skeletal expansion in young adults. Its success depends on the person's bone structure, opening of the suture cannot be predicted with certainty in every patient, and results vary individually. It should be planned and monitored by an experienced orthodontist.
In surgically assisted expansion, the bony connection is usually released by an oral and maxillofacial surgeon; the orthodontist then activates the expander at set intervals. Because this approach involves surgery, it is considered for older patients and for pronounced skeletal narrowing. The patient, surgeon and orthodontist need to make the decision together. The full treatment usually consists of expansion, a waiting and stabilization phase, and tooth alignment; the length of each phase varies from person to person.
Dental expansion versus skeletal expansion
In dental expansion the teeth tip outward, whereas in skeletal expansion the two halves of the upper jawbone separate. In other words, in the first the bone stays the same while the position of the teeth changes; in the second the width of the palatal bone increases.
In practical terms, this distinction means that dental expansion has a limit. Teeth can only be moved within a certain area inside the bone; if this limit is exceeded, the risk of gum recession, reduced bone support or excessive tipping of the teeth may increase. If the narrowing is skeletal and dental expansion is not enough, the dentist may suggest MARPE or a surgically assisted approach. The choice is made by the patient and dentist together, weighing risks and benefits.
Oral hygiene needs special attention during expansion. Appliances around the palate can trap food, and speaking and swallowing may feel different in the first days. For most people this adjustment period passes quickly; if it does not, consult your dentist. A gap opening between the front teeth can also be a sign of expansion and is addressed in the later alignment phase.
Do clear aligners expand the jaw in adults?
In adults, clear aligners can widen the dental arch to a limited extent, but they do not widen the upper jawbone. The effect is dental: the arch holding the teeth widens while the bone structure stays the same. This may be sufficient for mild crowding and mild crossbite issues.
Orthodontics with Invisalign offers the advantage of digital planning for this type of dental expansion. However, in pronounced skeletal narrowing, clear aligners alone may not be the solution; in that case a staged plan can be made, such as expansion first and then alignment with aligners. For treatment in adults, see our Invisalign for adults page. Suitability for clear aligners always depends on the result of the examination.
It is important to set realistic expectations here. By aligning the teeth and organizing the space between them, aligners can make the smile look more balanced, but they do not change a narrow palate at the bone level. The dentist explains this difference and decides, together with the patient, on the path that fits the patient's goals.
Risks and things to keep in mind
Jaw expansion in adults requires more careful planning than in children, because the bone, gums and root structures are all less flexible. Possible risks vary depending on the method used.
In general, keep the following points in mind:
- Pressure, aching and a gap between the front teeth may occur during expansion.
- If dental expansion is overdone, there may be a risk of gum recession and reduced bone support.
- The bone structure may not respond adequately to expansion; in that case the plan may change.
- Surgically assisted methods are assessed separately because they involve surgery, anesthesia and a recovery period.
- Retention is required after expansion; otherwise relapse may occur.
A retention period is essential to maintain the width achieved after expansion; if this phase is skipped, the teeth and jaw may tend to drift back toward their former position. For details, see our article on the retainer. These risks should be known not as a reason to give up on treatment, but in order to choose the right method. A detailed assessment such as CT may be needed for each candidate, so the decision is made after the examination.
Bringing any previous X-rays or CT scans, a list of the medications you take and information about past dental treatment to your appointment speeds up planning. Writing down the questions you want to ask the dentist in advance and sharing your expectations openly also makes the process easier.
Adult orthodontic assessment in Ankara
If you have a narrow palate, crossbite or complaints related to chewing or your smile, an orthodontic examination will help clarify your options. At our clinic in Park Oran, Çankaya, after the assessment the appropriate method, the estimated process and fee information are shared in writing; in cases requiring surgery, the plan is made together with the relevant specialties. To book an appointment, you can use our contact page.
Frequently asked questions
Can jaw expansion be done in adults?
Yes, but the method is chosen according to age, bone structure and the type of narrowing. In some people dental expansion is enough, while others may need MARPE or surgically assisted expansion. The decision is made after an examination and imaging.
What is MARPE?
MARPE is a rapid palatal expansion appliance supported by miniscrews placed in the palatal bone. It aims to transfer the force to the bone rather than to the teeth. It can be considered especially for skeletal expansion in young adults, but results vary from person to person.
Does jaw expansion in adults require surgery?
Not always. Dental expansion or MARPE may be sufficient. If the bony connection has become very firm and the narrowing is pronounced, surgically assisted expansion may be considered.
Do clear aligners widen the palatal bone in adults?
Clear aligners can widen the dental arch to a limited extent but do not widen the palatal bone. In pronounced skeletal narrowing they may not be enough on their own. An orthodontic examination shows whether they are suitable.
What can a narrow palate cause in adults?
Crossbite, crowded teeth, the jaw shifting during chewing and side gaps when smiling may be seen. These findings are not always caused by narrowing. A dental examination is needed for a definitive assessment.
