Fixing a Crossbite After the Jaw Has Set

What a Crossbite Actually Is

A crossbite is a specific kind of misalignment: instead of the upper teeth sitting slightly in front of the lower teeth when the jaw closes, one or more upper teeth close inside — behind — their lower counterparts. It can affect a single front tooth, several teeth on one side, or the whole arch, and it can come from the position of the teeth, the width of the jawbone itself, or both together.

Types of malocclusion — the umbrella term that also covers overbite, underbite, and crowding — group crossbite alongside these other bite problems because they share a diagnostic approach: an orthodontist evaluates the teeth and the underlying jaw bones separately, since two people with an identical-looking crossbite can need completely different treatment depending on which one is actually off.

Why Adult Timing Changes the Treatment

The mid-palate suture — the seam running down the center of the roof of the mouth — is still separated by cartilage in a growing child, which is what allows a palatal expander to gradually widen the upper jaw with gentle, sustained pressure. In an adult, that suture has fused into solid bone, so the same expander mostly just tips the teeth outward along the existing bone rather than widening the jaw itself.

That's the core reason an adult crossbite often needs a combined approach that a child's rarely does: orthodontic movement of the teeth plus, when the crossbite is truly skeletal rather than just dental, a surgical step to reopen that fused suture before expansion can work the way it would have in childhood. The later the crossbite is treated, the more likely it needs a surgical component, not just braces.

What Untreated Crossbite Does Over Time

A crossbite concentrates biting force onto a smaller area of tooth surface than a normal bite spreads it across, and over years that uneven load shows up as accelerated enamel wear, chipped edges on the teeth taking the extra force, and sometimes gum recession on the side bearing the crossbite. The jaw joint absorbs some of that imbalance too, and temporomandibular disorders — a group of more than 30 conditions causing pain or dysfunction in the jaw joint and chewing muscles — are more common when the bite is forcing the jaw to find an asymmetric resting position 1Ref 1National Institute of Dental and Craniofacial Research (2024).Temporomandibular Disorders.TMDs are a group of more than 30 conditions causing pain and dysfunction in the jaw joint and muscles, which an uneven bite can contribute to..

Many TMD cases still improve with conservative, non-surgical management regardless of the underlying bite 2Ref 2U.S. National Library of Medicine (2024).Temporomandibular Disorders.Many TMD cases improve with conservative, non-surgical care., but correcting a crossbite removes the mechanical cause instead of only treating the symptom it produces. Speech can be affected too in more pronounced cases, since the tongue and lips adapt around whatever bite pattern is present, and some adults notice a shift in how certain sounds feel once a long-standing crossbite is finally corrected — a change patients sometimes don't expect going into treatment.

Adult Crossbite Treatment Options

Adult teeth straightening for a crossbite generally falls into three tiers, chosen by how much of the problem is dental versus skeletal. Purely dental crossbites — where the teeth, not the jawbone width, are misaligned — often respond to braces or clear aligners alone, using elastics or specific attachments to walk the tooth into the correct position over several months. Skeletal crossbites, where the upper jaw itself is too narrow, may need a slower expansion appliance anchored to the back teeth or, for the most pronounced cases, surgically assisted rapid palatal expansion, where a surgeon creates a controlled separation in the fused suture so an expander can then do its work.

• Braces or aligners alone: for crossbites limited to tooth position, not jaw width
• Slow expansion plus orthodontics: for mild-to-moderate skeletal narrowing
• Surgically assisted expansion plus orthodontics: for jaw width that braces alone cannot correct

Clear aligners can correct some adult crossbites, but the American Association of Orthodontists has specifically warned that moving teeth is a medical procedure that belongs under in-person supervision by a licensed professional, after an AAO member survey found 77% of orthodontists had treated patients needing retreatment following direct-to-consumer aligner therapy that skipped that diagnosis step 3Ref 3American Association of Orthodontists (2024).AAO Highlights Health Risks of Mail-Order Orthodontics.The AAO's position that tooth movement should be supervised in person by a licensed professional, and the survey finding that 77% of orthodontists treated patients needing retreatment after direct-to-consumer aligner therapy..

Does Insurance Cover Adult Crossbite Correction

Coverage for adult orthodontic treatment is inconsistent, and it gets more complicated once a case needs a surgical component. Traditional Medicare has excluded routine and major dental services, including orthodontic and most oral surgery care, since 1965, with only narrow exceptions 4Ref 4KFF (Kaiser Family Foundation) (2024).Coverage of Dental Services in Traditional Medicare.Traditional Medicare has excluded routine and major dental services since 1965, with only narrow exceptions., so most adults facing crossbite correction are paying through private dental insurance, medical insurance for the surgical portion, or out of pocket. Does insurance cover braces is a question with a different answer for every plan: some dental policies carry a separate, capped orthodontic lifetime maximum that applies regardless of age or medical necessity.

Medicaid adult dental benefits vary by state both in what's covered and how generously, and utilization among adult enrollees differs substantially from state to state as a result 5Ref 5KFF (Kaiser Family Foundation) (2024).Access to Dental Care in Medicaid: Spotlight on Nonelderly Adults.Adult Medicaid dental benefits vary widely by state in scope, and utilization among adult enrollees varies substantially across states.. When a crossbite is severe enough to require jaw surgery, that surgical portion is sometimes classified as medical rather than dental, which changes which insurance actually applies — worth confirming before treatment starts, not after.

What to Expect From Evaluation Through Retention

An orthodontic workup for an adult crossbite starts with imaging that separates tooth position from jaw position, because treating a skeletal problem as though it were only a dental one is a common reason a crossbite corrects and then relapses. From there, treatment length runs longer than average for adult orthodontics, often 18 months to several years when surgery is involved, and it ends the same way every orthodontic case does: with a retainer, because a jaw that has just been surgically or orthodontically repositioned has no natural tendency to stay put on its own.

TMJ treatment options are sometimes folded into the same care plan when jaw pain was part of the original picture, since correcting the crossbite doesn't automatically resolve joint symptoms that have been present for years.