What Is a Crossbite — and Why Does It Matter in Growing Kids? | Jawz Orthodontics
A crossbite can affect more than appearance. Learn what parents should watch for, why it matters during growth, and when an orthodontic evaluation may help.

Sometimes parents notice something about their child’s bite that just seems a little off.
Maybe a top tooth sits behind a bottom tooth. Maybe the back teeth do not line up the way they should. Maybe chewing looks uneven, or the jaw seems to shift when the child bites down.
Those concerns can sometimes point to a crossbite.
At Jawz Orthodontics, care is built around more than straight teeth. The practice emphasizes function, health, and confidence working together, and Dr. Sara’s clinical focus includes complex bite conditions and sleep-disordered breathing in addition to comprehensive orthodontic treatment.
What is a crossbite?
A crossbite is a type of bite problem in which certain upper teeth bite inside the lower teeth instead of outside them. The American Association of Orthodontists says crossbites commonly show up in three forms: posterior crossbite in the back teeth, anterior crossbite in the front teeth, and buccal crossbite or Brodie bite, where upper back teeth bite completely outside the lowers.
In simple terms, the upper and lower arches are not fitting together the way they should.
What causes a crossbite?
According to the AAO, crossbites can develop from a mix of factors, including genetics, delayed loss of baby teeth, abnormal eruption of adult teeth, prolonged thumb sucking, or atypical swallowing patterns. The AAPD’s current best-practice document also includes crossbites among the developing dentition concerns that deserve careful diagnosis and timing decisions.
That matters because a crossbite is not always “just a crooked tooth.” Sometimes it reflects how the teeth are erupting. Sometimes it reflects how the jaws are developing.
What might parents notice at home?
Parents are often the first to spot signs such as:
- a top front tooth sitting behind a bottom tooth
- upper back teeth biting inside the lower teeth
- a jaw that shifts to one side when biting
- uneven chewing
- wear on certain teeth
- a smile or bite that looks off-center
The AAO notes that one of the clearest signs of a crossbite is when the upper teeth fit inside the lower teeth in the front and/or back when biting down normally.
Why can a crossbite matter during growth?
This is where early evaluation becomes important.
The AAO says that addressing a crossbite early, especially while a child’s face and jaws are still developing, can help prevent jaw shifting, lopsided or asymmetric jaw growth, and excessive or abnormal enamel wear. In more severe untreated cases, jaw surgery may eventually be needed.
The AAPD similarly states that early diagnosis and treatment of developing bite abnormalities can help support a stable, functional, and esthetic occlusion, and that treatment timing should be based on a proper diagnostic summary.
That does not mean every crossbite needs immediate treatment. It does mean it is worth evaluating thoughtfully while growth is still on your side.
Does every child with a crossbite need treatment right away?
Not always.
Some children need treatment sooner because the bite is affecting function or jaw development. Others may need monitoring, especially if the finding is mild or timing suggests a better window is coming. The AAO recommends that children have an orthodontic checkup no later than age 7 because, by then, enough permanent teeth are usually present to evaluate how the teeth and jaws are developing.
That philosophy fits Jawz well. The practice highlights early evaluations, orthopedic treatments, and personalized care for children, teens, adults, and patients who benefit from extra patience or accommodations.
How is a crossbite treated?
Treatment depends on the type of crossbite and how much of the bite or jaw is involved.
The AAO says treatment for growing patients may include a palatal expander to widen the upper jaw, followed by braces or clear aligners to help position the teeth properly. Cleveland Clinic also notes that palate expanders are commonly used to widen a narrow upper jaw and help correct conditions like crossbites and overcrowding.
In some cases, treatment is simpler when started during growth. In others, waiting too long can make correction more complicated.
What happens at an evaluation?
A good evaluation is about clarity, not pressure.
At Jawz, the overall message on the site is thoughtful orthodontic care centered on comfort, clarity, and confidence. The practice positions treatment planning around the individual rather than a one-size-fits-all approach.
For a child with a possible crossbite, that means looking at:
- how the teeth fit together
- whether the jaw shifts when biting
- whether the upper jaw seems narrow
- whether the issue looks dental, skeletal, or both
- whether the right next step is treatment now or monitoring
The Jawz approach
At Jawz Orthodontics, the goal is not to recommend treatment just because a problem is visible.
The better goal is to understand why the bite looks the way it does, whether growth is being affected, and whether acting now would create a better long-term result. That kind of individualized, function-aware approach is consistent with how Jawz describes its care overall.
Wondering if your child may have a crossbite?
If you have noticed a tooth sitting “the wrong way,” an uneven bite, jaw shifting, or chewing that does not look quite right, an orthodontic evaluation can help you understand what is going on.
Sometimes the answer is treatment.
Sometimes the answer is monitoring.
Either way, knowing earlier gives families better information and more options. The AAO’s guidance to have children screened by age 7 is designed for exactly that reason.







