If your child’s dentist has mentioned a crossbite, or if you have noticed that your child’s teeth do not seem to line up the way they should, you are not alone. Crossbites are one of the more common bite problems seen in growing children, and they are worth taking seriously.
A crossbite happens when some of the upper teeth sit inside the lower teeth instead of outside them. It can affect the front teeth, the back teeth, or both. While it may look like a simple alignment issue, a crossbite can affect how your child’s jaw grows, how they chew, and how their face develops over time.
Bite development and jaw growth are closely connected in children. The bones and structures of the face are still forming, which means that problems caught early can often be managed more effectively than those addressed later.
At smilebuilderz, our pediatric dentistry and orthodontic teams in Lancaster, Ephrata, and Lititz monitor bite development as part of routine care. We work with families across Lancaster County to identify concerns early and create individualized plans for each child.
This guide will help you understand what a crossbite is, what causes it, what signs to look for, and what treatment options are available for children in Lancaster, Ephrata, and Lititz.
What Is a Crossbite?
In a healthy bite, the upper teeth close slightly outside the lower teeth, like a lid fitting over a box. When that relationship is reversed, even partially, it is called a crossbite.
A crossbite is a type of malocclusion, which is the clinical term for a misaligned bite. It can involve one tooth, a few teeth, or an entire section of the mouth. Because it affects how the upper and lower jaws relate to each other, it can have an impact on jaw development and facial growth over time.
Anterior Crossbite vs. Posterior Crossbite
Anterior crossbite involves the front teeth. One or more upper front teeth sit behind the lower front teeth when your child bites down. Parents sometimes describe this as the child’s bottom teeth sticking out in front.
Posterior crossbite involves the back teeth. The upper back teeth close inside the lower back teeth on one or both sides. A unilateral crossbite affects one side, while a bilateral crossbite affects both sides. Posterior crossbites are more commonly linked to a narrow upper jaw.
Dental Crossbite vs. Skeletal Crossbite
Dental crossbite is caused by the position of individual teeth. The jaw structure itself may be normal, but one or more teeth have erupted in the wrong direction.
Skeletal crossbite involves the jaw bones themselves. The upper jaw (maxilla) may be narrower or positioned differently relative to the lower jaw (mandible). Skeletal crossbites are more complex and often require growth modification treatment, such as a palatal expander, to address the underlying jaw relationship.
Understanding which type your child has is one reason an orthodontic evaluation matters. Treatment planning looks very different depending on the diagnosis.
What Causes Crossbites in Children?
Crossbites rarely develop from a single cause. Most cases involve a combination of growth patterns, genetics, and developmental factors.
Narrow Upper Jaw Development
One of the most common contributors to a posterior crossbite is a narrow upper jaw. When the maxilla does not develop wide enough, the upper back teeth end up sitting inside the lower back teeth. This is sometimes called maxillary constriction.
A palatal expander is often recommended in these cases to widen the upper jaw gradually during the growth years, when the mid-palatal suture is still open and responsive to expansion.
Genetics and Facial Growth Patterns
Jaw structure and facial growth patterns tend to run in families. If a parent or close relative had a crossbite or significant bite problem, their children may be more likely to develop one as well. Inherited skeletal patterns in the maxilla or mandible can influence how the bite develops during childhood.
Delayed or Abnormal Tooth Eruption
When primary teeth fall out too early or too late, or when permanent teeth erupt in an unexpected direction, the dental arch can become crowded or imbalanced. Insufficient arch space, eruption abnormalities, or an impacted canine can all contribute to crossbite development during the mixed dentition phase, when children have both baby teeth and permanent teeth coming in.
Parents who want to understand what a normal eruption sequence looks like can find more details in the tooth eruption timeline for kids.
Thumb Sucking and Oral Habits
Prolonged thumb sucking, extended pacifier use, and certain tongue posture habits can influence how the jaws and dental arch develop over time. These habits can narrow the upper arch or push teeth out of alignment. The impact depends on how long and how frequently the habit occurs. This is a developmental concern, not a parenting failure.
Mouth Breathing and Airway Factors
Children who breathe primarily through their mouths, often due to allergies, enlarged tonsils, or nasal congestion, may develop changes in tongue posture and facial growth patterns. Mouth breathing can be associated with a narrower palate and altered craniofacial development. Orthodontists sometimes evaluate airway-related factors when assessing bite development, particularly when a narrow palate or posterior crossbite is present.
Signs Your Child May Have a Crossbite
Some crossbites are obvious. Others are subtle and easier for a dental provider to spot than a parent. Here are some things to watch for.
Upper Teeth Sitting Behind Lower Teeth
If you look at your child’s bite from the side or front and notice that the upper front teeth are behind the lower front teeth, that is a visible sign of an anterior crossbite. In some cases, only one tooth is affected.
Jaw Shifting During Biting
Some children shift their jaw to one side when they close their teeth together. This is called a functional shift, and it happens when the teeth guide the jaw into an uncomfortable or uneven position. Over time, this can affect jaw symmetry and development.
Uneven Tooth Wear
When teeth do not meet properly, some surfaces take on more contact than they should. Abnormal tooth wear on specific teeth, especially in younger children, can be a sign that the bite relationship needs evaluation.
Difficulty Chewing
Children with crossbites may chew less efficiently or favor one side of the mouth. Bite inefficiency can make eating certain foods harder and may place extra strain on jaw muscles over time.
Facial Asymmetry Concerns
In some cases, an untreated crossbite, particularly one with a functional shift, can contribute to uneven jaw development over time. If you notice that your child’s chin or jaw appears to be shifting to one side as they grow, it is worth bringing up with your dental provider.
Concerns Identified During Dental Visits
Pediatric dentists often notice bite alignment issues before parents do. Routine dental visits include a look at how the teeth come together and how the jaws are developing. If your child is due for a checkup, pediatric dentistry at smilebuilderz includes growth monitoring as part of routine care at our Lancaster and Ephrata locations. Early detection at a preventive appointment is one of the most common ways crossbites are first identified.
Why Early Treatment Matters for Crossbites
This is the part many parents want to understand most. Why does timing matter?
Guiding Jaw Growth During Development
Children’s jaws are still growing and responsive to guidance in ways that adult jaws are not. Orthodontic growth modification during childhood can redirect jaw development in a way that is simply not possible once the growth plates have closed. This window of opportunity is one of the primary reasons an early orthodontic evaluation is recommended for children showing signs of a bite problem.
Preventing Worsening Bite Problems
Crossbites do not typically resolve on their own, and many become more pronounced as the jaw continues to grow. A bite problem that is manageable at age seven or eight can become significantly more complex by the teenage years if left unaddressed.
Supporting Balanced Facial Development
When a crossbite involves a functional shift, the jaw may develop unevenly over time. Early crossbite correction in children can help support more balanced facial and skeletal development during the critical growth years.
Reducing Future Orthodontic Complexity
Addressing a crossbite early through phase 1 orthodontics or interceptive treatment does not always eliminate the need for future orthodontic care, but it can make that care simpler. Creating adequate arch width and correcting bite relationships early gives permanent teeth more room to erupt in better positions.
Improving Long-Term Oral Function
A corrected bite supports more efficient chewing, better jaw function, and reduced strain on the teeth and joints. Healthy bite mechanics established during childhood contribute to better long-term oral function.
How Orthodontists Treat Crossbites in Growing Children
Treatment depends on your child’s age, growth stage, the type of crossbite, and the degree of skeletal involvement. There is no single approach that fits every case.
Palatal Expanders
A palatal expander is one of the most commonly used appliances for posterior crossbite correction in children. It works by gradually widening the upper jaw, creating more arch width, and correcting the relationship between the upper and lower teeth. Expansion is most effective during the growth years, when the mid-palatal suture responds well to gentle, consistent pressure.
Limited Early Orthodontic Treatment
Phase 1 orthodontics, also called interceptive orthodontic treatment, is a targeted course of treatment for specific problems identified in younger children, typically between ages seven and ten. It is not a full set of braces. It addresses a defined concern, such as a crossbite or severe crowding, and is followed by a period of monitoring before any phase 2 treatment is considered.
Braces for Crossbite Correction
For dental crossbites or cases requiring tooth movement and bite refinement, braces remain a reliable and effective option. Brackets and wires allow orthodontists to position individual teeth precisely, correct occlusion problems, and align the dental arch.
Clear Aligners in Appropriate Cases
In select cases, particularly for older children and teens, clear aligners such as Invisalign Teen may be appropriate for crossbite correction. Not every crossbite is suited to aligner therapy, especially in cases with significant skeletal involvement.
Families weighing their options can find a detailed side-by-side look at Invisalign vs. braces for teens to better understand how the two approaches compare. An orthodontic consultation will determine whether aligners are a good fit for your child’s specific situation.
Monitoring and Observation
Not every crossbite requires immediate treatment. In some cases, particularly minor dental crossbites in younger children who are still in the mixed dentition phase, periodic evaluation and growth monitoring may be the appropriate first step. The goal is to act at the right time, not necessarily the earliest possible time.
What Happens During a Crossbite Evaluation?
If you schedule an orthodontic consultation for your child, here is what to expect.
Orthodontic Examination
The orthodontist will examine how your child’s teeth come together, look for signs of jaw shifting or functional shift, assess tooth wear, and evaluate the dental arch. This is a clinical bite assessment combined with a growth evaluation.
Digital Imaging and Diagnostics
Most evaluations include digital X-rays to assess bone development, tooth eruption patterns, and any impacted teeth. Photographs and intraoral scans may also be taken to capture the current state of the bite and arch.
Evaluating Jaw Growth Patterns
For crossbites with a skeletal component, the orthodontist will assess the current relationship between the maxilla and mandible and consider how ongoing jaw growth may affect the bite. Growth forecasting helps determine the best time to begin treatment.
Creating an Individualized Treatment Plan
Every child’s bite is different. The treatment plan will account for your child’s age, growth stage, the type and severity of the crossbite, and your family’s goals. Families in Lititz and across Lancaster County can expect a personalized recommendation rather than a one-size-fits-all approach. Some children begin active treatment right away. Others are placed on a monitoring schedule with re-evaluation at regular intervals.
Can Crossbites Correct Themselves?
This is a question many parents ask, and it deserves a direct answer.
Situations Where Monitoring May Be Appropriate
Very minor dental variations in young children sometimes resolve as primary teeth are replaced by permanent teeth. In these cases, watchful waiting with regular orthodontic monitoring may be appropriate. The key point is monitoring, not ignoring.
Why Most True Crossbites Do Not Self-Correct
Most established crossbites, particularly those involving the jaw structure or a functional shift, do not improve on their own. Skeletal factors tend to become more pronounced as the jaw continues to grow, not less. Waiting does not make a crossbite easier to treat.
Risks of Waiting Too Long
Delaying treatment past the optimal growth window can reduce the effectiveness of growth modification approaches and may increase the complexity of treatment later. In skeletal crossbite cases, especially, early intervention takes advantage of jaw flexibility that will not be available in adulthood.
Crossbites and Future Orthodontic Treatment
Early crossbite treatment is often one part of a longer orthodontic journey, not the end of it.
Relationship to Crowding
A narrow upper jaw does not just cause a crossbite. It also limits the space available for permanent teeth to erupt properly. Expanding the arch early can help reduce dental crowding and improve conditions for incoming permanent teeth.
Impact on Eruption Patterns
When the dental arch is too narrow or the bite relationship is off, permanent teeth can erupt in unusual positions. An impacted canine, for example, is sometimes associated with insufficient arch space. Early crossbite correction can improve eruption pathways.
Future Braces and Aligner Treatment
Many children who complete phase 1 orthodontic treatment for a crossbite will still go on to have braces or aligners during their teenage years. Phase 1 treatment addresses specific growth-related problems. Phase 2 treatment, if needed, focuses on full alignment and bite refinement once most permanent teeth have erupted.
Long-Term Bite Stability
Retention is part of any orthodontic outcome. Once crossbite correction is complete, retainers help maintain the corrected bite relationship. Long-term bite stability depends on both the quality of the correction and consistent retention afterward.
Frequently Asked Questions About Crossbites in Children
What is a crossbite in children?
A crossbite is a bite problem where one or more upper teeth close inside the lower teeth instead of outside them. It can affect the front teeth, back teeth, or both, and it may involve the position of individual teeth or the relationship between the upper and lower jaw.
At what age should a crossbite be evaluated?
The American Association of Orthodontists recommends that children have their first orthodontic evaluation by age seven. At this age, enough permanent teeth have erupted to identify bite problems, and enough growth remains to make correction more effective in appropriate cases.
Can a crossbite get worse over time?
Yes. Most true crossbites do not improve on their own. As the jaw continues to grow, a crossbite can become more pronounced, particularly when a functional shift is present. Early evaluation gives families more options.
Do all crossbites require treatment?
Not always. Minor dental variations in young children may be monitored before any treatment begins. However, established crossbites, especially those involving jaw structure, typically benefit from treatment during the growth years rather than after.
Can a palatal expander fix a crossbite?
A palatal expander is one of the most effective tools for correcting posterior crossbites caused by a narrow upper jaw. By gradually widening the maxilla, an expander can correct the width relationship between the upper and lower arches. It works best during childhood, when the palatal suture is still responsive.
Can braces correct a crossbite?
Yes, braces can correct dental crossbites by repositioning individual teeth and improving occlusion. For crossbites with a skeletal component, braces are often used after or alongside a palatal expander to refine the bite and align the teeth.
Will my child need braces after crossbite treatment?
Many children who have phase 1 orthodontic treatment for a crossbite will go on to have comprehensive orthodontic treatment with braces or aligners during their teen years. Phase 1 addresses specific growth concerns. Phase 2, if needed, completes the alignment process.
Is crossbite treatment painful?
Most children adjust to orthodontic appliances within a few days. A palatal expander or braces may cause mild soreness or pressure after adjustments, but significant pain is uncommon. Your orthodontic team will explain what to expect and how to manage any discomfort.
What happens if a crossbite is left untreated?
An untreated crossbite can lead to uneven jaw development, increased tooth wear, chewing difficulties, and greater treatment complexity later in life. Crossbites with a functional shift carry a higher risk of contributing to facial asymmetry if not addressed during the growth years.
How do I know if my child should see an orthodontist?
Signs that warrant an evaluation include upper teeth that sit behind lower teeth, jaw shifting when biting, difficulty chewing, uneven tooth wear, or a concern raised by your child’s pediatric dentist. When in doubt, an early orthodontic consultation provides clarity without commitment to treatment.
Schedule a Crossbite Evaluation for Your Child in Lancaster, Ephrata, or Lititz
If you have noticed something off about your child’s bite, or if your dentist has mentioned a possible crossbite, the next step is a professional evaluation. Catching a bite problem during the growth years gives your child more treatment options and allows the orthodontic team to monitor jaw development before issues become more complex.
At smilebuilderz, our orthodontic and pediatric dentistry teams serving Lancaster, Ephrata, and Lititz understand that every child grows differently. We take the time to assess each child’s bite, review growth patterns, and explain your options clearly before recommending any treatment.
Early assessment does not always mean immediate treatment. Sometimes it means having a baseline and a plan. Either way, you will leave knowing where your child stands.
To schedule a crossbite evaluation for your child at one of our Lancaster County locations, contact smilebuilderz today. Our team is here to answer your questions and help your child’s smile develop the right way.
