What Is a Crossbite?
A crossbite is a misalignment where one or more upper teeth sit inside the lower teeth when the jaws close. It is one of the most common bite problems orthodontists treat.
In a healthy bite, upper teeth sit slightly outside lower teeth all the way around the arch. With a crossbite, that relationship is reversed in one or more spots. The reversal can involve a single tooth or a whole section of the bite.
Crossbites fall into two main categories. An anterior crossbite affects the front teeth and is sometimes confused with an underbite. A posterior crossbite affects the back teeth on one or both sides. Some patients have both types at once.
Crossbites occur in children, teens, and adults. Many start in childhood and persist if not treated. According to the American Association of Orthodontists, early evaluation around age 7 helps catch crossbites before they affect jaw growth.[6]
Causes and Risk Factors
Crossbites usually develop from a mismatch between jaw size, tooth size, or jaw position. Both inherited traits and childhood habits play a role.
Genetic and Skeletal Causes
Many crossbites run in families. If parents have a narrow upper jaw or a forward-positioned lower jaw, children often inherit the same pattern.
Skeletal causes include a constricted maxilla, where the upper jaw is too narrow to fit over the lower teeth. A lower jaw that grows longer than the upper jaw can also create a front crossbite. These growth patterns are usually visible by age 6 or 7.
Dental and Habit-Related Causes
Some crossbites come from tooth position rather than jaw size. Common dental causes include:
- Prolonged thumb sucking or pacifier use past age 3
- Tongue thrusting that pushes teeth forward
- Early loss of baby teeth, which lets adjacent teeth drift
- Delayed eruption of permanent teeth
- Extra teeth or missing teeth that disrupt alignment
- Mouth breathing linked to enlarged adenoids or tonsils
Functional Shifts
Sometimes the upper and lower teeth meet incorrectly when closing, and the jaw shifts to one side to find a comfortable bite. This is called a functional crossbite. Over time, the shift can cause asymmetric jaw growth and facial changes if left untreated.
Symptoms and Diagnosis
Crossbites are usually diagnosed during a routine dental exam. Patients may notice their jaw shifts to one side, certain teeth look out of line, or chewing feels uneven.
Common symptoms include uneven tooth wear, jaw pain, clicking or popping in the temporomandibular joint, gum recession on tipped teeth, difficulty chewing, and speech changes. Children may complain that biting feels wrong on one side. Some patients develop facial asymmetry over time as the jaw grows around the shifted bite.
Crossbites have been associated with a higher risk of temporomandibular joint problems in some patients, though the relationship is complex and evidence is mixed.[1][5] Greene's review of TMD etiology notes that bite irregularities are one of several factors that may contribute, alongside trauma, stress, and joint structure.[5]
Diagnosis involves a clinical exam, dental impressions or digital scans, panoramic and cephalometric x-rays, and bite analysis. Orthodontists evaluate how the jaws line up at rest, during closing, and during chewing motion. Children should have their first orthodontic evaluation around age 7, when crossbites are easiest to identify and treat.[6]
Treatment Options
Treatment depends on the type of crossbite, the patient's age, and whether the cause is dental or skeletal. Most cases respond well to orthodontic treatment, though severe adult cases may need surgery.
Palatal Expanders
Palatal expanders widen a narrow upper jaw and are most effective in children before the palate fuses, typically around ages 8 to 14. The device attaches to the upper molars and is gradually widened with a small key.
Expansion takes 2 to 6 weeks of active turning, followed by 3 to 6 months of holding the expander in place to let new bone form. Most children adapt within a few days. Speech and eating return to normal quickly.
A 2014 Cochrane review of orthodontic interventions for posterior crossbite in children found that both quad-helix appliances and rapid maxillary expansion can correct posterior crossbite. Rapid maxillary expansion produced more skeletal change than removable expansion plates, but the review noted that evidence quality is limited and most included trials were small.[2]
Braces and Clear Aligners
Traditional braces and clear aligners can correct dental crossbites by moving individual teeth into proper position. Braces use brackets and wires for precise control. Clear aligners use a series of removable trays.
Both options work well for mild to moderate crossbites. Treatment typically takes 12 to 30 months. The orthodontist chooses based on the complexity of tooth movement, the patient's age, and lifestyle preferences. Working with the patient's general dentist throughout treatment helps reduce risks like root resorption and decay.[3][4]
Elastics and Functional Appliances
Cross-elastics, small rubber bands worn between upper and lower teeth, can pull individual teeth into position. Functional appliances guide jaw growth in growing children. These tools are often combined with braces or aligners.
Some research suggests early treatment in growing children can produce skeletal changes that are harder to achieve later, though final results often require a second phase of fixed appliances after the permanent teeth come in. The American Association of Orthodontists supports evaluation at age 7 to identify cases that benefit from this two-phase approach.[6]
Surgical Correction
Adults with severe skeletal crossbites may need orthognathic surgery combined with braces or aligners. Surgery repositions the upper jaw, lower jaw, or both. It is reserved for cases where tooth movement alone cannot correct the bite.
Surgical treatment typically spans 18 to 36 months including pre-surgical orthodontics, surgery, healing, and final tooth alignment. An oral and maxillofacial surgeon performs the procedure in coordination with the orthodontist.
Recovery and Aftercare
Recovery depends on the treatment used. Most patients return to normal eating and speaking within days of getting an appliance, with longer healing times after surgery.
After expander treatment, mild pressure or speech changes usually fade within a week. After braces or aligners, soreness lasts 2 to 4 days following each adjustment. After jaw surgery, swelling and limited jaw motion can last 4 to 8 weeks, with full healing around 6 to 12 months.
Retainers are essential after any crossbite correction. Without them, teeth tend to shift back toward their original position. Most orthodontists prescribe full-time retainer wear for several months, then nighttime wear long-term. Regular cleanings and check-ups protect the result.[4]
Patients should also continue seeing their general dentist every 6 months during and after treatment. Good home care, including brushing twice daily and flossing, prevents decay around brackets and on newly aligned teeth.
Cost Factors and Insurance
Crossbite treatment costs vary widely based on severity, treatment type, location, and provider. Costs vary by location, provider, and case complexity.
Typical price ranges include:
- Palatal expander: $1,500 to $3,500
- Traditional braces: $3,000 to $7,000
- Clear aligners: $3,500 to $8,000
- Two-phase treatment in children: $5,000 to $10,000
- Orthognathic surgery plus orthodontics: $20,000 to $60,000 or more
Insurance and Financing
Many dental insurance plans include orthodontic benefits with a lifetime maximum, often $1,000 to $3,000 per person. Some plans cover children only. Medical insurance may cover part of jaw surgery when it is medically necessary.
Most orthodontic offices offer payment plans that spread cost over the treatment period. Health savings accounts and flexible spending accounts can also help offset out-of-pocket costs.
When to See a Specialist
An orthodontist is the dental specialist trained to diagnose and treat crossbites. General dentists can identify the problem and refer patients but typically do not provide complex orthodontic treatment.
See an orthodontist when teeth visibly do not line up, the jaw shifts when closing, chewing feels one-sided, or a general dentist recommends evaluation. Children should have a first orthodontic visit by age 7 even without obvious symptoms.[6][7]
Adults benefit from specialist care because adult crossbites often involve both dental and skeletal components. An orthodontist coordinates with oral surgeons, periodontists, and general dentists when treatment crosses specialties. Team care reduces the risk of complications like root resorption and gum problems.[3][4]
Find an Orthodontist Near You
If you suspect a crossbite in yourself or your child, a board-certified orthodontist can confirm the diagnosis and outline treatment options. Visit the orthodontics page to find specialists in your area, compare credentials, and schedule a consultation.
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