Bite Problems: Types, Causes and How They're Corrected

Key takeaways

• A malocclusion is any departure from a healthy bite, crowding included, and it can affect chewing, cleaning, tooth wear and the jaw joints.
• Whether a bite problem lies in the teeth or in the jaws decides how it is treated.
• Growth appliances only work while a child is still growing, which is why an early orthodontic check is recommended.
• Adults can correct most tooth-based bite problems with aligners or braces; jaw-based (skeletal) problems sometimes need surgery as well.

What a 'bad bite' (malocclusion) is, crowding included, and why it matters beyond looks

In a healthy bite the upper teeth sit slightly outside and in front of the lower teeth, the back teeth interlock evenly and the front teeth overlap a little. At a routine examination a dentist looks at occlusion (how the teeth meet when you close), articulation (how they glide against each other as the jaw moves) and the contact points where teeth touch. A tooth that meets too early or too hard takes excess force and, over time, may chip or crack, or wear out a filling or crown, so checking and adjusting the bite helps protect teeth and restorations.

Crowding is a space problem: there is not enough room in the jaw for the teeth to line up. It is often inherited, with a relatively small jaw paired with normal-sized teeth. Losing baby teeth early can let neighbouring teeth drift into the gap and block the adult teeth, and crowding can also develop gradually in adults. Crowded teeth are harder to clean, and crowding is one of the most common reasons people seek orthodontic treatment.

The American Dental Association notes that a good bite makes biting, chewing and speaking easier. A poor bite can wear teeth unevenly, make cleaning difficult and, in some people, strain the jaw muscles and joints; jaw pain has many causes, covered in TMJ pain: causes and treatments.

Crossbite: upper teeth biting inside the lower

A crossbite is when upper teeth bite inside the lower teeth instead of outside them, on one tooth or a whole side. A narrow upper jaw is a common cause, though tooth position, early loss of baby teeth and thumb-sucking also contribute. Left untreated, it can cause uneven wear, strain on the jaw joints and sometimes speech changes. In a growing child the jaw may shift sideways to close, which in severe cases leads to facial asymmetry.

Treatment depends on severity:

• Mild crossbites involving one or two teeth can often be corrected with clear aligners or a short course of braces.
• Moderate cases usually need comprehensive braces or aligners.
• Skeletal crossbites, typically from a narrow upper jaw, are treated in children with a palatal expander followed by braces or aligners. In adults, surgery combined with orthodontics is sometimes considered.

Crossbites are generally easier to correct between about 7 and 10, while the jaw is still developing, and teenagers can often still be treated without surgery.

Deep bite: excessive vertical overlap

Overbite is the vertical overlap of the upper front teeth over the lower ones. Some overlap is normal. When it is excessive, often described as the upper teeth covering more than about a third of the lower front teeth, or more than about 3 mm, it is called a deep bite; when there is no overlap at all, the bite is open. Overbite is often confused with overjet, which measures the horizontal gap.

Left alone, a deep bite can wear the lower front teeth against the palate, chip the upper edges and stress the jaw joints. Many cases can be managed with clear aligners that include bite ramps: small raised stops that the lower front teeth meet first, propping the back teeth slightly apart while the bite is levelled. Fixed braces do the same job with bite turbos, small blocks bonded to the teeth. Either route is usually a comprehensive course of treatment, typically 12–24 months with aligners or 18–30 months with braces.

Open bite: front teeth that never meet

In an open bite the front teeth do not meet when the back teeth are together, leaving a visible gap that can make biting into food awkward and affect speech. The usual causes are prolonged thumb-sucking or dummy use, a tongue-thrust habit, a skeletal jaw discrepancy, or relapse after earlier treatment.

Treatment starts with the habit, because while it continues the bite tends to reopen and any correction relapses. Orthodontic treatment follows: aligners with elastics for mild cases, braces for moderate ones, and jaw surgery combined with orthodontics for severe skeletal cases once growth has finished. In children, treatment often takes around 12–18 months including habit correction; mild adult cases often take about 12 months, and skeletal cases 18–24 months of orthodontics around surgery.

Overjet and underbite (Class II and Class III)

Overjet is the horizontal distance between the upper and lower front teeth. A small overjet of around 2 mm is normal. A large overjet, often called buck teeth, usually belongs to a Class II bite, where the lower jaw sits back or the upper front teeth are tipped forward. Prominent front teeth are more easily damaged in falls and knocks.

An underbite is a Class III bite, where the lower front teeth sit ahead of the upper ones. It can come from an underdeveloped upper jaw, a large lower jaw, tipped teeth or a mixture, and often runs in families.

For both, the key question is whether the cause lies in the teeth or the jaws. Tooth-based problems respond to braces or aligners; jaw-based problems are improved with growth appliances in children and, in adults, with orthodontics alone or combined with jaw surgery.

Growth appliances for children: palatal expander, reverse-pull face mask, headgear

These appliances use a child's growth to change how the jaws develop, so they only work before the bones mature, and only when worn as prescribed.

Palatal expander

A palatal expander widens a narrow upper jaw while the suture in the middle of the palate is still open, which makes roughly ages 7–11 the ideal window. A small screw is turned daily at home for a few weeks, then the appliance stays in for several months to hold the new width. Braces or aligners usually follow.

Reverse-pull face mask

A reverse-pull face mask treats a skeletal underbite by gently pulling the upper jaw forward. The usual window is about ages 7–11, it is commonly worn 12–16 hours a day (mostly evenings and overnight), and it is usually combined with a palatal expander.

Headgear

Headgear applies force from outside the mouth to hold back or guide upper-jaw growth in Class II cases. It is usually worn for set hours, mostly at night. It is far less common now that functional appliances and other mechanics exist, but in some growing patients it is still the appropriate option.

When to treat: the age-7 orthodontic check and interceptive treatment

The American Association of Orthodontists recommends that children have an orthodontic screening at age 7, when the first adult molars and incisors have usually come through and crossbites, crowding, habits and jaw-growth problems can be spotted.

Most children do not need treatment at that first check; the visit is about detection and timing. Where a jaw-growth problem is found, interceptive (Phase 1) treatment is usually done between about 7 and 10. Comprehensive treatment typically starts between 11 and 13, once most adult teeth are in, and some children need a second phase after growth. What happens at an assessment is described in your first orthodontic consultation.

Adult bite correction: aligners with elastics, braces, and when surgery is involved

Adults have finished growing, so correction comes from moving teeth, and most tooth-based bite problems can still be corrected. Prominent upper front teeth are a common example: mild to moderate cases are often treated with clear aligners such as Invisalign, using elastics to adjust how the teeth meet, while more severe cases may need fixed braces. Veneers change how the front teeth look but do not correct the bite.

Where the jaws themselves are significantly mismatched, orthodontics may be combined with jaw (orthognathic) surgery, which is carried out in hospital by a surgical team, with the orthodontic treatment planned around it. Combined approaches are common, and a consultation determines which option fits; can adults get braces? covers what to expect. All five dentists at Paradise Dental Clinic are Invisalign Certified Providers, and the options are described on the Invisalign and braces service pages.

Typical timelines and cost ranges by problem and age

The approach and timeline depend on the problem, its severity and whether growth can help:

Bite correction usually involves both arches, so it tends to fall into the comprehensive ranges. Typical ranges from the pricing page:

There is no standard figure for expanders, face masks or headgear, which depend on the appliance and the case, and jaw surgery is priced by the surgical team and hospital. What changes an Invisalign quote is explained on the Invisalign cost page.

Practical decision guide

Orthodontics works by controlled tooth movement over time. The best plan balances alignment, bite correction, gum safety, compliance, and lifelong retention rather than chasing the shortest timeline.

Check this first

• Bite classification, crowding, gum thickness, jaw growth, wisdom teeth, and any history of relapse.
• Whether aligners, braces, expanders, elastics, or a combined cosmetic plan is most predictable.
• The retention plan after treatment, because teeth continue to move throughout life.

When to book sooner

• A child has crossbite, severe crowding, mouth-breathing habits, thumb sucking, trauma risk, or jaw asymmetry.
• Aligners are not tracking, attachments are lost, elastics are not being worn, or teeth feel unusually mobile.
• You are considering direct-to-consumer aligners without in-person periodontal and x-ray assessment.

Topic-specific notes

• For children, prevention depends on age-appropriate fluoride, supervised brushing, sugar-frequency control, sealants when indicated, and early visits that make dental care normal rather than frightening.

Questions to ask at the appointment

• What is the real treatment goal: cosmetic alignment, bite correction, or both?
• How many refinement stages are included, and what happens if teeth do not track?
• Will I need fixed, removable, or combined retainers after treatment?

Dubai patient note

For Dubai orthodontic treatment, ask whether the provider is DHA-licensed as an orthodontist or is a general dentist providing aligners, and confirm what is included in the quoted fee.