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Types of Underbite: Causes, Severity & Best Treatment Options

Types of Underbite

Key Takeaways

  • Underbite is medically known as Class III malocclusion. It happens when the lower front teeth sit in front of the upper front teeth. It ranges from mild to severe based on jaw and tooth alignment.
  • There are two main categories: dental underbite (tooth position issue) and skeletal underbite (jawbone imbalance), with skeletal underbite typically needing more complex care.
  • Severity (mild/moderate/severe) helps decide whether you need braces, growth modification, or surgery.
  • Early diagnosis (often ages 7-10) improves treatment outcomes and can reduce the need for invasive procedures later.
  • A personalized plan from an orthodontic specialist, like the team at Brite Orthodontics in New York and Maryland, helps match your underbite type and timing to the right treatment pathway.

Is my underbite dental or skeletal, and does that mean braces, aligners, or surgery? The type of underbite matters more than most people think, especially when treatment starts early. That’s why so many orthodontic plans begin before adulthood. In fact, 67.6% of orthodontic revenue comes from patients under 18, when jaw growth can still be guided.

What often confuses is whether the problem is with the teeth or the jaw. Some underbites are dental, while others are skeletal underbite cases linked to jaw growth. Severity also varies, from mild bite issues to a severe underbite, and that difference helps orthodontists choose the right treatment.

This guide explains different types of underbite and how Brite Orthodontics helps patients move forward with clarity and confidence.

What Is an Underbite (Class III Malocclusion)?

An underbite happens when your lower front teeth extend past your upper front teeth, disrupting normal biting and chewing patterns. Clinically, this fits under Class III malocclusion, a specific alignment category orthodontists use to describe how your upper and lower jaws and teeth meet.

Class III vs other bite problems

In bite terminology, different bite problems are described like this:

  • Overbite: Upper front teeth overlap the lower ones.
  • Crossbite: Upper teeth sit inside lower teeth in places.
  • Underbite (Class III): Lower teeth extend beyond upper teeth.

Classifications matter because they point to different causes and treatment needs, especially the difference between dental and skeletal origins.

Different Types of Underbite (by Cause and Severity)

Understanding the types of underbite helps your orthodontist tailor the most effective plan.

By Cause

Dental underbite (Tooth Alignment Issue)

  • In a dental underbite, the jaws themselves are in proper alignment, but tooth positions cause the bite mismatch.
  • This is often easier to treat with orthodontic appliances that move teeth only, not bones.

Skeletal Underbite (Jaw Discrepancy)

  • A true skeletal underbite comes from a mismatch in jaw size or growth, such as a more prominent lower jaw or a retrusive upper jaw.
  • This type tends to be more pronounced and may require growth guidance or surgical correction in adults.
Underbite Type Cause/Origin Characteristics Typical Treatment
Dental underbite Tooth positioning, normal jaws Lower teeth overlap due to tooth angles Braces or clear aligners
Skeletal underbite Jawbone size or growth discrepancy Lower jaw forward; concave profile Growth modification or surgery

By Severity

Underbites can also be described by how pronounced they are:

Mild Underbite

  • Slight overlap of lower teeth over the upper.
  • Usually, orthodontic options like braces or aligners can correct this.

Moderate Underbite

  • Noticeable misalignment.
  • Often treated with braces and sometimes additional appliances.

Severe Underbite

  • Clear jaw prominence or a pronounced lower jaw profile.
  • May need jaw surgery in adulthood, combined with orthodontics.
Severity Level Visual & Functional Signs Common Treatment Options
Mild Slight overlap; little to no discomfort or functional issues Clear aligners or braces
Moderate Noticeable overlap; possible chewing or speech difficulty Braces, sometimes with bite-correcting appliances
Severe Significant jaw misalignment; visible facial profile changes Orthodontic treatment combined with jaw surgery

Diagnosis and Best Timing for Treatment

Treating an underbite starts with finding out whether the problem is with the teeth, the jaw, or both. Timing matters because early care can reduce how complex treatment becomes later.

  1. Clinical Exam, X-Rays, Scans, and Bite Analysis

    Orthodontists diagnose underbites using a clinical exam along with X-rays and digital scans. These tools show how the teeth fit together and whether jaw growth is involved. This step helps determine whether the case involves a dental or skeletal underbite.

  2. Early Interceptive Window (ages 7-10)

    An orthodontic check between the age of 7 and 10 can be constructive. Treating underbites during growth may guide jaw development and lower the chance of needing surgery later.

  3. Adult Pathway Planning

    For adults, treatment depends on severity. Mild cases may be corrected with braces or aligners, while a severe underbite caused by jaw structure often requires orthodontics combined with a surgical consultation for long-term results.

Treatment Options by Case Severity

Overbite treatment isn’t one-size-fits-all. The right approach depends on how severe the bite issue is, how your teeth and jaw align, and whether it affects daily comfort or function. The section below outlines common treatment options based on case severity, helping you understand what care may look like at each stage.

  • Palatal Expander

    This device is useful in younger patients to widen the upper jaw and improve alignment before orthodontics.

  • Reverse-Pull Facemask (Headgear)

    A device that gently pulls the upper jaw forward in patients of growing age. It helps correct skeletal discrepancies.

  • Braces

    Traditional metal or ceramic braces can treat dental underbites and mild skeletal cases by guiding teeth into better positions.

  • Clear Aligners

    Clear aligners like Invisalign can be effective for mild underbites and specific dental cases, with treatment duration typically around 12-18 months.

  • Tooth Extraction (Camouflage)

    Extraction of a tooth is required in select adult cases to help accommodate space and improve bite alignment without surgery.

  • Orthognathic Surgery

    For severe underbite or a skeletal imbalance, orthognathic (jaw) surgery repositions the bones to establish proper function and facial harmony.

Option Best For Typical Age Invasiveness
Palatal Expander Growing with maxillary deficiency 7-12 Low
Reverse-Pull Facemask Skeletal Class III in growth 7-10 Low to moderate
Braces Mild–moderate dental or skeletal Teens/Adults Low to Moderate
Clear Aligners Mild dental underbite Teens/Adults Low
Tooth Extraction Adult camouflage Adults Moderate
Orthognathic Surgery Severe skeletal underbite Adults High

Brite Orthodontics Care Pathway

At Brite Orthodontics, your underbite treatment starts with a personalized diagnosis using advanced imaging and bite analysis. We work with families in New York and Maryland to determine whether your underbite is dental or skeletal and create a step-by-step plan that fits your age, goals, and comfort.

Your care may include:

  • Digital scans and comprehensive bite evaluation
  • Growth-guided appliances for younger patients
  • Braces, aligners, or combined approaches
  • Surgical coordination when necessary
  • Insurance guidance and flexible scheduling

Ready to understand your underbite type and start a tailored treatment plan?

Book a free consultation with Brite Orthodontics at your nearest New York or Maryland location today.

FAQs

Yes. The main type of underbite is either dental (tooth position issue) or skeletal (jaw structure issue). Each type needs a different treatment approach.

Underbites are seen across all ethnicities, but studies show they are more common in East Asian populations due to genetic jaw growth patterns.

Often, yes. A skeletal underbite is commonly inherited, though habits and tooth positioning can also play a role.

A dental underbite involves misaligned teeth with a normal jaw structure. A skeletal underbite happens when the lower jaw grows too far forward, or the upper jaw doesn’t grow enough.

Clear aligners can help with mild dental underbites. They are usually not effective for moderate to severe skeletal cases.

Not always, but a severe underbite caused by jaw structure often requires a combination of orthodontics and jaw surgery for stable results.

An orthodontic evaluation around ages 7 to 10 is ideal. Early treatment can guide jaw growth and may reduce the need for surgery later.

Treatment time varies. Mild cases may take 9-18 months, while complex cases involving jaw correction can take 2-3 years, including surgery.

Yes, braces can correct many adult underbites, especially dental ones. Skeletal cases may need additional treatment planning.

Most kids feel pressure rather than pain. Any discomfort is usually mild and short-lived.

After surgery, patients wear braces to fine-tune the bite. Swelling is temporary, and most people return to normal routines within a few weeks.

For mild cases, clear aligners or braces with elastics are often the quickest and least invasive option.

Yes. An untreated underbite can strain the jaw joints and muscles, sometimes leading to TMJ discomfort.

In some cases, yes. Jaw position can affect airway space, especially with a severe skeletal underbite.

Some adults choose camouflage treatments, but true severe underbite cases caused by jaw structure are usually best corrected with surgery.

Yes. When used during growth, expanders can improve jaw balance and reduce future treatment complexity.

In select cases, tooth extractions may help improve bite appearance, but they don’t correct jaw position.

Elastics usually show improvement within a few months, but full correction depends on consistency and case severity.

They can. Some people notice speech changes, especially with certain sounds, which often improve after correction.

In some cases, yes. Correcting jaw position or bite alignment can improve facial balance, especially in skeletal underbite treatment.

Picture of Dr. Nimesh Patel

Dr. Nimesh Patel

Dr. Patel is an orthodontist and maintains a private practice in Rome, NY. He completed his undergraduate education at the Ohio State University. Then, he earned his Doctorate in Dental Medicine from the University of Pennsylvania School of Dental Medicine in Philadelphia. After earning his doctorate, Dr. Patel attended a three-year, dual-degree residency at Columbia University in New York City. Here, he earned his certificate in Orthodontics and Dentofacial Orthopedics as well as earning a Masters in Oral Biology. During his time off, Dr. Patel likes to stay active by jogging, biking, and hiking.
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