Underbite – main symptoms and treatment options

An underbite can affect more than just the appearance of your smile — it may also impact speech, chewing efficiency, and overall oral health. Many people are unaware of the functional challenges it can cause until symptoms become more pronounced. Early diagnosis and timely treatment can greatly improve both aesthetics and dental function, leading to a healthier, more confident smile.

What is an underbite?

An underbite is a type of bite misalignment where the lower teeth extend beyond the upper teeth when the mouth is closed. This occurs when the lower jaw is positioned forward in relation to the upper jaw, which can be influenced by both dental and skeletal factors. The causes of underbite can include genetics, childhood habits, or irregular jaw growth, and in severe cases, it may require a combination of orthodontic treatment and jaw surgery for effective correction.

Types of Underbites

Underbites can vary in severity, and understanding the differences helps determine the right treatment approach.

1. Mild Underbite – lower teeth slightly overlap the upper front teeth; often easier to correct with orthodontic treatment.
2. Moderate Underbite – more noticeable misalignment where teeth and jaw positioning require a tailored treatment plan.
3. Severe Underbite – occurs when the lower teeth protrude far beyond the upper teeth, often needing jaw surgery in addition to braces for effective treatment.

Causes of underbite

Several factors contribute to the development of an under bite:

• vitamin D deficiency leading to weakening of bones during their growth;
• inappropriate position while sleeping or feeding;
• pathological cervical lordosis;
• long-term use of a pacifier;
• finger sucking;
• premature loss of primary lower incisors;
• hereditary bone development disorders;
• incorrect position of the tongue when the child’s mouth is constantly open.

How to recognize an underbite?

Symptoms of an underbite may vary depending on the patient’s age, and recognizing them early is key to starting effective underbite treatment.

1. Underbite in children – Signs can include lower front teeth overlapping the upper teeth, difficulties in chewing, changes in speech, and a noticeable underbite profile. In some cases, underbite development may be linked to hereditary factors or habits like thumb sucking.
2. Underbite in adults – Often presents as jaw discomfort, uneven tooth wear, and aesthetic concerns with the underbite profile. Untreated underbite can lead to functional problems, and surgery may be necessary in severe cases to correct an underbite and bring teeth into proper alignment.

What are the complications of an underbite?

An untreated underbite is a dental condition that can affect both function and health, often leading to long-term complications. Depending on the severity of the underbite, misaligned teeth and problems with the upper and lower jaw can trigger a range of issues that extend beyond appearance. Common complications include:

1. Temporomandibular joint (TMJ) disorders.
2. Dental problems.
3. Sleep apnea.
4. Increased risk of dental wear and tear due to misalignment.
5. Difficulty in speech.

How is an underbite diagnosed?

To diagnose an underbite, an orthodontist uses several methods to assess the bite, jaw position, and overall dental health. These steps help determine the severity of your underbite and guide the choice of effective treatment options:

1. Visual inspection of your bite and teeth positioning – allows the orthodontist to immediately recognize misalignment of the upper and lower teeth.
2. X-rays or Dental Scans to evaluate the position and growth of the jaws and teeth – provides a detailed view of bone structure and helps identify causes of an underbite.
3. Dental impressions to create models of your teeth for detailed analysis – enables precise planning for underbite correction and a customised treatment solution.

How can you prevent an underbite?

Taking preventive steps early in childhood can significantly reduce the risk of developing an underbite and the complications it may cause:

1. Weaning your child from the bottle starting at age 1.
2. Scheduling a dental visit by age 1.
3. Discouraging thumb-sucking after age 3.
4. Discouraging pacifier use after age 3.

Preventing an underbite is far easier than correcting the bite later and managing its potential complications.

Underbite Treatment Options

Treating an underbite involves selecting the most effective approach based on its severity, underlying causes, and the patient’s age. Modern dentistry and orthodontics offer a range of solutions designed to gradually shift teeth, correct jaw alignment, and restore a balanced bite for improved function and appearance.

Braces

Braces are orthodontic devices designed to gradually shift teeth into proper alignment, making them one of the most effective methods to correct an underbite.

Pros:

• Proven and widely used.
• Can correct other issues (crowding, gaps) simultaneously.

Cons:

• May take 12-30 months.
• Regular adjustment appointments are required.

Clear Aligners

Clear aligners are transparent, removable orthodontic trays custom-made to gradually shift teeth into proper alignment and correct the underbite without the visibility of traditional braces.

Pros:

• Nearly invisible.
• Removable for eating and brushing.
• Comfortable and custom-fit.

Cons:

• Less effective for complex cases.
• Requires strict patient compliance.

Palatal Expanders

Palatal expanders are orthodontic devices designed to widen the upper jaw, creating space for teeth to align correctly and help correct an underbite before permanent teeth are fully developed.

Pros:

• Non-surgical.
• Can prevent the need for future surgery.

Cons:

• Best used before puberty.
• May cause temporary discomfort or speech changes.

Orthognathic (Jaw) Surgery

Orthognathic (Jaw) Surgery is a treatment method used to fix an underbite in severe cases of underbite, especially when underbite occurs due to skeletal misalignment or underbite teeth are significantly displaced, and non-surgical approaches cannot correct the underbite.

Pros:

• Permanent correction of underbite.
• Can improve facial profile and sleep quality.

Cons:

• Invasive and requires recovery time.
• Usually recommended after skeletal maturity.

Reverse-Pull Headgear (Facemask Therapy)

Reverse-Pull Headgear (Facemask Therapy) is a non-surgical orthodontic treatment used to correct an underbite, especially when underbite starts in childhood and the lower teeth overlapping the upper indicate skeletal imbalance. It is most effective during early underbite development before skeletal maturity.

Pros:

• Non-surgical.
• Encourages balanced facial growth.

Cons:

• Must be worn consistently (12-14 hours daily).
• Can be bulky or uncomfortable.

Treatment options for underbite is highly individual and is selected based on the severity of the underbite, the patient’s age, and results from a thorough dental and orthodontic examination. After an underbite during a routine examination is assessed, the orthodontist diagnoses underbite type and considers whether mild underbite may be managed with braces or aligners, while severe underbite can lead to the need for jaw surgery.

It’s also important to understand what causes a underbite and the development of an underbite over time, as ignoring an underbite may result in complications. Treatment options depend on the underbite – whether underbite is severe or manageable – and addressing an underbite early often improves treatment outcomes and overall dental health. 

Underbite – Conclusion

Early recognition of underbite – symptoms and understanding underbite causes is key to effective care, as untreated cases can result in an underbite or other long-term effects of underbite. Timely treatment for underbite, especially in underbite in childhood, increases the chances of success. With treatment options available, both severe underbite cases and those where it is possible to manageable the treatment can be addressed, helping patients correct your underbite and improve oral function.

FAQ

• What’s the difference between an underbite and an overbite?

  An underbite occurs when the lower teeth extend past the upper teeth, while an overbite is the opposite alignment, creating an overbite vs underbite scenario.

• Is an underbite serious?

  Yes, underbite is one condition that can affect chewing, speech, and jaw health if left untreated.

• At what age should underbite treatment begin?

  Underbite may start developing in childhood, and early intervention is recommended for the best treatment outcomes.

• Can underbites correct themselves as a child grows?

  Underbite can be treated, but spontaneous correction is uncommon; professional monitoring is usually needed.

• How long does underbite treatment usually take?

  Treatment may vary depending on severity, ranging from months to several years using braces, aligners, or other methods.

• Is underbite treatment painful?

  Discomfort is normal, especially after adjustments, but proper care ensures manageable treatment without excessive pain.

• Can underbites cause speech issues?

  Yes, symptoms of underbite can include difficulty pronouncing certain sounds due to misaligned teeth.

• Do underbites get worse with age?

  If ignored, causes of underbites can worsen over time, potentially requiring more complex interventions such as jaw surgery may be necessary.

Author of the article

, Orthodontist

Tetiana Pererva

📋 Link copied ✅

Copy link

• 
• 
•