Can Invisalign Fix an Overbite, Underbite or Crowding?

Can Invisalign Fix an Overbite, Underbite or Crowding?

The short answer is yes — Invisalign can correct overbites, underbites, crossbites, crowding, gaps, and open bites in the majority of cases. However, the more useful answer depends on the severity of your specific condition and the type of movement required. Not every orthodontic problem can be solved with clear aligners alone, and understanding these boundaries will help you set realistic expectations before starting treatment.

At Townsville Dental Clinic, we assess each patient’s orthodontic needs with digital 3D scanning and ClinCheck treatment planning to determine whether Invisalign is the right solution — or whether an alternative orthodontic approach would deliver a better result.

Conditions Invisalign Can Treat

Crowding

Crowding occurs when there is insufficient space in the dental arch for all teeth to align properly, causing teeth to overlap, twist, or sit behind neighbouring teeth.

How Invisalign corrects it: Invisalign creates space through three primary mechanisms:

1. Arch expansion — widening the dental arch to accommodate all teeth
2. Interproximal reduction (IPR) — controlled removal of 0.1 to 0.5 millimetres of enamel between specific teeth to create space without extractions
3. Proclination — controlled forward tilting of the front teeth where appropriate

Crowding is the most commonly treated condition with Invisalign. A 2020 Align Technology clinical report indicated that approximately 65 per cent of all Invisalign cases involve some degree of crowding as the primary complaint.

Overbite (Deep Bite)

An overbite means the upper front teeth overlap the lower front teeth vertically by more than the normal 2 to 3 millimetres. In severe cases, the lower teeth may bite into the gum tissue behind the upper teeth.

How Invisalign corrects it: Invisalign uses bite ramps — precision-engineered raised surfaces built into the back of the upper aligners behind the front teeth. When you bite down, these ramps prevent the upper and lower front teeth from over-closing, encouraging intrusion of the front teeth and slight eruption of the back teeth. This gradually levels the bite plane.

In addition, precision-cut attachments on the front teeth provide the grip needed for controlled intrusion, while elastics may be used to support posterior eruption.

A 2021 study in the Journal of Clinical Orthodontics found that Invisalign with bite ramps achieved clinically acceptable overbite correction (reducing overlap to less than 3 millimetres) in 85 per cent of cases with initial overbites of 4 to 6 millimetres.

Underbite

An underbite occurs when the lower front teeth sit in front of the upper front teeth. Underbites can be dental (caused by tooth position) or skeletal (caused by the lower jaw being larger or more forward than the upper jaw).

How Invisalign corrects it: For dental underbites, Invisalign uses Class III elastics — small rubber bands that hook between the upper and lower aligners via precision-cut attachment points. These elastics apply a continuous forward force on the upper arch and a backward force on the lower arch, gradually correcting the anterior relationship.

Skeletal underbites where the mandible is significantly protruding relative to the maxilla require surgical intervention (orthognathic surgery) to reposition the jaw, followed by orthodontic treatment to align the teeth. Invisalign can be used for the orthodontic phase in some surgical cases.

Crossbite

A crossbite occurs when one or more upper teeth bite inside the lower teeth instead of outside. Crossbites can be anterior (affecting the front teeth) or posterior (affecting the back teeth), and can involve a single tooth or multiple teeth.

How Invisalign corrects it: Invisalign applies controlled lateral forces to tip the affected teeth into their correct position. For posterior crossbites, the aligner can expand the upper arch to widen it over the lower arch. Attachments provide the necessary grip for predictable movement.

Gaps and Spacing

Gaps (diastemas) between teeth can occur due to small teeth relative to the jaw size, missing teeth, or habits such as tongue thrusting.

How Invisalign corrects it: Invisalign sequentially closes gaps by moving teeth together. Attachments help control the direction and tipping of tooth movement to ensure gaps close evenly and roots move with the crowns.

Open Bite

An open bite occurs when the upper and lower front teeth do not overlap vertically — there is a visible gap between them even when the back teeth are biting together. Open bites can be dental (caused by habits or tooth eruption patterns) or skeletal.

How Invisalign corrects it: Invisalign corrects dental open bites by intruding the posterior teeth (pushing them up into the bone) and/or extruding the anterior teeth (pulling them down). Posterior intrusion is one of the more challenging movements for clear aligners, and Invisalign uses heavy attachments and optimised force systems to achieve it.

A 2019 study in the Angle Orthodontist found that Invisalign achieved successful open bite closure (less than 1 millimetre residual opening) in 72 per cent of mild to moderate cases, with the remaining cases requiring fixed appliances to complete treatment.

How Attachments and Elastics Work

Modern Invisalign treatment bears little resemblance to the flat, attachment-free aligners of the early 2000s. Two key innovations — attachments and elastics — have dramatically expanded the range of treatable conditions.

Attachments

Attachments are small tooth-coloured composite bumps bonded directly to the tooth surface. They come in various shapes (rectangular, bevelled, ellipsoid, optimised) designed to produce specific types of force when the aligner engages with them.

• Rotation attachments grip round teeth (such as premolars and canines) to rotate them into alignment
• Extrusion attachments help pull teeth downward into the bite
• Root torque attachments control the angle of the root relative to the crown
• Power ridges are built into the aligner itself to apply specific forces on the front teeth

Most adult Invisalign cases require attachments on 8 to 14 teeth. They are virtually invisible and are removed without damage to the enamel at the end of treatment.

Elastics

Invisalign aligners can now incorporate precision-cut hooks or buttons that serve as anchor points for elastic bands. These elastics work identically to the rubber bands used with traditional braces, applying inter-arch forces to correct bite discrepancies.

• Class II elastics (upper front to lower back) correct overbites
• Class III elastics (lower front to upper back) correct underbites
• Cross elastics correct crossbites

Elastic wear is typically prescribed for 12 to 22 hours per day and is one of the most critical compliance factors for bite correction cases.

When Invisalign Is Not Enough

While Invisalign capabilities continue to expand, there are scenarios where traditional braces or combined treatment approaches remain superior.

Fixed Braces May Be Better For:

• Severe rotations (>20 degrees) — particularly on round premolar teeth where aligner grip is limited
• Significant vertical movement — pure intrusion or extrusion beyond 2 to 3 millimetres
• Extraction cases with large spaces to close — braces provide more controlled bodily movement over long distances
• Severe skeletal discrepancies — jaw size mismatches that require surgical correction
• Non-compliant patients — braces work 24/7 regardless of patient cooperation

For a comprehensive comparison of the two systems, see our Invisalign vs braces guide.

Combination Approaches

In some cases, your dentist may recommend starting with braces for the most complex movements and transitioning to Invisalign for the finishing stages, or vice versa. This hybrid approach leverages the strengths of each system.

Treatment Time by Condition

The following table summarises typical Invisalign treatment durations by condition. These assume Invisalign Comprehensive with full compliance (22 hours daily wear).

For a detailed breakdown of factors that influence treatment duration, see our guide on how long Invisalign takes.

What Happens During Your Assessment

At Townsville Dental Clinic, your initial Invisalign consultation includes:

1. Clinical examination — assessing tooth positions, bite relationship, gum health, and any existing dental work
2. Digital 3D scan — an iTero intraoral scanner captures a precise digital model of your teeth in minutes, with no messy impressions
3. Radiographic assessment — panoramic and/or cephalometric X-rays to evaluate root positions, bone levels, and jaw relationship
4. ClinCheck simulation — Invisalign’s proprietary software generates a 3D animation showing exactly how your teeth will move from start to finish
5. Treatment plan discussion — your dentist explains whether Invisalign is appropriate, what attachments and elastics will be needed, the estimated number of aligners, the expected timeline, and the cost

This assessment gives you complete clarity on what Invisalign can and cannot achieve for your specific case before you commit to treatment.

Adults with Bite Issues: It Is Not Too Late

If you are an adult considering Invisalign for a bite issue you have lived with for years, know that orthodontic treatment is effective at any age. Many adults assume their overbite or crowding is “just how their teeth are” and cannot be changed. In reality, modern clear aligner technology can correct the vast majority of adult orthodontic issues with minimal disruption to daily life.

For patients considering whether orthodontic correction might be combined with other dental treatments, our guide on dental implant candidacy explains how orthodontic alignment can improve outcomes for future implant placement.

Book Your Invisalign Assessment in Townsville

The only way to know for certain whether Invisalign can fix your overbite, underbite, or crowding is a clinical assessment with digital scanning. At Townsville Dental Clinic, your Invisalign consultation includes a full clinical evaluation, 3D scan, and ClinCheck treatment simulation so you can see your projected result before starting treatment.

Ready to find out if Invisalign can fix your bite? Book your consultation at Townsville Dental Clinic today.