Many people use the terms “overjet” and “overbite” as if they mean the same thing, but in fact they describe two different bite issues. Both relate to how the upper and lower front teeth are positioned, yet each affects the smile and bite in its own way.
Understanding the difference helps you recognise what is happening with your teeth and why certain treatments may be recommended. As a trusted orthodontist on the Gold Coast, the team at Gullotta Orthodontics provides clear guidance and personalised care to diagnose these concerns accurately and recommend the most effective treatment for your needs.
What Is an Overbite?
An overbite refers to the vertical overlap of the upper front teeth over the lower front teeth. A small amount of overlap is normal, but when the upper teeth cover too much of the lower teeth, it is known as an excessive overbite or deep bite.
Signs of an excessive overbite can include:
- Lower front teeth being partially or fully hidden when you bite down
- Wear on the edges of the lower front teeth
- Difficulty biting into certain foods
- Jaw discomfort in some cases
Several factors can contribute to an overbite, including genetics, the position of the teeth, jaw growth patterns, thumb sucking, or prolonged dummy use during childhood.
If left untreated, an overbite can cause long-term issues such as enamel erosion, speech difficulties, and an increased risk of damage to the lower front teeth.
Learn more on our Overbite page.
What Is an Overjet?
An overjet refers to the horizontal distance between the upper and lower front teeth. In a normal bite, the upper teeth sit slightly ahead of the lower teeth. When this distance is larger than it should be, it is called an excessive overjet.
Common signs of an excessive overjet include:
- Upper front teeth that appear to protrude forward
- Difficulty closing the lips comfortably, leading to lip strain
- Speech concerns in some cases, such as a slight lisp
- Higher risk of accidental damage to the front teeth
Overjets can develop for several reasons, including thumb sucking, tongue thrusting, jaw growth patterns, or alignment issues that affect how the teeth meet.
Unlike overbite, overjet is often more noticeable from a side profile because the upper teeth push forward past the lower teeth. It can affect speech and chewing, and increases the risk of trauma to the front teeth, especially during falls or contact sports.
Learn more on our overjet page.
Key Differences: Overbite vs Overjet
| Attribute | Overbite | Underbite |
| Feature | Overbite | Overjet |
| Measurement Direction | Vertical overlap of upper front teeth over lower front teeth | Horizontal distance between upper and lower front teeth |
| What It Looks Like | Upper teeth cover more of the lower teeth than normal | Upper front teeth sit noticeably forward |
| Typical Causes | Genetics, jaw growth patterns, habits (thumb sucking/dummy use), tooth position | Thumb sucking, tongue thrusting, jaw growth differences, protruding upper teeth |
| Common Concerns | Lower teeth become hidden, wear on lower front teeth, deep bite issues | Protruding teeth, difficulty closing lips, speech concerns, higher risk of injury |
| When Treatment Is Recommended | When overlap is excessive, causing wear, discomfort, or cosmetic concerns | When protrusion affects function, comfort, appearance, or safety |
Can You Have Both an Overbite and an Overjet?
Yes, it is very common to have both an overbite and an overjet at the same time. Although they describe different types of measurements, the same underlying factors can influence both the vertical and horizontal position of the front teeth.
For example, habits such as thumb sucking, certain tongue patterns, or jaw growth differences can affect how the teeth meet in multiple directions. Genetics can also play a role in how the upper and lower jaws develop, making combined concerns more likely.
During an orthodontic assessment, each issue is measured separately using clinical photographs, digital scans, and a detailed bite evaluation. This helps your orthodontist understand the exact position of the teeth and jaws so they can create a treatment plan that addresses both problems effectively and supports long-term function and comfort.
Treatments to Fix Overbite and Overjet
Both overbite and overjet can be treated with a range of orthodontic solutions, depending on the severity of the issue and the patient’s age. Many treatments work effectively for both conditions, while some are more targeted to specific bite types.
Braces
Braces are highly effective for treating both overbite and overjet.
LightForce Braces: These 3D-printed braces are custom made for each tooth, offering precise and efficient treatment, especially useful for correcting overbite with comfort and accuracy.
Damon metal braces: Use self-ligating brackets to reduce friction, especially helpful for deep vertical overlap.
Clear braces: Offer a more discreet option with similar effectiveness.
Clear Aligners
Clear aligners like Invisalign and Spark are suitable for mild cases of both overbite and overjet. They’re removable, nearly invisible, and custom-designed to move teeth gradually and precisely.
Jaw Surgery
In cases where overjet is caused by severe jaw misalignment, surgical intervention may be required to reposition the upper or lower jaw. This is typically recommended when orthodontic appliances alone can’t correct the bite.
Other Orthodontic Appliances
For younger patients, appliances like expanders or headgear may be used to guide jaw growth and reduce the severity of overbite or overjet before braces or aligners are introduced.
When to See an Orthodontist
If you’re unsure whether an overbite or overjet needs treatment, a consultation can give you clarity. It may be time to book an assessment if you notice:
- Upper teeth sitting noticeably ahead of the lower teeth
- Lower front teeth being hidden when you bite down
- Difficulty closing your lips comfortably
- Speech concerns, such as a lisp
- Uneven wear on the front teeth
- Discomfort when biting or chewing
Orthodontic assessments are suitable for children, teens, and adults. Early evaluations for children can help identify issues before they become more complex.
Ready to Take the Next Step?
A consultation is the best way to get clear answers and a personalised treatment plan. Whether you’re considering braces, aligners, or simply want to understand what’s happening with your bite, we’re here to help.
Book your consultation today and let our team help you achieve a healthier, more comfortable smile.
