Summary: An overbite is how far the upper front teeth cover the lower ones vertically. An overjet is how far they sit forward horizontally, which is what most people mean by buck teeth. Correction depends on whether the cause is dental or skeletal, and on whether growth is still available to work with.
What this article covers
- Overbite vs. overjet: what the terms actually mean
- What causes an overbite
- Why an overbite matters beyond appearance
- How overbite is corrected at different ages
- Where the airway fits in
- Frequently asked questions
Most people searching for overbite correction are not describing an overbite. They are describing upper front teeth that stick out, which is a different measurement with a different name and often a different cause.
That distinction is worth five minutes of your time, because it changes what treatment is appropriate and how long it takes. This guide separates the two terms, covers what actually causes each one, explains why a bite problem matters beyond how it photographs, and walks through how correction differs depending on whether growth is still on the table.
Overbite vs. overjet: what the terms actually mean
Overbite is vertical. It measures how much the upper front teeth overlap the lower front teeth when the back teeth are together. Some overlap is normal and desirable. When the upper teeth cover most or all of the lower ones, that is a deep bite.
Overjet is horizontal. It measures how far forward the upper front teeth sit relative to the lower ones. This is what people mean when they say buck teeth or protruding teeth, and it is the one most often photographed and worried about.
The two can occur together or independently. You can have a deep overbite with the teeth sitting directly above the lower ones, or a large overjet with almost no vertical overlap. Because the corrections are not the same, the first thing an evaluation should give you is clarity about which one you actually have and by how much.
What causes an overbite
Causes fall into two broad categories, and the distinction drives everything that follows. A dental cause means the jaws are in a reasonable relationship but the teeth have erupted or tipped into the wrong position. A skeletal cause means the jaws themselves are mismatched in size or position, most commonly a lower jaw that sits back relative to the upper. The evaluation that distinguishes them is part of how we approach orthodontic treatment.
Genetics accounts for a good share of jaw size and shape. Beyond that, habits and function play a role during the years when the jaws are forming. Prolonged thumb sucking or extended pacifier use can push upper teeth forward and hold lower teeth back. A tongue that rests low in the mouth instead of against the palate withdraws the outward pressure the upper arch needs to develop its width, and a narrow upper arch often accompanies a retruded lower jaw.
Early loss of baby teeth allows neighboring teeth to drift into the space, which changes how the permanent teeth erupt. Chronic mouth breathing is associated with a lower tongue posture and an altered growth pattern of the face, which is why the conditions we screen for in children include breathing habits alongside the bite itself.
Why an overbite matters beyond appearance
Plenty of people live comfortably with a mild overbite and never need treatment. The reasons to address a significant one are functional rather than cosmetic.
A deep bite concentrates force on the front teeth in a way they are not designed to absorb, which over years can produce visible wear on the incisal edges and, in severe cases, lower teeth contacting the tissue behind the upper ones. A large overjet leaves the upper front teeth more exposed to trauma, which is a genuine consideration for children in contact sports.
Patients often ask whether their bite is causing jaw pain or headaches. The honest answer is that the relationship is not simple. The American Academy of Orofacial Pain describes temporomandibular disorders as multifactorial, meaning bite is one possible contributor among several rather than the single cause, and correcting an overbite is not a treatment for jaw pain on its own. If discomfort is the main concern, facial pain evaluation is the appropriate starting point rather than orthodontics.
How overbite is corrected at different ages
The single biggest variable is growth. What is available to a growing child is not available to an adult, and being told otherwise is a reason for a second opinion.
During childhood and adolescence
With growth still active, treatment can influence how the jaws develop rather than only repositioning teeth within them. Functional appliances encourage the lower jaw forward, and where the upper arch is narrow, palatal expansion creates the width the lower jaw needs in order to come forward at all. The American Association of Orthodontists recommends a first orthodontic evaluation by around age seven, which is early enough to identify a developing skeletal pattern while the options are still broad.
In adulthood
Once growth is complete, the jaws cannot be redirected. Mild to moderate cases that are primarily dental can still be corrected by repositioning the teeth, using braces or aligners with the mechanics adapted to intrude or reposition the front teeth. Significant skeletal discrepancies in adults are a different conversation, and honest treatment planning includes when a combined orthodontic and surgical approach is the option that actually addresses the problem, which means a referral rather than a compromise.
Retention applies at every age. Teeth and soft tissue have memory, and a corrected bite that is not retained tends to drift back toward its previous position. Any plan that does not include a retention phase is incomplete.
Where the airway fits in
A recessed lower jaw does not only affect the bite. It also positions the tongue and the soft tissues further back, which reduces the space available in the airway behind them. This is why an overbite that comes with snoring, restless sleep or persistent daytime fatigue deserves a broader look than a cosmetic assessment, and why some patients arrive here after a physician has already raised the treatment options for sleep apnea.
The relationship runs in both directions during development. A child who breathes through the mouth tends to hold the jaw open and the tongue low, and that posture over years influences how the face and jaws grow. Correcting the bite without addressing the breathing pattern leaves the force that produced it still in play, which is part of why muscle retraining is often paired with appliance work.
None of this means an overbite indicates a sleep problem. It means the two are worth evaluating together rather than assuming they are unrelated.
Not sure whether what you are seeing is an overbite, an overjet, or something else? Schedule an evaluation with our Orlando team and we will start by measuring it properly.
