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Underbite vs. Overbite vs. Crossbite: What’s the Difference?

By Connolly Orthodontics

If you've ever wondered whether you or your child has an overbite, underbite, or crossbite, you're not alone. Bite issues (also called malocclusions) are incredibly common — and they’re one of the main reasons families visit us at Connolly Orthodontics. When you understand the kind of bite you have, treatment options start to make a whole lot more sense.

Whether you're in Matthews, NC, Ballantyne, NC, or a nearby community, we’re here to explain malocclusions in a way that’s clear, accurate, and easy to understand.

Let’s take a closer look at the three most common bite types and how orthodontic treatment can help.

What Is a Malocclusion?

A malocclusion simply means that the upper and lower teeth don’t fit together properly when you bite down. Some bite issues are mild; others affect chewing, speaking, jaw comfort, and long-term dental health.

The three most common bite types we treat are:

  • Overbite
  • Underbite
  • Crossbite

Here’s what each one means and how we help correct them.

Overbite: When the Top Teeth Sit Too Far Forward

An overbite happens when the upper front teeth overlap the lower front teeth more than normal. Some overlap is completely natural, but too much can cause issues.

Common signs of an overbite:

  • Upper teeth noticeably cover the lower teeth
  • Deep bite (lower teeth almost disappear when you bite down)
  • Excessive tooth wear
  • Jaw discomfort or jaw clicking
  • Difficulty biting into certain foods

What causes an overbite?

Overbites often come from genetics, but habits like thumb-sucking or prolonged pacifier use can also contribute.

How we treat overbites

Treatment depends on age and severity but may include:

Correcting an overbite not only improves your smile’s appearance — it protects your front teeth from excessive wear and can reduce stress on the jaw joints.

Underbite: When the Lower Teeth Sit in Front of the Upper Teeth

An underbite is the opposite of an overbite: the lower teeth and jaw sit ahead of the upper teeth. Underbites tend to be more noticeable and can affect both appearance and function.

Common signs of an underbite:

  • Lower jaw juts forward
  • Difficulty biting or chewing
  • Speech difficulty (such as lisping)
  • Faster wear on the front teeth
  • Jaw strain or discomfort

What causes an underbite?

Most underbites are hereditary, meaning they run in families. In some cases, the lower jaw grows too large or the upper jaw grows too small.

How we treat underbites

Treatment may include:

  • Braces
  • Invisalign (for certain cases)
  • Rubber bands or elastics
  • Palatal expanders (in growing children)
  • Growth modification appliances
  • In severe adult cases, jaw surgery combined with orthodontics

Early treatment during childhood or early teen years can sometimes prevent the need for more complex treatment later.

Crossbite: When Some Upper Teeth Sit Inside the Lower Teeth

A crossbite occurs when one or more upper teeth bite inside the lower teeth instead of outside. Crossbites can affect front teeth, back teeth, or both.

Common signs of a crossbite:

  • One side of the bite looks “off”
  • Upper teeth sit behind lower teeth on one or both sides
  • Shifting the jaw to one side while biting
  • Uneven tooth wear
  • Gum recession or enamel chipping

What causes a crossbite?

Crossbites can be caused by uneven jaw growth, early childhood habits, crowding, or genetics.

How we treat crossbites

Depending on age and severity, we may recommend:

  • Expanders to widen the upper jaw
  • Braces
  • Invisalign
  • Elastics
  • A combination of appliances

Correcting a crossbite can also prevent asymmetric jaw growth in children and reduce the risk of premature tooth wear.

Do Bite Problems Need to Be Treated?

Most bite issues will not fix themselves, especially in adults. If left untreated, malocclusions can lead to:

  • Premature tooth wear
  • Jaw pain or TMJ discomfort
  • Difficulty chewing
  • Increased risk of chipped or cracked teeth
  • Gum recession
  • Speech concerns

The good news? Orthodontic treatment is highly effective at correcting all of these bite types — and modern options make treatment more comfortable and discreet than ever.

Which Treatment Option Is Best for You?

During your consultation, we’ll take digital scans, evaluate your bite from every angle, and explain your treatment options clearly. Depending on your needs, we may recommend:

  • Braces
  • Invisalign
  • Early orthodontic treatment (for children)
  • Rubber bands
  • Expanders
  • Growth modification appliances

Every smile and every bite is different — and we design your treatment plan around what you need.

Let Us Help You Get a Healthy, Balanced Bite

If you’re concerned about an overbite, underbite, or crossbite, you’re not alone — and you’re not stuck with it. Families from Matthews, Ballantyne, and throughout the area trust Connolly Orthodontics to guide them toward a smile that looks great and functions comfortably.

Schedule a free consultation to learn more about your bite and explore the best treatment options for you or your child.

Remember, a balanced bite isn’t just about appearance — it’s about comfort, confidence, and long-term dental health. And we’re here to help you achieve it.

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