Overbite, Underbite, Crossbite: What Your Child's Bite Problem Actually Means

You’ve noticed something looks a little off about the way your child’s teeth come together — maybe the top teeth stick out, maybe the bottom jaw juts forward, maybe the teeth just don’t seem to meet. You’re not sure what to call it, or whether it’s something to worry about. Take a breath. Most bite problems are common, nameable, and very treatable — especially when caught early.

Here’s what those terms actually mean.

First: What Is a “Bite Problem”?

A bite is simply how your upper and lower teeth fit together when you close your mouth. When they line up well, chewing, speaking, and cleaning all happen the way they should. When they don’t, it can affect more than just how a smile looks — it can affect function and long-term dental health. That’s why orthodontists pay close attention to bite, not just crooked teeth.

The Common Bite Problems, Defined

These are some of the orthodontic issues we see most often at our New Hyde Park office:

Overbite

The upper front teeth overlap too far over the lower teeth. A little overlap is normal — a lot can wear down teeth over time and put strain on the jaw.

Underbite

The lower teeth or jaw protrude in front of the upper teeth. Because it often involves how the jaw is growing, an underbite is one of the problems where earlier evaluation really helps.

Crossbite

Some upper teeth sit inside the lower teeth instead of outside where they belong. Crossbites can cause uneven wear and, in kids, sometimes lead to cheek biting or a jaw that shifts to one side.

Open Bite

The upper and lower teeth don’t meet when the mouth is closed. This can make biting into food or speaking clearly more difficult.

Overjet (Protrusion)

The upper teeth protrude significantly forward — often what people picture as teeth that “stick out.” Beyond appearance, protruding front teeth are more vulnerable to injury.

You may also hear about crowding (not enough room for teeth to fit properly) and spacing (gaps between teeth) — both of which often show up alongside a bite problem.

Why Bite Problems Matter — Beyond Looks

It’s easy to assume this is all cosmetic. It isn’t. A bite that’s off can make chewing harder, wear teeth unevenly, strain the jaw, and make certain areas tougher to keep clean. Left unaddressed, small issues in a growing child can grow right along with them. Treating a bite well is about function and long-term health — a confident smile is the bonus.

When Should You Get It Checked?

You don’t have to diagnose anything yourself — that’s our job. We recommend a child’s first orthodontic check-up around age 7, or at the first sign of a problem, even if they’re younger. At that age we can spot how the bite and jaw are developing while there’s still plenty of room to guide things gently. Our early treatment (Phase 1) page walks through the warning signs worth watching for: pain or difficulty chewing, mouth breathing, jaw shifting or pain, cheek biting, and early or late loss of baby teeth.

Want the bigger picture on timing? Our article on why early orthodontic evaluation is essential for kids explains why catching things early so often means simpler treatment later.

The Reassuring Part

If something looks off, it’s worth a look — but noticing it is not a reason to panic. Bite problems are among the most familiar things an orthodontist treats, and an early evaluation often means fewer, gentler steps down the road. Sometimes we simply watch and wait.

If you’re unsure what you’re seeing, schedule a consultation with Nexus Orthodontics in New Hyde Park. Dr. Fung will take a look and give you a clear, honest picture — no guesswork required.

— Dr. Shauna Fung, DDS, Board-Certified Orthodontist Nexus Orthodontics, New Hyde Park, NY