If your teeth do not line up the way you think they should, you are not alone. A bad bite, called a malocclusion, is one of the most common reasons people see an orthodontist. The tricky part is knowing which type you have. Here is a simple guide to overbite, underbite, crossbite, and open bite, and what each one means for your smile and health.
Overbite
An overbite is when the upper front teeth overlap too far in front of the lower front teeth. A small overlap is normal, but a deep overbite can cause excessive wear, gum irritation, and even lower teeth biting into the roof of the mouth. To check at home, smile in a mirror and bite together; if your top teeth cover more than about a third of your bottom teeth, you may have a deep overbite.
Underbite
An underbite is the opposite: the lower teeth sit in front of the upper teeth when you bite down. Underbites often relate to jaw growth and can affect chewing, speech, and facial balance. Early evaluation matters, because some underbites are easier to guide while a child is still growing.
Crossbite
A crossbite happens when one or more upper teeth bite inside the lower teeth, either in the front or along the sides. Crossbites can cause uneven tooth wear, jaw shifting, and asymmetric growth if left untreated. They are frequently corrected with braces, aligners, or an expander.
Open bite
With an open bite, the front teeth do not touch when the back teeth are closed, leaving a visible gap. Open bites are often linked to thumb sucking or tongue habits and can make biting and speaking difficult.
Why bite problems matter
Beyond appearance, an untreated malocclusion can lead to accelerated tooth wear, jaw strain, difficulty cleaning crowded areas, and chewing or speech challenges. Correcting the bite protects your long-term oral health. You can read more about how we correct common dental issues, and explore our braces and Invisalign options.
Frequently asked questions
Can braces fix all bite problems?
Most overbites, underbites, crossbites, and open bites can be corrected with braces or clear aligners. Severe skeletal cases may need additional appliances or, occasionally, coordination with an oral surgeon.
What is the best age to correct a bite?
The American Association of Orthodontists recommends a first check-up around age seven, when early intervention is most effective. That said, bites can be improved at any age, including adulthood.
Will Invisalign work for my bite?
Clear aligners treat many bite issues today. The best way to know is a personalized evaluation of how your teeth and jaws fit together.
Not sure which bite problem you have? Our Greensboro orthodontists can diagnose it in minutes. Book a free consultation and get a clear answer and a plan.