Guide
Overbite, underbite, crossbite: understanding bite types
Your bite is how your upper and lower teeth fit together. Here are the most common bite problems orthodontists treat and why they matter.
From the orthodontists at NA Orthodontics
Overbite and overjet (Class II)
The upper teeth sit too far over or in front of the lower teeth. This is often called buck teeth. It can come from jaw growth, thumb sucking or the way teeth erupt. Large overjets make front teeth more likely to chip in a fall.
Underbite (Class III)
The lower teeth sit in front of the upper teeth. Underbites are often related to jaw growth, which is why checking children early matters. Some underbites are guided with appliances while a child grows.
Crossbite
Some upper teeth sit inside the lower teeth instead of outside. A crossbite can be in the front or the back. It can wear teeth unevenly and sometimes pushes the jaw to one side.
Open bite
The front teeth do not touch when the back teeth are closed. Habits like thumb sucking or tongue thrust can play a role. Open bites can make biting into foods like sandwiches harder.
Deep bite
The upper front teeth cover too much of the lower front teeth. In some cases the lower teeth bite into the gums behind the upper teeth.
Crowding and spacing
Not enough room makes teeth overlap. Too much room leaves gaps. Both are common and can be treated with braces or Invisalign.
How we treat bite problems
Our orthodontists start with an iTero 3D scan and a full exam, then explain your options. Treatment may include braces, Invisalign, or early treatment for growing children. Consultations are free under 18.
Frequently asked questions
- What is the difference between an overbite and an overjet?
- An overbite is how much the upper front teeth overlap the lower front teeth vertically. An overjet is how far the upper teeth stick out in front of the lower teeth. People often call both an overbite.
- At what age should a child's bite be checked?
- The American Association of Orthodontists recommends a first orthodontic check by age 7. Many bite problems are easier to guide while a child is still growing.
- Can Invisalign fix an overbite or crossbite?
- Many bites can be treated with Invisalign, and some are better treated with braces or growth appliances. Our orthodontists tell you which option fits your bite at the consultation.
- Will a bad bite fix itself?
- Usually not. Some issues are watched while a child grows, but most bite problems do not correct on their own.
Consultations are free for patients under 18. Adult consultations are $90, credited toward treatment.
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