An anterior open bite — back teeth together, front teeth apart — affects biting, speech and lip posture. It’s also the bite issue most likely to relapse if the underlying cause is ignored, which makes diagnosis the whole game.
Cause first
- Habits — prolonged thumb or finger sucking mechanically holds front teeth apart; stop the habit early and young bites often self-correct substantially.
- Tongue posture & mouth breathing — a low, forward tongue resting between the teeth reopens any bite that mere mechanics closed. This is where airway-aware screening is not a buzzword but the treatment plan.
- Skeletal growth patterns — vertical growers with genuinely skeletal open bites need honest framing: mild cases camouflage; severe adult cases can involve a surgical conversation, named upfront.
The tools
Modern aligners are genuinely good at closing mild-to-moderate open bites (their posterior coverage helps control vertical). Braces with vertical mechanics handle the fuller range. Habit appliances and myofunctional referral address tongue patterns. The right combination follows the cause — so at a consultation, the question that reveals provider quality is simply: “why is my bite open, and how does the plan address that cause?” A recommendation without a cause is a red flag worth a second opinion.
How we approach an open bite at our practice
We start by finding the cause, because the appliance follows from it. A sucking habit in a young child: a habit appliance and encouragement, then watch the bite recover. A low, forward tongue posture: myofunctional work alongside mechanics, or the bite reopens. A narrow upper arch with mouth breathing: expansion during growth and an airway screen. A genuinely skeletal vertical pattern in an adult: braces or aligners for the mild-to-moderate cases — modern aligners are surprisingly good at closing anterior open bites — and a surgical conversation for the severe ones, named up front rather than mid-treatment.
Why open bites relapse, and what we do about it
Because the tongue is stronger than any retainer. If the resting posture that opened the bite isn't changed, the bite finds its way back. So retention for an open bite is partly retainers and partly habit — where the tongue sits, how the lips rest, whether the nose is doing its job. We'll be specific about that at debond, and we'll want your dentist watching for it at cleanings too. The airway page explains why breathing and open bites so often travel together.
A word for adults with a long-standing open bite
Many were told years ago that surgery was the only answer. For moderate cases, modern aligner mechanics have changed that — we now close open bites we'd once have sent to a surgeon, by intruding the back teeth and letting the front teeth come together. It isn't every case, and the tongue-posture work still matters, but it's worth a fresh assessment before assuming the old advice still holds. The surgical page covers the cases where it does.
Open bite questions we're asked
Can an open bite be fixed with Invisalign?
Mild-to-moderate anterior open bites respond well to modern aligner mechanics — often better than braces. Severe skeletal open bites may still need a surgical conversation.
What causes an open bite?
Sucking habits, low tongue posture and mouth breathing in children; vertical growth patterns; sometimes both.
Will an open bite come back after treatment?
It's the most relapse-prone bite pattern if the cause — usually tongue posture — isn't changed alongside the mechanics.
Does an open bite affect speech?
It can — certain sounds depend on the front teeth meeting. Correction often helps.
Related reading
- Thumb sucking and soothers — the commonest cause in children
- Airway-aware orthodontics — why breathing and open bites travel together
- Jaw surgery — for the severe skeletal cases
The bottom line
Find the cause — a habit, the tongue, breathing, or growth — and treat it alongside the mechanics, or the bite reopens. Modern aligners handle many moderate open bites well; severe skeletal ones may still need surgery; and in children, the habit and airway work matter as much as any appliance. A specialist who can name your cause is the one to treat it.