How to Fix Gaps Between Teeth: Causes, Treatment Options, and Cost
Gaps between teeth, called diastemas, happen when teeth are narrower than the jaw they sit in, when a tooth is missing, or when tissue between the front teeth holds them apart. Braces and clear aligners close spacing predictably. The harder part is retention, because closed spaces reopen without a retainer.
Dr. Jenée Kaplan, DDS
Orthodontic residency and a Master’s degree at Loma Linda University. Member of the American Association of Orthodontists, the American Dental Association, and the California Dental Association.
What are gaps between teeth?
Spacing is crowding in reverse: the arch is longer than the teeth need. It can be a single gap between the upper front teeth, which is what most people mean by a diastema, or small spaces distributed all the way around both arches.
A gap between the upper central incisors is normal in children. It typically closes on its own when the canines erupt and push the front teeth together, which is why treating a seven-year-old’s front gap is usually the wrong call. In an adult the same gap is a settled feature and will not close by itself.
Not every gap needs treating. A small midline space that a patient likes is not a health problem, and there is no clinical obligation to close it. Where a gap matters is when it comes from a missing tooth, when food packs into it and the gum inflames, or when the spacing reflects a bite that is not working properly.
What causes gaps between teeth?
- Teeth narrow for the arch
- Inherited tooth size relative to jaw size, the mirror image of crowding. Frequently the upper lateral incisors are small — sometimes markedly so, sometimes missing entirely, which is one of the more common developmental absences.
- A prominent labial frenum
- The band of tissue running from the upper lip to the gum between the front teeth. When it attaches low and thick it can hold the central incisors apart and prevent a gap from closing or keep reopening one that was closed.
- Missing or extracted teeth
- Teeth drift toward an empty space over years, opening gaps elsewhere and tipping as they go. A tooth lost in the twenties frequently shows up as spacing and a collapsing bite in the forties.
- Tongue thrust and other habits
- A tongue pressing forward against the front teeth at rest or in swallowing applies light, constant force that separates them. This is also the reason some closed spaces reopen — the habit outlasts the treatment unless it is addressed.
- Gum disease
- Advanced periodontal disease destroys the bone holding teeth in place, and teeth migrate and splay as support is lost. Spacing appearing suddenly in an adult is a reason to be examined promptly rather than a cosmetic question.
Do gaps between teeth matter?
- Food packing and gum inflammation. Spaces that trap food between teeth keep the gum inflamed, and chronically inflamed gum loses attachment over time.
- Bite stability. Distributed spacing often means the teeth are not contacting each other properly, so the arch loses the mutual support that keeps everything where it is.
- Drift around a missing tooth. An unreplaced tooth lets its neighbors tip and the opposing tooth over-erupt, which complicates and raises the cost of restoring that space later.
- Speech. Significant spacing between the front teeth occasionally affects s and th sounds. It is uncommon, and worth assessing rather than assuming.
- Where a gap causes none of these, it causes none of these. Closing it is then a decision about appearance and belongs to the patient, not to a treatment plan.
How are gaps between teeth closed?
Clear aligners
Closing spaces is among the most predictable things aligners do — the movement is largely tipping and translating teeth toward each other, which trays control well. Simple spacing cases are often short.
Who it suits: Well suited to most spacing, particularly a single midline gap or mild distributed spaces in an adult. Requires consistent wear, and a plan for whatever caused the spacing, or it reopens.
Braces
Fixed appliances close spacing with precise control of root position, which matters when a large space is being closed or when teeth need uprighting as well as moving together.
Who it suits: Any spacing, and preferable for large gaps, cases with missing teeth where space has to be redistributed to a planned position for an implant or bridge, or where teeth have drifted and tipped.
Orthodontics with restorative work
Where lateral incisors are undersized or absent, the best result is often orthodontics to position the spaces correctly followed by bonding, veneers, or an implant by a restorative dentist. The orthodontic phase decides where the space goes; the restorative phase fills it.
Who it suits: Small or missing lateral incisors, and adults replacing a long-missing tooth. It requires the orthodontist and the restoring dentist to agree the plan in advance, which is arranged before treatment starts rather than discovered at the end.
Bonded retainer and long-term retention
A fine wire bonded behind the front teeth holds closed spaces closed permanently, usually alongside a removable retainer. For spacing this is not an afterthought — it is part of the treatment.
Who it suits: Essentially every closed-space case. Closed spaces reopen readily, so retention here is part of the treatment rather than an afterthought, and a patient who will not commit to it should hear that before treatment rather than after.
When are gaps treated, and at what age?
Children
Spaces between baby teeth are a good sign — they mean room for the larger adult teeth. A gap between the upper front teeth usually closes when the canines come in around eleven or twelve. The common correct answer for a young child with a front gap is to leave it alone and review.
Teenagers
Once the canines have erupted, a remaining gap is unlikely to close on its own and is treated with the rest of the bite. If a thick frenum is holding the teeth apart, a small procedure to release it may be recommended, generally after the space has been closed rather than before.
Adults
Spacing in adults is frequently about something else — a tooth lost years ago, a tongue habit, or gum disease. Treatment addresses the cause first. Closing spaces in an adult is often quick; keeping them closed is the part that requires commitment.
What does it cost to close a gap between teeth?
Orthodontic fees are quoted per case rather than per condition, because two people with the same diagnosis can need very different treatment. These are the factors that move the number up or down, so you know what you are being quoted on:
- Whether one gap is being closed or spacing is distributed across both arches.
- Aligners or braces, and whether treatment is limited to the front teeth or comprehensive.
- Any restorative work to build up small teeth or replace a missing one, billed by the restoring dentist.
- A frenum release where one is indicated, usually performed by a periodontist or oral surgeon.
- Retention, including a bonded retainer, which for spacing cases is a necessity rather than an upgrade.
Ask for the fee, the payment schedule, and your insurance benefit in writing at the consultation, before you decide anything. Any orthodontic practice should give you all three without being pressed.
When should you see an orthodontist about a gap?
- By age seven for a general evaluation, though a front gap in a young child is usually monitored rather than treated.
- If a permanent tooth appears to be missing, so space can be planned deliberately rather than lost by drift.
- When spacing appears or widens in adulthood — that warrants an examination for gum disease and drift, not just a cosmetic consultation.
- If food packs consistently into a space and the gum there bleeds or feels sore.
Questions patients ask about gaps between teeth
Will a gap between my front teeth close on its own?
In a child, often yes — the space usually closes when the canines erupt around age eleven or twelve. In an adult, no. A gap that has been stable through adulthood will not close without treatment, though it also does not necessarily need to.
Can clear aligners close gaps?
Yes, and closing spaces is one of the movements aligners handle most predictably. Simple cases are often among the shortest treatments offered. The essential condition is retention afterwards, because spaces reopen more readily than any other correction.
Why did my gap come back after treatment?
Almost always retention, a tongue habit, or a thick frenum that was not addressed. Closed spaces carry elastic memory in the fibres around the teeth, and without a retainer they reopen. A bonded wire behind the front teeth is the usual answer.
Do I have to close a gap between my teeth?
Not if it is not causing harm. A small midline space that does not trap food, does not reflect a bite problem, and does not bother you is a feature, not a diagnosis. Treatment here should be a choice you make, not one presented as necessary.
How long does it take to close a gap?
A single small gap can close in a few months. Distributed spacing across both arches, or spacing being redistributed around a missing tooth, usually runs twelve to twenty-four months. Length depends on how far teeth travel and whether roots need repositioning as well.