Implant or Orthodontics to Close a Gap: How the Choice Is Made

Patients presented with both options often assume they are alternatives — two routes to the same destination, one faster and one cheaper.

They are not. Orthodontic treatment redistributes the teeth you already have; an implant adds one. Which is appropriate depends almost entirely on a question that sounds odd until you think about it: does the arch have enough teeth?

Consider a space where a tooth is missing.

Orthodontics closes the space by moving other teeth into it. The arch ends up with the same number of teeth, arranged to fill the available length. Nothing is added. This works when the tooth count is short relative to the arch — in other words, when the space is surplus.

An implant fills the space by adding a tooth. The other teeth stay where they are. This works when the arch needs that tooth to be there — when moving the neighbours would create crowding elsewhere, spoil the bite, or produce an asymmetrical result.

A useful way to put the question: if the space were closed, would everything else fit properly, and would the bite still work?

• The gap is small and the surrounding teeth are already slightly spaced

• Crowding exists elsewhere in the same arch, so moving teeth relieves two problems at once

• The adjacent teeth are tipped or rotated and would benefit from correction anyway

• The opposing arch will still occlude correctly after closure

• Growth is incomplete, making implant placement premature in any case

• The patient prefers to avoid surgery

Our article on how fast aligners can close a diastema covers the common front-tooth version of this, and retainer hygiene and upkeep covers the retention that follows.

The critical caveat with space closure is anchorage: moving teeth into a space means something has to resist the reciprocal force, or the rest of the arch drifts backwards and the bite is spoiled. Our article on orthodontic anchorage explains the mechanics.

• The bite works correctly with the current tooth positions and closing the space would disturb it

• The space is in the posterior region, where closing a molar space requires very substantial tooth movement over a long period

• The adjacent teeth are heavily restored and moving them offers no benefit

• Symmetry matters — closing a space on one side only produces a visibly asymmetrical smile

• The patient has no wish to undergo a lengthy orthodontic course

• Growth is complete and bone volume is adequate

Our article on implant timing covers when placement becomes appropriate.

Congenitally absent upper lateral incisors — the small teeth either side of the two front teeth — affect a meaningful minority of people and are the textbook example of this choice. Two approaches exist, and both are legitimate.

Space closure with canine substitution. The canine is moved forward into the lateral incisor position and reshaped, usually with composite or a veneer, to look like a lateral. The premolar behind then takes the canine's place. No prosthesis is needed and no implant is placed.

It works best where the canine is relatively light in colour and narrow, where the bite permits a premolar to function in a canine position, and where the patient has a fuller-looking smile that tolerates a slightly reduced arch.

Space opening with an implant. Orthodontics creates the correct-sized space in the right position, and an implant crown is placed once growth is complete. The canine stays where nature put it, which is generally better for canine guidance in the bite.

It requires adequate bone width at the lateral incisor site — which is often deficient, since the tooth never developed there — and it requires waiting for growth to finish, sometimes into the twenties. A temporary replacement bridges the interval.

The decision is made jointly by the orthodontist and the restorative dentist, considering tooth shade and shape, the bite, the amount of space, bone volume, smile line and the patient's age. There is no universally correct answer.

A related situation is the peg-shaped lateral — present but undersized — where aligners plus bonding often resolve things without any implant. Our article on correcting peg laterals with aligners and bonding covers this.

Frequently, the answer is both. Orthodontic treatment is used to position the teeth correctly and create a space of the right dimension, and an implant is then placed into that properly prepared site.

This is often better than either alone. A space left by a lost tooth is rarely the right width for an implant crown — it may be too narrow after drifting, or too wide, or the roots of the adjacent teeth may have tipped into it so that there is insufficient room between them for a fixture. Orthodontic preparation resolves all three.

Our article on closing gaps with bonding after orthodontic treatment covers the cosmetic finishing that often follows.

A small gap between front teeth can sometimes be addressed with composite bonding alone, adding width to the adjacent teeth rather than moving or replacing anything. Our article on bonding for a small gap between front teeth covers the limits of that approach — it works for narrow spaces and is less suitable for wider ones, where the result would look disproportionate.

Neither option should be described as final.

Orthodontically closed spaces tend to reopen without retention. Retainers are not an optional extra after gap closure — they are part of the treatment, indefinitely. Our article on retainer costs and replacements covers the ongoing commitment.

Implants have high published survival rates but require lifelong maintenance, and crowns and components may need attention or replacement over time. Outcomes cannot be promised for any individual.

• Orthodontics redistributes existing teeth; an implant adds one. They answer different questions.

• The decision turns on whether the arch has enough teeth and whether the bite still works after closure.

• Space closure needs adequate anchorage, or the rest of the arch drifts.

• Missing lateral incisors can be treated by canine substitution or by space opening with an implant.

• The two are frequently combined, with orthodontics preparing the site.

• Small front gaps may need only bonding.

• Both approaches require ongoing maintenance — retention in one case, implant care in the other.

Can braces or aligners close any gap?

No. Closing very large spaces, particularly in the molar region, requires substantial tooth movement over a long period and adequate anchorage, and it is not always achievable or desirable. Small to moderate spaces are far more straightforward.

Is an implant faster than orthodontic treatment?

Not necessarily. Implant treatment involves healing periods that typically total several months, and longer if grafting is needed. Aligner treatment for a modest space may be complete within a similar time.

What happens if I close a gap but the bite no longer fits?

This is precisely why the bite is assessed before deciding. Closing a space without accounting for the opposing arch can produce an unstable occlusion, which may cause discomfort, wear or relapse.

Will an implant crown match my natural teeth?

Shade and shape matching is achievable to a high standard in most cases, though anterior implant aesthetics are demanding and depend heavily on the surrounding gum tissue. Our article on implant crown shade matching covers the process.

My child has a missing lateral incisor — what happens now?

Assessment by an orthodontist is the starting point, usually in the early teens. If space opening with a later implant is planned, the space is maintained and a temporary replacement provided until growth has finished.

Do I need retainers if I close a gap with aligners?

Yes, indefinitely. Closed spaces have a strong tendency to reopen, and retention is what prevents it.

If you have a gap and are unsure whether moving teeth or replacing one is the right route, a joint assessment considering both the orthodontic and restorative picture is the sensible starting point.

You can contact our team at our Wimpole Street practice, or read about ProAligner clear aligners and dental implants.

This article provides general information about closing gaps with orthodontic treatment or implants, and does not constitute individual dental advice. Suitability depends on the bite, tooth positions, bone volume, growth status and individual preference, all of which require clinical assessment. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 9 September 2027