Tooth Movement & Loss

Why do gaps open up between teeth, and why do teeth drift?

A gap that opens later in life is not a cosmetic problem; it is a sign that the support holding the tooth has decreased

Teeth that have looked the same for years start to spread apart, and the front teeth start to tip forwards. Nobody has done anything to them; what has changed is the bone that holds them in place. On this page we explain why teeth drift, how urgent it is and what becomes irreversible if you wait.

Short answer

Teeth drift because the support that holds them in place has decreased. Every day, the tongue presses on each tooth from the inside, the lips and cheeks from the outside and chewing from above; while the bone around the root is sound, these forces balance out and the tooth stays put. When the bone shrinks, the balance is lost and the tooth drifts in the direction the force pushes it: the upper front teeth fan out forwards, gaps widen, a tooth grows longer. The same happens when a back tooth is extracted: the neighbouring teeth tip into the gap, and the opposing tooth starts to over-erupt out of its socket.

The main cause: Shrinking of the bone holding the tooth
The second cause: A back tooth extracted and not replaced
Is it urgent?: Not same-day, but not to be put off for months
Initial assessment: From your X-ray, within 24 hours

Medically reviewed by Bilge Ilgın, Dentist · ImplantologyLast reviewed 2026-08-31

What gaps opening between teeth are telling you

A tooth is not a nail driven into the bone. Between the root and the bone there is a thin layer of connective tissue, and thanks to this tissue the tooth remains a structure that can move throughout life. The tongue pushes from the inside, the lips and cheeks press from the outside and chewing force comes from above. In a healthy mouth these three forces balance each other out, and teeth stay in the same place for decades. Gaps opening up mean that this balance has been lost.

What really upsets the balance is bone loss. As gum disease progresses, the bone surrounding the root slowly shrinks, and the tooth tries to stay upright with less of its root held in bone. The force of the tongue and lips has not changed; what has changed is the amount of support resisting that force. The upper front teeth fan out forwards, a gap appears between the two front teeth where there has been none for years, and one tooth grows longer than its neighbours and sticks out. This is called pathological tooth migration, and it is the point at which patients first notice their gum disease. Bone loss progresses painlessly; the first thing you see in the mirror is not pain but the gap that has opened.

The second cause is a missing back tooth. A molar is extracted, nothing is put in its place because the gap does not show, and that is thought to be the end of it. But teeth lean against each other in a row: the neighbour behind tips into the gap, the tooth in front shifts backwards, and the tight contact points between them open. Every contact point that opens turns into a pocket where food gets trapped, and decay starts there. A tooth lost at the back becomes the cause of a gap opening at the front.

The same gap has another consequence in the opposite jaw. A tooth with no tooth left to chew against slowly moves out of its socket and rises past the level of its neighbours; this is what we call the opposing tooth over-erupting. The over-erupted tooth locks the bite and uses up the vertical space that a tooth placed in that gap will need later. It is not only the area of the lost molar that pays the price, but the opposite jaw too.

Teeth grinding plays a real part, but it is not decisive on its own. Grinding at night does not on its own destroy the support of a tooth surrounded by sound bone. With weakened support, however, the same force speeds up drifting: the front teeth tremble enough to feel with a finger when you bite, your jaw feels tired in the morning, and the biting edges wear flat to the same level. Here grinding is not what starts the disease but what speeds it up. Just wearing a night guard without dealing with the cause slows things down, but does not change the direction.

Not every gap that opens is drifting. When the gum recedes, the triangle of gum filling the space between two teeth disappears and a black triangle is left behind; the teeth stay where they are and the contact points are closed, only the space beneath them has emptied. Mild crowding of the lower front teeth that appears with age is also a separate issue; teeth creep forwards by fractions of a millimetre throughout life, and we see this in healthy mouths too. The situation to worry about is teeth moving in directions they have not moved before, within the last few months.

Which gaps can wait and which cannot

The only thing that makes the distinction is speed: when did the gap start, and has it grown since then? The two lists below are so that you can tell which side you are on before you see a dentist.

The tooth can be saved

The gap has been the same for yearsA gap between the two front teeth that has been there since you were young and has not grown is the result not of bone loss but of the size of the teeth and the width of the jaw. This is purely a cosmetic matter.
The teeth moved after orthodontic treatmentIf a retainer was not worn after the braces came off, the teeth go back to their old positions. There is nothing wrong with the supporting tissues; what needs doing is to realign the teeth and, this time, keep wearing the retainer.
Only the gum has recededIf the contact points are closed and only a black triangle shows at the bottom between the teeth, the teeth have not moved. The problem is the lost triangle of gum; the priority is to stop whatever is causing the recession.
Mild crowding of the lower front teethWe see the lower incisors starting to overlap over the years in healthy mouths too. If your gums are healthy and there is no bleeding, this is not a sign of disease; we point out the surfaces that have become harder to clean and set up your care accordingly.

Saving it is unlikely to hold

The gaps started in the last few monthsTeeth that have stayed the same for years moving within a short time is a sign of active bone loss. The issue here is not appearance; it means the process causing the movement is still at work.
The upper front teeth are fanning out forwardsUpper incisors fanning out forwards are the most recognisable sign of advanced gum disease. The lip's force pushing them back has been overcome, which means a significant part of the bone around the roots has gone.
The teeth with gaps between them are also looseMovement and gaps together show that support is being lost in two ways at once. In this situation, every month of delay eats into the bone that is left.
A gap has opened at the front while a back tooth is missingWhen the molars that carry the chewing load are gone, the load shifts to the front teeth. Front teeth are not made to carry this load; within a few years they tip forwards. The source of these gaps is not the front teeth but the gap at the back.

What we look at during the examination

The aim of this sequence is not treatment but to establish the cause of the gaps and how fast they are opening. At the end you will know why the teeth are drifting, whether the process is still at work and what will be done in which order.

1
Send us your X-ray
If you have a panoramic X-ray or a CBCT scan, send it through the form; we look at the bone level and write to you within 24 hours about what you are dealing with. This is an initial assessment; the final decision is made after an examination and pocket measurements.
2
We talk about when it started
A gap that has opened within a year and a gap that has stayed the same for ten years are not the same thing. Old photos of your smile on your phone are as useful here as an X-ray; the difference between two photos shows directly how fast the process is moving.
3
Measuring pocket depth and bleeding
Around every tooth we measure the depth of the pocket between the gum and the root, and mark the points that bleed when the probe touches them. Deep pockets around the teeth that are drifting apart explain the drifting on their own.
4
The bite and signs of grinding
We look at which tooth touches first when you bite, whether the front teeth tremble as you bite, at flattening of the biting edges and at chipping around the edges of fillings. These signs tell us where the force on the tooth is coming from.
5
X-rays and, if needed, a CBCT scan
A flat X-ray shows the bone level and the angle at which neighbouring teeth have tipped. In areas with missing teeth, we use three-dimensional imaging to see how far the opposing tooth has over-erupted and the true height of the remaining bone; what can be done in that gap later depends on this measurement.

What can be done

These are not rival options but steps carried out in order. When the order is broken, the work done goes to waste; that is why we explain which comes first and why.

The cause first: gum treatment

A scale and polish and cleaning of the root surfaces from inside the pockets remove the source of the inflammation. This treatment does not bring back bone that has been lost; it stops the loss. This is the first step with gaps between teeth, because every step taken while the loss continues is temporary.

Managing the force: bite adjustment and a night guard

The force on the tooth is balanced by reducing the surface that touches first when you bite. If you grind at night, a night guard takes the force off the teeth. It is not a treatment on its own; it is a seat belt that protects the results of the other steps.

Splinting

Loose teeth are joined to their neighbours with a thin wire or a composite strip; several teeth behave as a single piece and the chewing load is shared. It stops movement and makes chewing more comfortable. It is not used on its own, because if the inflammation underneath is not treated, bone loss continues silently.

Orthodontic treatment, but in the right order

The gaps that have opened are closed with braces, and incisors that have tipped forwards are brought back. There is one clear condition: the inflammation must be over first. A closed gap stays closed as long as a retainer is worn for life; reduced bone support is not enough on its own to hold the tooth in place.

Filling the gap

If the drifting is caused by a missing back tooth, the real treatment is filling that gap. The replacement tooth stops the neighbouring teeth tipping and the opposing tooth over-erupting, and takes the chewing load off the front teeth. For a single gap, an implant or a bridge; if many teeth are missing, the plan is made for the whole mouth.

What happens if it is ignored

The most misleading thing about gaps opening is that they are painless. We are not writing the points below to frighten you, but so that you can ask the right questions whichever dentist you see.

Gaps make themselves bigger

Food gets trapped in every gap that opens, and that spot becomes impossible to clean with a brush. The plaque that builds up makes the inflammation worse, the inflammation destroys bone, and the lost bone opens the gap further. Once the process has started, it produces its own fuel.

An over-erupted tooth takes up the space a future tooth needs

A tooth with nothing opposite it keeps moving out of its socket and closes the vertical space above the gap. On the day something is done about that gap, the over-erupted tooth has to be shortened, root-treated or extracted. A single gap left unfilled becomes a problem for two teeth a few years later.

A tipped tooth is harder to treat than an upright one

A molar leaning into the gap cannot be used as a support for a bridge, and a proper tooth cannot be built on it. Uprighting it means orthodontic treatment and months of time. If the gap is filled early, none of these steps comes into it.

Covering up the appearance does not stop the process

Joining gapped front teeth together with crowns or veneers corrects what you see in the mirror. If bone loss is continuing underneath, the teeth keep drifting inside the crowns, and within a few years both the crown and the tooth are lost. This is the most expensive mistake made with gaps between teeth.

In an inflamed mouth, braces speed up bone loss

Orthodontic force works by reshaping the bone around the tooth. Applied while there is active inflammation, the same force speeds up bone loss. If braces are to be fitted to close gaps, gum treatment must be finished first.

What to expect afterwards

The sequence below applies to the route that starts with gum treatment. If orthodontic treatment or replacing missing teeth comes into it, it takes longer; the order does not change.

The first two weeks
Tenderness in the gums and temporary sensitivity to cold are normal. Bleeding seems to increase in the first few days, then decreases quickly. Do not stop brushing; the pockets closing depends on cleaning at home. You do not need to take time off work.
Six to eight weeks
The gums firm up, the bleeding stops and we measure the pocket depths again. In the same session we also reassess how much the teeth move. If the drifting has stopped, this is where we start talking about orthodontic and cosmetic treatment.
If orthodontic correction is chosen
Closing the gaps and uprighting tipped teeth is work that takes months. During this time gum check-ups become more frequent, because the bone under force needs to be monitored closely. When the braces come off, the retainer comes into use and is worn permanently.
If missing teeth are to be replaced with implants: three clinical days
In the protocol we use, the implants lock mechanically into the hard basal cortical layer deep in the jaw. A conventional implant, by contrast, is placed in the upper part that shrinks along with the tooth, that is, the alveolar bone; because that is the bone lost most in gum disease, volume first has to be built up with a graft, and then there are months of waiting for fusion. That is where the difference comes from. Bone grafting and months of waiting do not come into it, and at the end of three clinical days you leave with your final fixed teeth. This protocol is for the full mouth or many missing teeth.
A check-up every six months
The process that started the gaps is kept under control; it is not closed off and finished. Regular check-ups show early on whether pocket depth is increasing again; when care slips, the gums give the first warning.

Message us right away if

Teeth that have visibly shifted within a few weeks. Movement that speeds up is a sign of progressing inflammation or of excessive force on that area. Call us without waiting for your appointment.
Swelling, discharge or a bad taste where the gap has opened. These are signs of active infection and need to be assessed the same day.
A tooth that has both moved apart and started to feel loose. The two symptoms appearing together show that support has decreased markedly. In this situation, the price of waiting is bone.

What determines the cost

We do not give a single figure on this page, because with teeth that are drifting apart the route can end with gum treatment or extend to orthodontic treatment and replacing missing teeth; the difference between the two is large. We give you the right figure after seeing the X-ray and the examination measurements. Send us your X-ray and we will share the scope in writing. These are the items that determine the price:

The cause of the drifting: Gum treatment, splinting, orthodontic treatment and replacing a missing tooth are different procedures, with different lengths and numbers of sessions. A figure given before the cause has been identified is bound to change at the clinic.
How many teeth are affected: Advanced gum disease does not stay in one area. A plan built around four front teeth and a plan covering the whole mouth are costed separately.
How many teeth are missing, and for how long: In an area left empty for a long time, neighbouring teeth tipping and the opposing tooth over-erupting mean extra procedures. If the gap is filled early, none of these items comes into it.
Bridgework: The material of the fixed teeth to be made and the laboratory work have a direct effect on the total. We tell you in writing from the start which brand of material we use.

Frequently asked questions

Will teeth that have drifted apart go back to where they were on their own?

Mostly not, but there is an exception. A tooth stays where it has drifted, because the force that would push it back is gone. On the other hand, if the gaps have only just started and the space that has opened is small, we do see the tooth move partly or fully back to its old position once the inflammation has cleared; we count this as a bonus if it happens, not as the treatment plan itself. With advanced, large gaps, waiting is a waste of time; there, closing the gap is a separate procedure and is only done once the inflammation is over.

Gaps are opening between my teeth but I have no pain at all. Do I need to hurry?

Bone loss caused by gum disease progresses painlessly; the lack of pain does not mean the process has stopped. Gaps opening between teeth are a late sign of the process, not an early one. You do not need to rush in the same day, but the price of putting it off for months is that your options narrow: a situation that can be stopped with gum treatment today turns, the longer it is put off, into a decision about extraction.

I had a back tooth taken out and did not have anything put in because it does not show. Will that cause problems?

It will. What is more, you see the result not in that gap but somewhere else. The neighbouring teeth tip into the gap, the opposing tooth in the other jaw over-erupts, the contact points open and the chewing load shifts to the front teeth. In patients who come to us with gaps opening between their front teeth, the real source is a molar extracted years ago.

Is closing the gaps between my teeth with veneers a solution?

It corrects the appearance, not the cause. If bone loss is continuing underneath, the teeth keep drifting inside the veneers, the edges open up and within a few years you lose both the veneer and the tooth. Cosmetic work takes its turn after gum treatment is finished and the movement has stopped.

Can the gaps be closed with braces?

They can. The condition is that the inflammation is over before treatment starts. Orthodontic force applied in a mouth with active inflammation speeds up bone loss. After the gap has closed, a retainer is worn permanently; reduced bone support does not hold the tooth in place on its own.

Many of my teeth have drifted apart and are loose. Is your fixed teeth in three days method right for me?

It would not be right to say without seeing an X-ray, but this is exactly its area: the protocol we use is for the full mouth and many missing teeth. If most of your teeth can be saved, we will recommend gum treatment and keeping your teeth, and we will say so plainly in writing. Carrying teeth that cannot be saved for years, on the other hand, destroys the bone in that area and makes the next plan harder.

Sources

Send your X-ray and we will tell you which option is realistic for your tooth.

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Next step

Send your X-ray and we will talk through the options.

Share your CBCT or panoramic X-ray. We will write back within 24 hours on which option is realistic for your tooth.

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