Appearance & Function

I chew on one side: what harm does it do?

The real problem is not the habit itself but whatever pushes you to that side

If you have chewed on the same side for years, two separate kinds of damage are building up in your mouth: tartar and gum inflammation on the side you do not use, and wear and cracks on the side you do. On this page we explain what happens on each side, where the habit comes from, when you need to act quickly and how the cause is dealt with.

Short answer

The mouth is built to use both sides; when you switch to one side, both sides suffer. On the side you do not use, the natural cleaning that chewing provides is lost, plaque hardens into tartar and the gum becomes inflamed. On the side you do use, the teeth do twice the work, so they wear faster and crack, and the jaw joint on that side is under constant load. The real issue, though, is not the habit: nobody chews on one side for fun. As long as the painful tooth, missing molar or uncomfortable crown pushing you to that side is not dealt with, the habit comes back.

On the side you do not use: Tartar build-up and gum inflammation
On the side you use: Faster wear, cracks, load on the joint
What really needs solving: The cause pushing you to one side
See a dentist the same day for: A locking jaw, swelling, fever

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

What happens in your mouth when you chew on one side

In a healthy mouth, chewing switches sides: food is crushed on the right, then on the left, the tongue carries it between the two sides and the cheek muscle sweeps the outer surfaces. Much of the mouth's self-cleaning mechanism comes from this. When you switch to one side, half of this mechanism stops.

Let us say this from the outset: chewing on one side is not a choice, it is a symptom. There is always a specific cause behind it: a tooth that hurts when you bite, an exposed root surface, back molars that have been taken out, a crown left too high or a denture that rubs the gum. You learn to use the side that does not hurt within a few weeks, and even after the cause has gone, the habit does not reverse on its own.

On the side that is not used, the plaque is left undisturbed. Chewing, the tongue and the flow of saliva constantly break up the layer of bacteria on the surface of the teeth; without this, the plaque stays put, hardens and turns into tartar. Tartar no longer comes off with a toothbrush and builds up at the base of the gum. The inflammation that results can be reversed at first; once it reaches the bone, it can no longer be reversed, and it progresses without pain. Patients tell us in surprise: the side they never put any strain on is the side that bleeds.

On the side that is used, meanwhile, the teeth are doing the work of both sides. Enamel does not renew itself; the load on one side flattens the cusps and shortens the life of the fillings on that side. More important than wear is cracking, and it has a clear signature: pain that comes not when you bite down but as a short, sharp jolt the moment you release the bite. A crack leaves no trace on an ordinary X-ray, advances with every bite and, once it reaches below the gum, that tooth cannot be saved.

The muscles reflect this imbalance too. The masseter, the strongest of the chewing muscles, develops as it works; while the side that is always working thickens, the other side does not get the same stimulus. Over years, a difference forms between the two halves of the face, and if teeth are missing on the same side, thinning of the bone makes this bigger.

The lower jaw is a single bone and the joints at its two ends cannot work independently; always chewing on the same side loads one joint in the same way at every meal. Jaw joint problems do not have a single cause; chewing on one side does not create the problem, but it is a load that makes existing strain worse. The signs are a tired jaw in the morning, catching on one side when you open your mouth and pain that spreads to the ear.

The digestive side is real too. Chewing is the first mechanical stage of digestion: it breaks food down to a size that can go down to the stomach and mixes it with saliva. In people who chew on one side, food is usually ground less thoroughly; in some people this turns into complaints of bloating and a heavy feeling after meals. The effect becomes really noticeable in people with missing back teeth: hard and fibrous foods drop off the menu.

When it can wait, and when it cannot

Chewing on one side is not urgent in itself; some of the causes that create this habit are. What makes the distinction is what is happening on the side you do not chew on.

The tooth can be saved

The habit is only a few days oldAfter a new filling, an extraction or gum treatment, it is normal to chew on the other side for a while. After an extraction it is actually necessary: in the first days you do not chew on that side and you eat soft foods so that the blood clot in the socket stays in place, and the pain stopping does not mean the socket has closed. The only thing to watch is not letting the habit become permanent: after about three days, once that side can be used comfortably, bring it back into use.
Your jaw makes a noise but there is no painA clicking sound when you open your mouth is a common finding when there is no pain and no limitation of movement, and it does not need treatment. What really matters for you is pain and how wide your mouth opens.
Bleeding when you brush on the side you do not chew onBleeding is a sign of the first, reversible stage of inflammation; it can wait for a cleaning appointment within a few weeks. Do not brush that side less; stopping because it bleeds makes the inflammation worse.
There is wear but no sensitivityFlattened chewing surfaces are a record of past load and do not need urgent treatment today. The aim is to stop the force that produces the wear before repairing it.

Saving it is unlikely to hold

A tooth on one side hurts when you biteIf the reason for the habit is pain, this is no longer about chewing on one side. Pain that comes with pressure points to a crack, inflammation at the tip of the root or a fracture; none of these goes away on its own. Have this tooth seen this week.
Swelling or discharge in the gum, or a feverThese signs show that the infection has spread beyond the bone, and they need to be assessed the same day. If you are having difficulty swallowing or breathing, do not wait for a dentist; go to A&E.
Your jaw locksA sudden narrowing of how wide your mouth opens usually means the disc inside the joint has slipped out of place; because muscle spasm and infection can cause a similar picture, an examination tells the causes apart. It needs to be assessed early; the longer it is left, the more the restriction of movement becomes established.
Your back teeth are missing on one sideHere chewing on one side is not a habit but a necessity, and the load on the other side increases every year. Until the gap is closed, the neighbouring teeth tip over, the tooth in the opposite jaw grows into the space and the bite is thrown off. It is a decision that gets more expensive the longer it is put off.

How we find the cause

The sequence below is for diagnosis, not treatment. At the end it becomes clear which side you chew on, what pushed you to it and how much damage has built up on each side.

1
We take your history
How long you have been chewing on one side, whether it started with pain or with an extraction, and whether your jaw is tired in the morning. A habit of one year and a habit of fifteen years do not produce the same mouth.
2
The mouth tells us which side is not used
We see this without the patient needing to tell us: tartar and staining are clearly heavier on one side, while flattening of the chewing surfaces is on the other. This asymmetry also shows how many years old the habit is.
3
We find the tooth you are avoiding
We have you bite on a bite stick, one suspect tooth at a time, apply a cold test and tap the teeth to see how they respond. Sharp pain when you bite and release points to a crack; dull pain when the tooth is tapped points to inflammation at the tip of the root.
4
Bite and joint examination
We use articulating paper to see which tooth touches first; a single surface left too high is enough to push chewing to the other side. Then we measure how wide your mouth opens and press on the muscles and the joint area to record any difference between the two sides.
5
Imaging
A panoramic X-ray shows missing teeth, tipped neighbours and overgrown opposing teeth in a single image. A CBCT scan shows the real height of the remaining bone and the difference in level between the two sides; it also helps with root fractures that do not show on an ordinary X-ray. But a fracture does not always leave a trace on imaging: if the CBCT scan is clear but the clinical signs persist, we keep monitoring the tooth.

What is done

The order is not random: first the cause pushing chewing to the other side is removed, then the damage built up on both sides is repaired. If it is done the other way round, the new work sits under the same force.

Treating the tooth you are avoiding

The job is not to silence the pain but to deal with its cause: correcting a surface left too high takes a few minutes, covering a crack with a crown takes one session, and root canal treatment for inflammation at the tip of the root takes a few sessions. Until this step is complete, chewing does not return to balance.

Cleaning the side that is not chewed on

Hardened tartar is removed with instruments, and if it has gone below the gum, the root surface is cleaned from inside the pocket. If the inflammation stayed in the gum, the tissue recovers within a few weeks; if it has reached the bone, this treatment stops the bone loss but does not bring back bone that has been lost.

Repairing the worn side and a night guard

Teeth that have become shorter are rebuilt with fillings or crowns, and cracks are covered to stop them moving; if you have a history of grinding your teeth at night, a protective night guard comes in. A repair made without stopping the force that causes the wear breaks down again in the same place.

Replacing missing teeth

If there are no teeth on one side to crush food with, chewing cannot go back there; the only solution is to close the gap. For a single missing tooth, standard implant treatment is enough. If many teeth are missing on one side or in both jaws, we deal with the whole mouth in a single plan: the implants lock mechanically into the hard outer layer of the jaw, the cortical bone. A conventional implant is placed in the alveolar bone at the top, which shrinks along with the teeth, and you have to wait months for its surface to fuse with the bone; because a strategic implant locks into the hard basal layer deeper down, it has its anchorage from the first day. This is where the difference comes from. Adding bone and months of waiting do not come into it, and at the end of three clinical days you leave with your final fixed teeth.

Learning to chew again

Once the cause has been dealt with, what is left is a learned habit, and it does not go away on its own; in the first weeks you need to deliberately move food to the side you have not been using. Because this step costs nothing, it is underestimated, yet it is what protects the result.

What happens if it is ignored

Because chewing on one side plays out over years, it seems harmless. The points below were written not to frighten you but so that you can ask the right question whichever dentist you go to.

The neglected side quietly reaches the point of no return

On the side where tartar builds up, the inflammation progresses without causing pain; once it reaches the bone, it can no longer be reversed. The first thing the patient feels is the teeth becoming loose, and by that stage part of the loss has already happened.

Enamel does not renew itself

Worn tooth tissue does not come back. The load on one side shortens the teeth, and once the dentine underneath is exposed, sensitivity to hot and cold begins. From this point on, what can be done is to stop the wear and put back the lost height with artificial material.

A crack grows while you wait

Every bite pushes the crack a little further down. A tooth that could be covered with a crown today and used for years moves onto the extraction list once the crack reaches below the gum. What makes the difference is not the quality of the treatment but when it is done.

The healthy side does not stay healthy for ever

Patients describe it as 'my good side', yet the good side is the side carrying the whole load. When a tooth on that side cracks, there is nowhere left to chew, because the other side has been neglected for years.

Waiting complicates the implant plan

The jawbone keeps its volume thanks to the chewing load it carries; in an area left without teeth, it gets thinner. Because a conventional implant anchors in the upper layer of the bone, the plan gains extra steps there as the bone diminishes: a graft, waiting, a second surgery. Because the protocol we use locks into the hard layer deep in the jaw, it does not go through these steps. But thinning bone also changes where the tooth will sit, the lip support and the bite; so you pay the price of waiting either way.

What to expect afterwards

The time it takes depends on why you chew on one side. The course below shows the path that starts with a cleaning and, if needed, ends with replacing missing teeth.

The first week after a cleaning
On the neglected side, tenderness and a little bleeding when you brush are normal; because the root surface that was under the tartar is now exposed, there is also some temporary sensitivity to cold. Do not stop brushing; clean that side regularly with a soft brush.
Weeks two to six
The gum firms up, the bleeding lessens and the colour evens out on both sides. At the end of this period we measure the gum again: if the bleeding has stopped, the inflammation had stayed in the gum and the matter is closed. If the pockets are still deep, the inflammation has reached the bone and we continue with gum treatment.
The first weeks: chewing returns to balance
Even after the cause has gone, for a while you need to consciously move food to the side you had stopped using; as the weeks go by this takes less effort and turns into habit. A slight tiredness in the muscles shows that the side that had not been working for a long time is coming back into use.
If missing teeth are to be replaced: three clinical days
In the protocol we use, the implants lock mechanically into the cortical bone, so adding bone and months of waiting do not come into it. Some swelling and tenderness are normal and ease after the third day. At the end of three clinical days you leave with your final fixed teeth and go back to chewing on both sides.

Message us right away if

Swelling, discharge or a fever on the side you do not chew on. These are signs of active infection and need to be assessed the same day. Call without waiting for your appointment.
A sudden restriction when you open your mouth. Your jaw suddenly catching, or how wide your mouth opens narrowing noticeably, usually means the disc inside the joint has slipped out of place; because muscle spasm and infection can cause a similar picture, an examination tells the causes apart. When it is assessed early, the solution is simpler.
You are still chewing on one side after treatment. Carrying on avoiding that side shows that the cause has not gone: a crack that was missed or a surface left too high. Both are sorted out in a single session, but for that you need to let us know.

What determines the cost

We do not give a single figure on this page: behind the same habit there may be a single cleaning session, or rebuilding a whole side with implants. We give you the right figure after the examination and a CBCT scan. Send us your X-ray and we will share the scope in writing. The items that determine the price:

The cause pushing your chewing to one side: A bite adjustment, root canal treatment, a crown and an implant are completely different procedures; their timescales and number of sessions differ too. A figure given before the cause is identified is bound to change at the clinic.
The state of the gums on the neglected side: Cleaning off surface tartar and cleaning the root surface from inside the pocket are separate jobs; the second is done area by area and over more than one session. What decides it is whether the inflammation is in the gum or in the bone.
How many teeth need repairing: On the side carrying the load, wear and cracks do not stop at one tooth. A plan built around a single tooth and a plan covering that whole side are costed separately.
The number of missing teeth and the bridgework: The number of implants and the material of the fixed teeth made on them directly affect the total. We share the brand of the material we use in writing from the outset.

Frequently asked questions

Can chewing on one side really make my face lopsided?

The chewing muscle is a muscle that develops as it works; while the side that is always working thickens, the other side does not get the same stimulus. With a habit of a few months, there is no difference you can see. Over years, a difference forms between the two halves of the face, and if a tooth has been missing on the same side for a long time, thinning of the bone makes this difference bigger.

Why is the side I do not chew on in worse shape? I never put any strain on it.

Not straining it is not the same as protecting it. Chewing, the tongue and the flow of saliva constantly break up plaque; this is part of the mouth's own cleaning mechanism. On the side that is not used, plaque is left undisturbed and hardens into tartar. While plaque is soft it comes off with a toothbrush; once it has turned into tartar it does not. The hardened layer is removed with instruments, and mouthwash does not dissolve it.

If I force myself to start chewing on the other side, will that solve the problem?

If the cause has gone, yes, that is exactly what is needed. But if there is a painful tooth or missing molars on that side, forcing it does not work; within a few days you find yourself back on the same side, and this time you also damage the painful tooth. The order is: first deal with the cause, then consciously turn the habit around.

Does it really affect my digestion?

Chewing is the first mechanical stage of digestion: it makes food smaller and mixes it with saliva. In people who chew on one side, food is usually ground less thoroughly; in some people this turns into complaints of bloating and a heavy feeling after meals. The effect becomes really noticeable in people with missing back teeth on one side: hard and fibrous foods drop off the menu and the diet shifts to soft foods.

I have no molars at all on one side. Can I carry on like this?

If you carry on, the whole load falls on the other side, and that side wears out faster every year. At the same time, the neighbouring teeth tip into the gap, the tooth in the opposite jaw grows into the space, the bite is thrown off and the bone thins in the area with no teeth. None of this can be undone; closing the gap is not a decision to put off.

Should I come to you because I chew on one side?

Not for this habit on its own, to be frank. The protocol we use is for the full mouth or many missing teeth. If what pushes your chewing to one side is a painful tooth, tartar or a single gap, the right place to go is your own dentist. If many teeth are missing on one side or in both jaws, this falls within our area; if we look at your X-ray and think it is not suitable for you, we tell you that in writing too.

Sources

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