Category: Tooth Pain & Symptoms

A swelling on the gum beside a tooth has two quite different possible origins, and they need opposite treatments. Getting the distinction right is one of the more consequential calls in dentistry.

Here is how a gum-origin problem differs from a tooth-origin one, the tests that separate them, and what happens when it turns out to be both.

Two different problems that look alike

Both produce swelling, tenderness, a bad taste and sometimes pus. What differs is where the infection began.

A periodontal problem starts in the tissues around the tooth — gum, ligament and supporting bone — usually where a deep pocket has trapped bacteria. The tooth itself may be entirely healthy inside.

An endodontic problem starts inside the tooth. The pulp dies, infection travels out through the root tip, and finds a route to the surface through the gum. The gum is where you see it, not where it began — our abscess guide covers that in detail.

How they differ in practice

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The tests that settle it

Pulp testing does most of the work. Cold is applied briefly and we watch how the tooth responds compared with its neighbours.

A normal response means a living pulp, which makes an endodontic origin unlikely. No response at all means a dead pulp, which makes it very likely. That single test resolves a large majority of cases in under a minute.

Probing adds the second half. A fine probe is walked around each tooth measuring the gum attachment. Generalised deep pockets across several teeth indicate periodontal disease; a single narrow deep track beside an otherwise healthy gum is usually an endodontic infection draining out.

What the gum tells you on its own

Some signs point at the gums before any test. Bleeding when you brush, gums that have receded across the mouth, visible tartar and persistent bad breath are features of periodontal disease rather than of one dying tooth.

Conversely, a single tooth that has been aching, is sensitive to hot, or has darkened, with healthy gums elsewhere, is telling you the problem is inside that tooth — see what sensitivity patterns mean and why a tooth darkens.

When it is both

Combined lesions exist, and they are the reason this distinction gets its own literature. An endodontic infection draining down the side of a root can create a pocket that then behaves periodontally; advanced periodontal disease reaching the root tip can compromise the pulp.

The practical rule is to treat the endodontic component first. A tooth with a dead pulp will not respond to periodontal treatment while the source is untreated, whereas resolving the pulp infection frequently allows the associated pocket to heal on its own. Reversing that order wastes months.

Why the distinction matters so much

The treatments have almost nothing in common. Periodontal disease is managed by cleaning below the gum, sometimes surgically, plus daily control at home — a long-term maintenance problem.

An endodontic infection is resolved by treating the inside of the tooth once. No amount of scaling reaches a dead pulp, and no amount of root canal treatment fixes a deep periodontal pocket.

Prognosis differs too. A tooth with an endodontic problem and healthy support has an excellent outlook. A tooth that has already lost most of its bone support has a poor one regardless of what is done inside it — which is one of the situations where extraction is the honest recommendation.

What each one actually needs

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The column that surprises people is the third row. Periodontal disease is controlled rather than cured, and how well it is controlled depends largely on what happens at home between appointments. An endodontic infection is dealt with once and does not come back if the tooth is properly restored.

What to do if you have a swelling now

Get it looked at rather than self-diagnosing. Both origins are treatable and both worsen if left, and the tests take minutes.

Go the same day if the swelling is spreading, you have a fever, or the area near your eye or throat is involved — that is covered in the emergency guide and applies whichever the origin. The American Academy of Periodontology’s information on gum disease covers the periodontal side in more depth.

Frequently asked questions

A surprising share of the cracked teeth we treat have no decay, no old filling and no accident behind them. The patient has simply been grinding, night after night, for years.

Bruxism is the most common cause of cracks that arrive with no obvious explanation. Here is how to recognise it, what it actually does to teeth, and what genuinely helps.

Why grinding cracks teeth and chewing does not

Teeth are built for chewing: short bursts of force, food between the surfaces, and saliva as lubrication. Grinding is none of those things.

It is tooth against tooth, with nothing in between, at forces well above normal chewing, sustained for long periods while you are asleep and have no protective reflex to stop. The result is fatigue failure — the same way metal eventually cracks under repeated loading rather than one big impact.

The signs, in the order people usually notice them

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The pattern that gives it away is symmetry. A single problem tooth is usually a single problem tooth; several teeth sensitive at once, worse in the morning, with aching jaw muscles, points at the muscles rather than at any one tooth — see what different patterns of bite pain mean.

What it does over time

The damage accumulates in a predictable order. Enamel wears first, exposing dentine, which is softer and wears faster — and which transmits temperature to the nerve, producing the generalised sensitivity described in our guide to hot and cold sensitivity.

Then structures start to fail. Cusps crack, restorations debond, and teeth already weakened by large fillings split. Where a crack reaches the pulp, the tooth needs root canal treatment; where it runs below the gumline, it usually cannot be saved at all — which cracks can be saved covers the distinction.

Why it is worth acting early

Wear is cumulative and nothing puts enamel back. A guard fitted while the signs are still soreness and sensitivity protects teeth that are structurally intact; the same guard fitted after two cusps have fractured is protecting teeth that already need crowns.

That difference is measured in thousands of dollars over a decade, which is the practical argument for taking morning jaw ache seriously rather than waiting for something to break.

What actually helps

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Beyond the guard, the drivers are worth addressing. Stress is the best-established one, and daytime clenching often responds to simple awareness — the resting position of your jaw should have your teeth slightly apart, not touching.

Sleep quality matters too. Poor sleep and sleep-disordered breathing are both associated with bruxism, so persistent grinding alongside snoring or daytime fatigue is worth mentioning to your doctor rather than treating as purely dental.

Daytime clenching is a separate habit

Sleep bruxism and awake clenching are related but not the same thing, and they respond to different approaches.

Awake clenching is postural and typically happens during concentration — driving, screen work, lifting. Because you are conscious, awareness genuinely works: a phone reminder, or a note on the monitor, is often enough to break it within a few weeks.

The check is simple. At rest, your lips should be together and your teeth slightly apart, with the tongue resting on the palate. If your teeth are touching as you read this, that is the habit.

What we look for

Grinding leaves a consistent signature, and it is visible long before anything cracks: flattened cusps that match between upper and lower teeth, polished shiny facets on the biting surfaces, scalloped indentations along the edges of the tongue, and a ridge of thickened tissue along the inside of the cheek at the bite line.

Children grind too, often noisily, and in most cases it resolves on its own as the adult teeth come through — see endodontics in children for when a child’s tooth genuinely needs attention.

If a tooth has already cracked

A guard prevents further damage but reverses nothing. A cracked tooth needs assessing on its own merits, and promptly — cracks propagate under exactly the load that caused them.

Where the crack has reached the pulp, root canal treatment followed by a crown is the usual route. The crown matters twice over here: it protects the treated tooth, and it protects it against a force that has not gone away.

Our tips for protecting your natural teeth cover guards and prevention, and the cracked teeth page explains what we look for. The NIH’s National Institute of Dental and Craniofacial Research publishes background on jaw and muscle disorders for the joint symptoms that often accompany grinding.

Frequently asked questions

Pain on biting is one of the more useful symptoms you can bring to a dentist, because the exact way it behaves narrows the diagnosis faster than almost anything else.

Whether it hurts pressing down or letting go, whether it is one tooth or several, and whether it started after dental work all point in different directions. Here is how to read it.

What the timing tells you

Pay attention to the exact moment it hurts. Patients often describe this precisely once asked, and it is genuinely diagnostic.

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Pain on release: the classic crack

This is the pattern worth learning. Chewing something firm produces a jolt not while you bite but as you let go — the crack closes and momentarily pinches the pulp.

It is often intermittent, food-dependent and hard to localise, which is why people put up with it for months. Cracks propagate under load, so a tooth that needs only a crown now may need considerably more later — which cracked teeth can be saved covers the five types and their prognosis.

Pain on pressure: the ligament

Each tooth is suspended in its socket by the periodontal ligament. When infection or inflammation from inside the tooth reaches the root tip, that ligament becomes inflamed and exquisitely pressure-sensitive.

The result is a dull, constant tenderness — the tooth may feel raised, as though it is hitting first. This is the pattern most often associated with a dying or dead pulp, and it can appear before anything shows on a radiograph. It also occurs after root canal treatment as normal healing, which our recovery guide covers.

Pain that started after dental work

This is the easiest cause to fix and the one people most often endure unnecessarily. A new filling or crown that sits slightly proud means that tooth contacts first, every time.

The ligament becomes bruised from the constant overload, and the tooth feels sore to bite on. Adjustment takes a minute or two, and if the pain resolves within days afterwards, that confirms the diagnosis. It is worth ringing whoever placed the restoration rather than waiting it out.

When it is clenching, not the tooth

If several teeth are tender, the pain is worse in the morning, and your jaw muscles ache, the cause may not be in any tooth at all.

Sustained clenching overloads the ligaments of multiple teeth at once. Nothing shows on a radiograph because nothing is wrong with the teeth — see how grinding damages teeth for what to do about it.

How it is diagnosed

The central test is simple: you bite on a small plastic wedge placed on one cusp at a time. A crack usually produces pain on one cusp specifically, and on release rather than pressure.

Percussion testing — light tapping — identifies ligament inflammation, and cold testing establishes whether the pulp is alive. Together these separate the causes above in a few minutes. Our guide to what temperature sensitivity means covers the pulp side.

What happens at the appointment

Diagnosis of bite pain is mostly clinical rather than radiographic, which surprises people expecting an X-ray to settle it.

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That last row is worth absorbing. A normal-looking X-ray does not rule out a crack or early ligament inflammation, and being told the film looks fine is not the same as being told nothing is wrong.

When to be seen quickly

Bite pain on its own justifies an appointment within days rather than hours. Cracks worsen under load and an inflamed ligament rarely settles unaided.

Move faster if there is facial swelling, fever, a bump on the gum, or pain that wakes you — those indicate infection reaching the bone, covered in our abscess guide and the emergency symptom list.

If a tooth has been sore to bite on for more than a week or two, an assessment is worth having — see what a consultation involves. The Merck Manual’s entry on pulpitis covers the underlying condition clinically.

Frequently asked questions

Upper back teeth that ache during a heavy cold are one of the most commonly misdiagnosed complaints in dentistry — in both directions. People have root canals they did not need, and sinus treatment that was never going to work.

The two problems sit millimetres apart anatomically. Here is how to tell them apart, and when it turns out to be both.

Why the confusion happens

The maxillary sinuses are air spaces behind your cheekbones. The roots of your upper premolars and molars push up into the floor of those spaces, occasionally protruding through it entirely.

Both are supplied by branches of the same nerve, and the brain is poor at distinguishing where pain within a shared nerve territory originates. That is the whole problem in one sentence.

Six ways to tell them apart

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The bending-forward test is worth doing deliberately. Lean down as if tying a shoelace and hold it for a few seconds. Sinus pressure builds noticeably; a tooth problem does not change.

The overlap nobody mentions

Real life is less tidy than the table above, and two situations blur it further.

The first is a genuinely coincidental pair. Sinusitis is common and toothache is common, and having both at once is not rare. If sinus treatment resolves the congestion but one tooth still aches, that remaining tooth deserves its own assessment rather than another course of decongestants.

The second is recent dentistry. An upper molar extracted or treated close to the sinus floor can leave a small communication between mouth and sinus, and sinus symptoms that begin within days of such a procedure should go back to whoever performed it.

In both cases the useful instinct is the same: treat the finding you can actually demonstrate, and re-examine rather than assume when symptoms only partly resolve.

When it is genuinely the tooth

Certain features effectively rule sinus out. If cold makes it worse and the pain lingers well after the cold is gone, that is pulpal — our guide to what hot and cold sensitivity means covers how to read it.

Sharp pain on releasing a bite suggests a crack. Pain that wakes you at night, or swelling of any kind, points firmly at the tooth and needs seeing quickly — see which symptoms are urgent.

When the tooth caused the sinusitis

This is the case most often missed. An infected upper molar can discharge directly into the sinus above it, producing genuine sinusitis with a dental cause — maxillary sinusitis of dental origin.

The pattern to watch for is one-sided sinusitis that keeps returning despite antibiotics or nasal treatment, often with an unpleasant taste or smell. Treating the sinus alone never resolves it, because the source is a tooth.

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Why guessing is expensive

Both errors happen, and both cost more than the assessment would have.

Treating a healthy tooth for sinus pain is irreversible. Root canal treatment on a tooth whose pulp was never the problem removes healthy tissue and leaves the actual pain untouched, which is how people end up having a second and third tooth treated in search of relief.

The reverse wastes time rather than tooth structure. Weeks of decongestants and antibiotics for what is actually an infected molar allow the infection to progress, and the tooth that could have been treated straightforwardly becomes an abscess with facial swelling.

Neither is a criticism of anyone. The presentations genuinely overlap, which is precisely why testing rather than reasoning settles it.

How the diagnosis is actually made

Testing settles it quickly. Cold testing shows whether the pulp is alive and how it responds; percussion testing shows whether inflammation has reached the ligament around the root.

A live, normally responding pulp on every upper tooth in the area effectively rules out a dental cause. Where the picture is unclear, 3D imaging shows the relationship between root tips and the sinus floor directly — see the imaging we use.

If you are unsure, an assessment is worth having before committing to either treatment path — see what a consultation involves and our guide to locating the source of tooth pain. UCLA Health’s overview of sinus infections disguised as toothache covers the same ground from the medical side.

Frequently asked questions

A single grey or brownish tooth among a row of lighter ones is one of the most self-conscious-making things a front tooth can do — and it is usually fixable without a crown.

Here is why treated teeth darken, why ordinary whitening will not touch it, and what actually works.

Why a treated tooth changes colour

When a pulp is injured or dies, blood breaks down inside the tooth and its pigments seep into the microscopic tubules that run through dentine. That staining is locked inside the tooth structure.

Two other contributors are worth knowing about. Pulp tissue left in the chamber during treatment continues to break down and stain, and some older root canal sealers — particularly grey ones — discolour dentine directly. Modern white and bioceramic sealers are much less prone to it.

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How long before it shows

Discolouration after trauma is rarely immediate. A tooth knocked at the weekend may look pink within days as blood enters the dentine, then return to normal, then darken gradually over the following months.

After root canal treatment the timeline is slower still. Where residual tissue or a staining sealer is responsible, the change usually becomes noticeable somewhere between six months and a few years afterwards, which is why people often do not connect the two.

Neither timeline changes the treatment. What it does change is the assumption that a tooth which looked fine after treatment must have a different cause — usually it does not.

Why whitening strips make it worse

This is the mistake we see most. Over-the-counter whitening works on the enamel surface, and the surrounding teeth respond well to it.

The treated tooth does not, because its stain is internal. The practical result is a wider gap in shade than you started with, and a tooth that now stands out more.

How internal bleaching works

The technique is straightforward. The access cavity is reopened, root filling material is sealed off with a protective barrier, and a bleaching paste is placed inside the pulp chamber.

A temporary filling seals it, and you leave with it working from the inside — hence “walking bleach”. At the next visit it is removed, the shade assessed, and either repeated or finished with a permanent restoration.

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If the tooth already needs a crown for structural reasons, the colour question resolves itself. Where the tooth is otherwise sound, removing healthy enamel purely for shade is a poor trade.

What affects how well it works

Colour matters. Brown and yellow stains respond well; grey, particularly from long-standing trauma, is less predictable and sometimes needs more applications.

Time matters too. A tooth that darkened last year responds better than one that darkened a decade ago, and the quality of the underlying root canal matters — a leaking or incomplete filling should be addressed first, which may mean retreatment before any bleaching.

What the appointment involves

The first visit is diagnostic rather than cosmetic. We check that the existing root filling is sound, because bleaching a tooth with a leaking canal simply delays a problem you will meet again.

Assuming it is, the access cavity is reopened and a barrier is placed over the root filling. This step matters: it protects the root from the bleaching agent, and skipping it is associated with resorption at the neck of the tooth years later.

The paste goes in, a temporary filling seals it, and you come back in about a week. Most people see a clear change after the first application, and we repeat it until the shade matches or stops improving.

The tooth is then restored permanently. Bonding immediately after bleaching is avoided for a few days, because residual peroxide interferes with how well composite adheres.

When a dark tooth means something else

Discolouration is not always cosmetic. A tooth that darkens without ever having been treated is telling you its pulp has died — often years after a knock that seemed minor at the time.

That tooth needs assessment rather than whitening, because a dead pulp eventually leads to infection at the root tip. If the darkening followed an injury, our guide to what happens after dental trauma explains why the pulp can fail long after the event.

If a front tooth has changed colour, it is worth having it looked at properly before committing to anything irreversible — see what a consultation involves. The NIH’s clinical review of internal tooth whitening covers the technique in detail.

Frequently asked questions

Sensitive teeth are so common that most people ignore them. But the pattern of sensitivity — hot or cold, how long it lasts, whether it lingers — is the single most useful diagnostic clue an endodontist has.

Two people describing “a sensitive tooth” can have completely different problems: one needing nothing more than a change of toothpaste, the other needing a root canal within the week. Here is how to tell them apart.

The 30-second rule

Endodontists lean heavily on one question: how long does the pain last after the trigger is removed?

Under about 30 seconds suggests reversible pulpitis — the pulp is irritated but can recover once the cause is treated. Longer than that, particularly if it builds rather than fades, suggests irreversible pulpitis, where the tissue cannot recover and root canal treatment becomes the realistic option.

What each pattern usually means

Sensitivity is rarely just “sensitivity”. The combination of trigger, duration and location narrows the diagnosis considerably, and the table below is roughly how we think through it.

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Why heat is the more worrying signal

Cold sensitivity is so widespread it tells you relatively little on its own. Heat sensitivity is different.

As a pulp dies, tissue breakdown produces gases inside a chamber with rigid walls and nowhere to expand. Heat expands those gases further, driving pressure against the nerve. That is why the pain is often delayed by several seconds and then builds — the opposite of an ordinary cold twinge.

Sensitivity that is not about the nerve at all

Plenty of sensitivity has nothing to do with the pulp. Receding gums expose dentine, and its microscopic tubules transmit temperature straight to the nerve. Enamel worn by acidic drinks or grinding does the same.

These respond well to desensitising toothpaste, typically within two to four weeks. The important caveat: if the toothpaste is not helping after a month, it is not that kind of sensitivity, and continuing to use it simply delays a diagnosis.

Two other everyday causes are worth ruling out before assuming the worst. A newly placed filling can leave a tooth reactive for a few weeks while the pulp settles, and whitening treatments commonly produce sharp, short-lived cold sensitivity that resolves on its own.

Night-time grinding is the one to take seriously, because it wears enamel and stresses teeth at the same time. It is a frequent precursor to the cracks described in our cracked teeth treatment page, and our tips for protecting your natural teeth cover guards and prevention.

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How we work out which tooth it is

Referred pain makes self-diagnosis unreliable. Upper and lower teeth on the same side share nerve pathways, so an upper molar problem is regularly reported as lower jaw pain.

We test several teeth to establish your normal response, then compare. Cold testing gauges whether the pulp is alive and how it reacts; percussion testing shows whether inflammation has reached the ligament around the root. Our guide to identifying the source of tooth pain covers this in more detail.

When to stop waiting

Book an assessment if sensitivity lingers past 30 seconds, if heat has become a trigger, if pain wakes you at night, or if you cannot pinpoint which tooth is responsible. None of those resolve by waiting, and each one gets harder to treat the longer it runs.

Go sooner if there is swelling, fever, or pain that over-the-counter medication no longer controls — those are covered in the signs that need same-day emergency treatment. If a crack is the suspected cause, which cracked teeth can still be saved explains what determines the outcome.

What treatment actually changes

If the pulp is the problem, root canal treatment removes the inflamed tissue and the sensitivity goes with it — there is nothing left inside the tooth to register temperature.

If it is exposed dentine instead, the fix is smaller and no root canal is involved. Either way the first appointment is diagnostic before anything else — see what to expect at your first visit, or the Merck Manual’s clinical entry on pulpitis for the underlying condition in technical detail.

Frequently asked questions

Whether a cracked tooth can be saved comes down to one thing: how far the crack travels. A chip off a cusp and a fracture running down into the root are the same word describing two completely different outcomes.

Endodontists classify cracks into five types. Knowing which one you have tells you almost everything about the prognosis — so that is where this guide starts.

The five types of cracked tooth

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Our cracked teeth treatment page covers what each type involves clinically. The pattern worth noticing is that prognosis depends entirely on whether the crack has reached the root.

How to tell what you are dealing with

The signature symptom is pain on release. Biting wedges the crack open; letting go snaps it shut and pinches the pulp inside for a fraction of a second.

Beyond that, the picture is frustratingly vague. Patients often describe discomfort they cannot localise, sensitivity that comes and goes, and pain triggered only by certain foods at certain angles. Symptoms that persist between episodes suggest the pulp is now involved — our guide to what hot and cold sensitivity reveals about the nerve explains how to read that.

Why your X-ray probably looks normal

This is the single most common source of confusion. Most cracks run in the same plane as the X-ray beam, so there is nothing for the film to capture.

Diagnosis therefore relies on physical testing:

• Bite testing on individual cusps to find which one reproduces the pain.
• Transillumination — shining light through the tooth, where a crack interrupts the glow.
• Dye staining to make a fine crack visible.
• Magnification under a microscope, which reveals cracks invisible to the naked eye.
• 3D imaging in selected cases, which can show bone loss patterns typical of a root fracture.

Treatment by crack type

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A crown is not cosmetic here. It binds the tooth so that biting forces are redirected around the crack instead of driving it deeper, which is why a temporary filling is not an adequate substitute.

Where the pulp is involved, the sequence matters: root canal treatment first, then the crown, and the crown should not be delayed. If a previously treated tooth cracks, endodontic retreatment or endodontic surgery may be considered, though a crack changes that calculation considerably.

Why waiting makes the decision for you

Cracks propagate. Every bite drives the fracture fractionally further, and the direction of travel is always toward the root.

That is what makes this genuinely time-sensitive. A cracked tooth treated promptly is often a crown and nothing more. The same tooth six months later can be a split tooth — and by then the choice has been made for you. If pain becomes severe or swelling appears, see which symptoms need same-day emergency care.

While you wait, chew on the other side and avoid hard or crunchy food — nuts, ice and boiled sweets are the usual culprits. A crack widens under load, so every firm bite on that tooth costs you options. If your dentist has already fitted a temporary crown or an orthodontic band, leave it in place; it is doing the same job a permanent crown will do later.

Sensible prevention helps too: our tips for protecting and saving your natural teeth covers night guards for grinding, which is the most common underlying cause we see.

Getting a straight answer about your tooth

Assessing a crack is exactly the kind of judgement general dentists refer for — the question is not what treatment exists but whether it will hold. See why an endodontist is the right specialist for a cracked tooth.

If the answer is that it cannot be saved, the alternatives to a root canal and what each costs long term lays out what comes next. Cleveland Clinic’s overview of cracked and fractured teeth is a solid independent reference. You can also contact our Charleston endodontic office directly.

Frequently asked questions