Tooth Infection Swelling

If your face is swollen, or you are dealing with tooth pain that will not respond to painkillers, you are in the right place.

Many patients tell us they waited because they were not sure if it was serious enough to call. If you are reading this page, it is worth having it assessed.

Tooth infections are one of the most common reasons patients contact our office. They are treatable. The earlier we see you, the more options you have.

Call (905) 545-4833 now. We prioritise emergency appointments and can often see you the same day.

A tooth infection develops when bacteria breach the tooth's natural defences, the enamel and dentine layers that normally keep bacteria out. Once bacteria reach the inside of the tooth, the body walls off the infection, creating a pocket of pus that causes pressure, swelling, and pain.

We see three main pathways at our practice, in this order of frequency:

1. Untreated decay reaching the nerve. When a cavity goes deep enough, bacteria reach the nerve tissue inside the tooth. The nerve dies, and infection develops at the root tip. This is the most common pathway to a tooth infection at our practice.

2. A cracked tooth allowing bacteria below the gum line. Every time you bite down on a cracked tooth, the pressure pushes bacteria deeper into the crack. When you release, it pulls them back, but a little further each time. This cycling action allows bacteria to reach areas your body cannot clean on its own.

3. Advanced gum disease creating deep pockets. When gum disease progresses, it creates deep pockets around the teeth where bacteria accumulate and thrive. These pockets can become a source of infection that affects the tooth from the outside in.

There is also a fourth pathway we look for: failing restorations. When a filling or crown breaks down at the margin, bacteria can extend underneath and reach the nerve. This is one of the reasons we check the edges of every existing restoration during an assessment.

It matters which kind of infection you have, because the treatment pathway is different. Tooth infections fall into two clinical categories that look similar from the outside but begin from different places.

A periapical infection starts INSIDE the tooth. Bacteria reach the nerve through decay, a crack, or a failing restoration, the nerve dies, and the infection spreads from the root tip into the bone.

A periodontal infection starts OUTSIDE the tooth. Bacteria sit in a deep gum pocket and produce an abscess in the gum tissue that surrounds the tooth root.

Some patients have both at once. Some have only one. We use a defined sequence of tests to identify which pathway is producing the infection, so the treatment addresses the actual source, not just the symptom. We call this The Bacterial Tracking Sequence, and it is the first step of every emergency assessment at our practice. The sequence runs four checks: thermal pulp testing to see whether the nerve is alive, percussion testing to find the source tooth, palpation of the gum to locate the swelling, and periapical x-rays to show infection and bone loss at the root tip.

Once bacteria reach the centre of a tooth, your body's immune system cannot access them. The blood vessels that used to supply the tooth have been destroyed by the infection. The bacteria are sealed inside a chamber that neither your immune system nor antibiotics can penetrate. We call this the Sealed Chamber Principle, and it is the single reason this condition cannot resolve without intervention.

Antibiotics can slow the spread. They cannot eliminate the source. The infection returns until the source is physically removed. The only way to resolve it is to either clean out the inside of the tooth, which is root canal treatment, or remove the tooth entirely.

Understanding this is the single most important thing you can take away from this page. It explains why waiting does not work, why the infection comes back after antibiotics, and why the treatment your dentist recommends is the only path to resolution.

Tooth infections do not resolve on their own. They follow a predictable path, and the further along that path, the more complex the treatment becomes.

Stage 1, Early (Contained Infection)

The infection is localised to the root tip or gum pocket. Pain may be intermittent. Bone loss at the root tip has begun but remains limited. At this stage, the tooth can almost always be saved with root canal treatment. The surrounding structures remain intact at this stage. Treatment is straightforward, and recovery is predictable.

Stage 2, Accelerating (Spreading Infection)

The infection breaks through the bone at the root tip or spreads through accessory canals. Swelling becomes visible. Pain may intensify. Or, misleadingly, it may stop entirely.

When tooth pain stops suddenly, it does not always mean the problem is gone. If that happens, it is important to call our office so we can assess it properly.

This is one of the most dangerous misreads in dentistry. When pain eases or stops, patients often assume the body has handled it. Bone loss accelerates around the root in exactly this window. Saving the tooth becomes more complex and less predictable. If the tooth was cracked, the crack may have extended further during this stage, potentially making the tooth unrestorable.

Some patients in this stage develop a small bump on the gum that drains intermittently. The drainage often reduces the pain. We call this presentation The Continuous Drainage Sign. It is not a sign of healing. It is a sign that the infection has found a path out of the bone, and the source is still inside the tooth. If you have noticed a recurring pimple on your gum, especially one that drains and reduces your pain, that is a reason to call us, not a reason to wait.

Stage 3, Terminal (Systemic Threat)

The infection has destroyed enough supporting structure that the tooth cannot be saved. Extraction is required. In severe cases, infection spreads to the spaces of the head and neck, conditions that may require hospital admission, intravenous antibiotics, and surgical drainage.

Replacing a lost tooth with an implant involves bone grafting, multiple surgical appointments over several months, and substantially higher treatment complexity and cost. The difference between treating at Stage 1 and treating at Stage 3 is the difference between one procedure and several.

Right now, the infection is still contained and the tooth is still yours to save. That gives us the simpler way back, clearing it while the tooth can still hold its place and its work. Once the infection moves into the bone, that option closes. The path back becomes longer, harder on the support around it, and harder on you. That is why we walk you through what each path really costs before you choose, not after.

Tooth infection pain is often poorly localised. The tooth that hurts is not always the source. We run a defined sequence of tests so we know which cause we are treating, and we record what we find so you can see it yourself. We call this discipline The Bacterial Tracking Sequence.

The Objective Condition Record. We use iTero Lumina 3D scanning to create a detailed visual of exactly what is happening. You will see the condition on screen with us, so there are no surprises and no uncertainty.

Periapical x-rays show us the bone around the root tip, where infections develop and where bone loss occurs. Combined with thermal pulp testing, percussion testing, and palpation of the gum, these tools form the four-test discipline that identifies the source tooth, the entry pathway, and the extent of bone involvement before treatment begins.

This is not guesswork. You will see what we see, and we will explain what it means before any treatment decisions are made.

Step 1, Assessment

When you call with symptoms of an infection, we prioritise getting you in quickly, often the same day. Your appointment begins with a focused examination, diagnostic x-rays, and The Bacterial Tracking Sequence to identify the source and entry pathway of the infection.

Step 2, Diagnosis and Scan

We create an Objective Condition Record using iTero Lumina 3D scanning. You will see the condition on screen with us, so there are no surprises.

Step 3, Relief and Treatment Plan

If you are in pain, our first priority is getting you comfortable. We will explain what is causing the infection, what your treatment options are, and what happens next. If treatment can begin the same day, we will discuss that with you. If the infection needs to be controlled first with antibiotics before definitive treatment, we will explain why and schedule your next visit.

After treatment: The First 72 Hours Timeline

We provide clear recovery milestones for the first three days after treatment, including what to expect, what is normal, and what should prompt a call back to our office. Century Stone's Aftercare Guide covers the Soft Food Window, pain management, fever thresholds (above 38.5 degrees Celsius warrants a call), and escalation criteria.

When a crown is needed: The Permanent Protection Principle

A tooth that has had root canal treatment has lost its internal blood supply and becomes more brittle over time. A crown provides the structural protection needed to keep the tooth functioning long-term. This is not an upsell. It is the clinical standard for protecting a tooth that has been saved from infection.

Is this an emergency? Use this checklist.

Call (905) 545-4833 immediately if you are experiencing any of the following:

• Visible swelling in your face, jaw, or neck.
• Pain that does not respond to over-the-counter painkillers.
• Pain that stopped suddenly after a period of severe pain.
• Fever associated with dental symptoms.
• Difficulty swallowing or breathing.
• A recurring bump on your gum that drains fluid.
• A tooth that feels loose when it was previously stable.

If you are unsure, call anyway. Our team will help you determine the right next step. It is always better to check than to wait.

When we find a tooth infection, we also check for the conditions that caused it, because treating the infection without addressing the cause means it is likely to return.

If the infection started from a crack: A cracked tooth is the pathway that allowed bacteria to reach the nerve. Grinding and bite forces are what created the crack in the first place. Addressing the bite environment, through a night guard or bite correction, protects against future cracks and future infections.

If the infection started from decay: We assess whether dry mouth, dietary factors, or medication side effects are accelerating decay. Managing the environment that produced the cavity reduces the risk of it happening again.

If the infection started from gum disease: We assess whether crowding, alignment issues, or cleaning access are contributing to the periodontal condition. In some cases, orthodontic correction addresses the root environment.

Untreated pulpitis becomes abscess. Pulpitis is what happens when the nerve inside the tooth is inflamed but the chamber is still sealed. Abscess is what happens when the nerve dies and bacteria escape the chamber into surrounding bone.

Silent phase can end in an abscess. A tooth in the silent phase has stopped sending pain signals because the nerve has died. The infection that follows can be the first clinical sign that the silent phase has ended.

Untreated abscess becomes apical periodontitis. When the body cannot resolve the acute infection but cannot fully wall it off either, the condition becomes chronic. The bone loss continues quietly.

When an infection is not treated, the body can start breaking down the bone around the tooth. This can happen quietly, without obvious symptoms at first. That is why early assessment matters.

Adjacent teeth are assessed for early signs of involvement. The connections between conditions are what make the difference between treating a single problem and preventing the next one.

The endo-perio intersection. In some cases, infection from inside the tooth and infection from gum disease share the same tooth simultaneously. Bacteria migrate through whichever pathway offers least resistance. When this happens, treatment must address both sources. Treating one while ignoring the other allows the infection to persist. This is a connection no other resource explains, and it changes the treatment approach significantly.

We can fix what is broken. But if we do not change what broke it, the same thing will happen again, and next time, there is less tooth to save.

We drained the infection and saved the tooth. But the bacteria entered through a pathway, a crack, a failing filling, deep decay. If that pathway is not sealed and the conditions that created it are not changed, the bacteria will find their way back in. Not if. When.

Recovery from a tooth infection is not a single moment. It is a pattern across time. We look at three things together.

What your body is telling you, day by day. Pain easing, swelling reducing, function returning, the gum tissue settling. We pay attention to the direction of change, not to any one symptom on any one day.

What the trend looks like across the first week. Each day better than the day before is the healing signature. A single tender day is not a verdict. A worsening pattern over two or three days is a reason to call.

The cumulative trail of evidence, the footprints in the sand. Your scans, your symptoms, and your bite leave a trail your body draws over time. Healing leaves a trail. So does an infection that has not been fully resolved. That is what we watch for.

If anything in your recovery does not match this pattern, call (905) 545-4833. Day-by-day check-ins are what we are here for.