Tooth Abscess: Symptoms, Treatment, and When to Act

A dental abscess is a bacterial infection inside or around a tooth. It does not resolve on its own. Left untreated, the infection spreads, and what starts as manageable tooth pain can become a genuine medical emergency. If you have throbbing pain, swelling in your jaw or cheek, or a small bump on your gum, these are signs you need to see a dentist soon.

What Is a Dental Abscess?

An abscess is a pocket of pus caused by a bacterial infection. In dentistry, there are two main types.

A periapical abscess forms at the tip of the tooth root, usually when bacteria from an untreated cavity or cracked tooth reach the pulp, the inner nerve and tissue of the tooth. This is the most common type.

A periodontal abscess forms in the gum tissue beside a tooth, often related to gum disease or a trapped food particle. Both types require professional care, but treatment approaches differ.

Symptoms of a Dental Abscess

Not everyone has the same experience. Some abscesses are surprisingly quiet until they are well established. Common signs include:

• Severe, throbbing toothache that may radiate to your ear, jaw, or neck

• Sensitivity to hot, cold, or pressure that does not fade after the source is removed

• Swelling in the cheek, jaw, or lymph nodes in the neck

• A small raised bump on the gum near the tooth, called a fistula, which may drain fluid

• Persistent bad breath or a bitter taste

• Fever

A fistula that appears to drain on its own does not mean the problem has resolved. It means the infection has found an exit route. The source is still active.

Is a Dental Abscess a Dental Emergency?

In most cases, yes. An abscess causing significant pain, visible swelling in the face or jaw, or a fever requires urgent dental attention. Do not wait to see if it gets better on its own.

Call your dentist the same day. If the office is closed, look for an emergency dental clinic in the GTA. Go to an emergency room if you have any of the following:

• Difficulty swallowing or breathing

• High fever with swelling spreading toward your throat or neck

• Extreme difficulty opening your mouth

These are signs the infection may be spreading beyond the tooth and into the surrounding tissue, which becomes a serious medical situation requiring immediate care.

What Happens If a Dental Abscess Is Left Untreated?

The infection will not clear on its own. Bacteria continue to multiply and the infection spreads into the jawbone, adjacent teeth, and soft tissue. In severe cases the infection can reach the neck, airway, or bloodstream, a condition called sepsis. This trajectory is rare but real, and entirely preventable with timely treatment.

Our post on what happens when a cavity goes untreated walks through how tooth decay progresses into exactly this kind of infection when it is ignored long enough.

How Dentists Treat a Dental Abscess

Treatment depends on the type and severity of the abscess. The goal is always to eliminate the infection and preserve the tooth where possible. Your dentist will review your X-rays and recommend the right approach.

Root canal. When the tooth is salvageable, a root canal removes the infected pulp, cleans and seals the canals, and preserves the tooth. It is the most common definitive treatment for a periapical abscess.

Incision and drainage. For large abscesses with significant swelling, the dentist makes a small incision to drain the pus and relieve pressure. This is often done alongside root canal treatment or extraction rather than as a standalone cure.

Antibiotics. Prescribed when infection is spreading or a fever is present. They manage systemic spread but do not drain the abscess or fix the underlying tooth problem. Antibiotics are a bridge, not a cure.

Tooth extraction. When the tooth cannot be saved, extraction removes the source of infection entirely. Tooth replacement options such as implants or bridges can be discussed after you have healed.

Most patients who take antibiotics without following up with dental treatment find the abscess returns. Antibiotics alone are not a solution.

If the tooth can be saved, a root canal is usually the recommended path. Our post on root canal treatment and what to expect explains the procedure in detail for patients who are nervous about that option.

What to Do Before You Reach the Dentist

If you have an abscess and cannot see a dentist immediately, these steps can help manage discomfort in the meantime:

• Take an over-the-counter anti-inflammatory such as ibuprofen to manage pain. Follow the package instructions.

• Rinse gently with warm salt water several times a day.

• Avoid hot foods and drinks on the affected side.

• Do not press or squeeze the abscess.

• Call your dentist's emergency line to get on the schedule as soon as possible.

These steps provide temporary relief only. They do not treat the infection.

Frequently Asked Questions

Can a tooth abscess go away on its own?

No. The infection will not resolve without treatment. A fistula that drains may reduce pressure temporarily, but the source of the infection remains active. You still need to see a dentist.

How quickly does a dental abscess develop?

It varies. Some develop over days from an acute infection. Others build slowly from chronic decay present for months. Pain level is not a reliable indicator of severity. Some serious abscesses cause surprisingly little discomfort.

Will the dentist have to pull the tooth?

Not necessarily. The goal is to save the tooth when possible. Whether extraction is needed depends on how much damage the infection has done to the root and surrounding bone. Your dentist will assess this with X-rays at your appointment.

Does the Canada Dental Care Plan cover abscess treatment?

Eligible CDCP patients may have coverage for abscess-related treatment including drainage, extractions, and basic restorative work. Coverage depends on your household income. Confirm your specific coverage with the clinic when you book.

Tooth pain and swelling should not be ignored. If you have any of the symptoms above, contact Lornview Dental today and we will get you seen quickly. Schedule an appointment with Lornview Dental.