What is a dental abscess?

Last updated on: 5 Aug, 2026

When it comes to serious dental problems, a dental abscess is one of the conditions that requires immediate professional help. 

It is an acute or chronic inflammatory condition that not only causes intense discomfort but can lead to significant health complications if not treated promptly.

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Definition of a dental abscess

A dental abscess is a concentrated collection of pus that develops as a result of a bacterial infection in the tooth. It is a purulent infection in which the body localises the bacteria in a confined area, creating a pocket of pus. 

The process develops when pathogenic microorganisms penetrate various parts of the tooth structure or surrounding tissues, causing acute inflammation and a build-up of pus. 

Depending on its location, the infection may affect the tissues around the root tip, the periodontal tissues or just the gum, with each type requiring dental treatment with a therapeutic approach.

Main types of dental abscesses:

• Periapical abscess – forms at the tip of the tooth root and is the most common type, usually arising from untreated caries or trauma.
• Pericoronal abscess – occurs around the crown of a partially erupted tooth, most commonly in wisdom teeth.
• Periodontal abscess – affects the tissues surrounding the tooth and is associated with periodontal disease. 
• Gingival abscess – this is more superficial and is confined to the soft tissues of the gums, without affecting the periodontal ligament or bone. 

Each of these types can cause significant discomfort and requires a different therapeutic approach from the dentist.

Causes of a dental abscess

The development of an abscess is always the result of bacteria entering the dental structures or the surrounding area. This can occur in various ways, each of which creates the conditions for a purulent infection to develop. There are several main causes of this condition.

Tooth decay

Untreated tooth decay is the leading cause of periapical abscesses. As decay progresses deeper into the tooth, bacteria reach the pulp – the soft tissue containing nerves and blood vessels. 

This leads to inflammation and subsequent necrosis of the dental nerve. If root canal treatment is not carried out in a timely manner, the infection continues to spread through the root canals to the tip of the root, where a pus-filled pocket forms. The process can continue for months, gradually destroying the surrounding bone.

Periodontitis

Periodontitis is an inflammation and destruction of the tissues that support the teeth. In this condition, deep periodontal pockets form between the tooth and the gum, in which bacteria and tartar accumulate. 

These pockets create an ideal environment for the development of a periodontal abscess. If left untreated, gum inflammation can progress to a chronic form, in which the bone tissue around the tooth is destroyed. The periodontal infection may flare up periodically, leading to the formation of abscesses.

Tooth injuries

Mechanical damage to the teeth creates a direct route for bacterial penetration. A fracture, crack or strong impact can compromise the enamel and dentine, allowing microorganisms to reach the internal structures. 

Even in the absence of a visible fracture, the trauma can damage the blood vessels of the pulp and lead to its necrosis. In such cases, the tooth becomes vulnerable to infection, which may develop even weeks or months after the initial injury.

Other factors

There are also additional circumstances that predispose the development of an abscess. Improperly placed or old fillings may lose their seal and create gaps through which bacteria can enter the tooth. 

Poor oral hygiene leads to the build-up of plaque and tartar, which act as reservoirs for pathogenic microorganisms. A compromised immune system also plays a role, as the body finds it harder to fight off infections. 

Dry mouth, certain medications and unhealthy eating habits further increase the risk of developing dental abscesses.

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What are the symptoms of a dental abscess?

Recognising the various symptoms of an abscess is important for seeking dental care in good time. The clinical picture is usually clear, with symptoms developing gradually or suddenly, depending on the severity of the infection.

The most common symptoms are:

• Pain is the most characteristic and distressing symptom of an abscess. It is usually intense, throbbing and constant, and may spread to the ear, jaw or neck. The pain worsens when chewing, applying pressure to the tooth or when lying down.
• Facial swelling is one of the visible signs of an abscess, indicating that the infection has spread to the soft tissues. The swelling may affect the cheek, the area under the jaw or around the eye, depending on the location of the abscess.
• Redness and swelling of the gums are early indicators of an inflammatory process. The gums become sensitive to touch, may bleed and appear swollen.
• Tooth sensitivity to hot and cold stimuli is less common. Patients report a sharp, piercing pain when biting down.
• Bad breath and an unpleasant taste in the mouth occur when the abscess bursts and pus begins to drain into the oral cavity. This is a characteristic sign of an abscess that cannot be masked by oral hygiene products.
• Swollen lymph nodes under the jaw or on the neck indicate that the body is fighting the infection. They become painful to the touch and increase in size.
• A high temperature and general malaise may accompany severe cases, indicating that the infection is causing a systemic reaction in the body.
• Difficulty chewing and swallowing occurs when the infection spreads to surrounding tissues, particularly when the abscess is in the lower jaw.

The pain caused by the initial pulpitis may suddenly disappear, as the nerve has become completely necrotic. This temporary subsiding of the pain is dangerous because it does not mean that the infection has cleared up. 

On the contrary, it continues to develop, leading to the formation of an abscess and the destruction of surrounding tissues. Therefore, you should not delay visiting the dentist, regardless of whether you are in pain or not.

What are the methods of diagnosis and treatment?

Professional diagnosis of a dental abscess is based on a clinical examination and further tests. The dentist treats the abscess with the aim of eliminating the infection and preserving the tooth where possible. 

Tooth extraction is a last resort, used when the tooth is too badly damaged to be saved by root canal treatment or when the root canals are blocked. 

After extraction, the abscess is cleaned out and the area is carefully treated. Antibiotic treatment may be required to aid full healing of the wound and prevent the spread of infection. 

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Is it possible for complications to arise?

An untreated dental abscess poses serious health risks. Possible complications include osteomyelitis – an infection of the jawbone, which is extremely painful and difficult to treat. 

The spread of the infection to surrounding areas can lead to extensive purulent inflammation, which spreads rapidly through the soft tissues of the face and neck and can be life-threatening. 

One of the most dangerous possible complications is sepsis – a generalised blood infection in which bacteria spread throughout the body via the bloodstream. 

This is a life-threatening condition that requires immediate hospitalisation and intensive care. The infection can also reach the brain and cause meningitis or a brain abscess.

Final thoughts

A dental abscess is a serious dental condition that requires immediate professional intervention, and modern dental treatment offers effective methods for managing the infection.

The most important thing is not to ignore the symptoms and not to delay seeing a specialist. Even when the pain subsides temporarily, the infection continues to develop and can lead to serious health problems. 

Timely prevention of an abscess through good oral hygiene, regular check-ups and professional cleaning is an effective way to protect the health of your teeth.

Frequently asked questions

How long does it take to treat a dental abscess?

The duration of treatment depends on the severity of the infection and the method chosen. Root canal treatment may require more than one visit, and full recovery can take several weeks.

Can a dental abscess clear up on its own?

A dental abscess never goes away on its own, although the pain may sometimes subside temporarily due to nerve necrosis, but the infection continues to spread.

Can home remedies cure a dental abscess?

Home remedies such as rinsing with salt water may temporarily relieve symptoms, but they cannot cure the infection. A visit to the dentist for proper treatment is essential.