Tooth Cyst – Causes and Treatment

Last updated on: 5 Aug, 2026

Among the inflammatory conditions affecting the oral cavity, a dental cyst is a serious condition that requires professional diagnosis and treatment. In this article, we will look at what a dental cyst is, how it manifests itself, what causes it, and what modern methods are available for effective treatment.

What is a dental cyst?

A dental cyst is a pathological cavity located in the jawbone or around the crown of an unerupted tooth. It is a sac bounded by a connective-tissue capsule, lined internally with an epithelial lining and filled with a liquid or creamy substance. Most often, the contents are a pale yellow, viscous fluid rich in cholesterol crystals.

One of the insidious characteristics of this formation is that it can develop slowly and asymptomatically over months or even years. Many patients discover the presence of a dental cyst by chance, during a routine X-ray examination or during a visit to the dentist prompted by another dental problem.

Image: freepik

Types

Dental cysts are classified into two main groups according to their origin – odontogenic cysts (of dental origin) and non-odontogenic cysts (not related to the teeth). Understanding the different types is important for the correct diagnosis of a cyst and the selection of appropriate treatment.

The main odontogenic cysts include:

• Radicular cyst (periapical cyst) – the most common type. It develops around the tip of the root of a non-vital tooth, usually as a result of untreated periodontitis or poorly performed endodontic (root) treatment. It is more common in permanent teeth and occurs more frequently in the anterior region of the jaws.
• Follicular cyst – associated with unerupted teeth and develops around the crown of a retained tooth. It is most commonly found in the area of wisdom teeth and maxillary canines with delayed eruption. This type of cyst grows faster than a radicular cyst and is found predominantly in younger patients.
• Residual cyst – a variant of a radicular cyst that remains in the jawbone after tooth extraction, when the cystic formation was not completely removed during the extraction.
• Persistent cyst – a cyst that continues to exist or develops after treatment, often due to incomplete removal or inadequate cleaning of the cystic cavity.

Non-odontogenic cysts are less common and include various types of formations not directly related to the teeth. Correct identification of the type of cyst is essential for selecting the optimal therapeutic approach and for cyst prevention.

Symptoms and risk factors

One of the characteristics of dental cysts is that they are initially asymptomatic. In the early stages of development, patients rarely experience discomfort, which makes the early detection of cysts a serious challenge. Symptoms of dental cysts usually manifest at a more advanced stage or when the cyst becomes infected.

Swelling of the gums

A noticeable swelling in the area of the affected tooth, which may feel soft on palpation (touching). With larger cysts, the swelling is clearly visible on the face. The pain ranges from a dull ache when pressure is applied to a sharp, throbbing pain when the cyst becomes infected. Painkillers often have little effect on the pain.

Loosening of the tooth

As it grows, the cyst exerts pressure on the surrounding structures, which can lead to mobility of the affected or adjacent teeth and their displacement. The gums in the affected area become inflamed, reddened and sensitive, particularly when chewing.

Tooth abscess

If the cyst becomes infected, a purulent inflammation develops, manifesting as swollen gums, pain, a raised temperature and general malaise. Pus drains from the fistula. 

Discomfort is felt when chewing, along with tension or pain in the affected area, particularly when pressure is applied to the tooth. To surgically remove the accumulated pus, the abscess is drained via a small incision.

Risk factors

Certain conditions and habits increase the risk of developing a dental infection and subsequent cyst.

Risk factors include:

• Untreated tooth decay;
• Injuries to the teeth and jaw;
• Chronic infections in the oral cavity;
• Weakened immune system;
• Impacted (unerupted) teeth.

Poorly performed root canal treatment is also a significant risk factor.

Causes of dental cysts

There are various causes for the formation of a dental cyst.

Dental infection and inflammation

The most common cause of a cyst is a dental infection that reaches the periapical region (the tip of the root). When the dental pulp (nerve) dies as a result of deep caries or trauma, bacteria penetrate the root canals and cause chronic inflammation in the surrounding tissues. 

The body reacts by forming a protective capsule around the infected area, and this is how the cyst forms.

Poor-quality endodontic treatment

Improperly cleaned root canals, incomplete filling or bacteria left behind after endodontic treatment create conditions for a persistent cyst. Poorly filled canals allow microorganisms to continue to develop in the periapical area.

Image: freepik

Traumatic injuries

Physical injuries, such as a blow, fracture or strong pressure on the teeth, can lead to pulp necrosis. If the condition goes unnoticed or untreated, this creates the conditions for the development of an inflammatory process and a subsequent cyst.

Developmental abnormalities

Follicular cysts form due to abnormalities in tooth development and are associated with impacted or unerupted teeth, most commonly wisdom teeth.

How is the diagnosis made?

Diagnosing a cyst is a multi-step process that requires a professional approach and the use of modern dental equipment.

Clinical examination

The specialist carries out a thorough examination of the oral cavity, assessing the condition of the teeth and gums and checking for any swellings. 

X-ray

The main diagnostic method for identifying cysts. On an X-ray, the cyst appears as a well-defined, rounded or oval-shaped area of reduced density with clear borders, located near the tip of the tooth root. 

Computed tomography (CT)

Three-dimensional X-ray imaging allows for precise determination of the cyst’s dimensions, its relationship to important anatomical structures, and the extent of bone resorption.

Electro-odontodiagnostics (EOD)  

A test to determine the vitality of the tooth. In the presence of a radicular cyst, the affected tooth does not respond to an electrical stimulus.

Histological examination

Following surgical removal of the cyst, the tissue is sometimes sent for histopathological analysis to determine the exact type of lesion and to rule out malignant disease.

How does the preparation for treatment proceed?

Before proceeding with treatment, the specialist carries out careful preparation, which includes a full diagnostic assessment and checking whether the tooth can be saved through conservative treatment or whether extraction is necessary.

When planning the treatment approach, a choice is made between endodontic and surgical treatment of the cyst, depending on the clinical picture. If there is an active infection or an abscess on the tooth, antibiotics are prescribed prior to surgical intervention to bring the condition under control.

What treatment methods are available for a dental cyst?

Treatment of a cyst involves either a conservative approach or surgical methods to remove the cyst.

Conservative treatment

For small radicular cysts (up to 1 cm) and when the tooth can be preserved, conservative treatment is used. This approach involves root canal treatment – careful cleaning and disinfection of the root canals, removal of the infected pulp and filling with antibacterial medication. 

Special pastes are placed in the canals to provide prolonged antibacterial action and stimulate bone regeneration, and once the infection is under control, the canals are permanently filled with biocompatible materials.

Surgical treatment methods

For larger cysts, persistent lesions, or when conservative treatment is ineffective, various surgical treatment methods are employed. Some modern techniques involve the use of bone substitutes and membranes for guided bone regeneration, which significantly improves outcomes and shortens the recovery period.

Are there any complications or risks?

An untreated dental cyst can lead to serious complications.

The most common complications include:

• Infections and abscesses;
• Tooth displacement and loss;
• Damage to nerve structures;
• Sinusitis.

In severe cases, the infection may spread to adjacent tissues or bones, or even cause a systemic illness (sepsis).

Post-operative care and recovery period

Successful recovery following cyst surgery depends on strict adherence to post-operative care recommendations. During the first 24–48 hours, cold compresses are applied to reduce swelling, and hot foods and drinks are avoided. For long-term monitoring of cysts, follow-up examinations are scheduled, including annual check-ups to monitor bone regeneration.

Conclusion

A dental cyst is a serious dental condition that requires timely diagnosis and professional treatment. The early recognition of the various symptoms of cysts through regular dental check-ups and X-ray examinations is crucial for preventing complications and preserving teeth.

Timely prevention of dental problems through regular check-ups, professional hygiene, prompt treatment of cavities and high-quality endodontic treatment are the best ways to prevent dental cysts. 

At Dentatime Clinic, we have an experienced team of specialists and state-of-the-art equipment for diagnosing cysts and providing high-quality treatment. Our personalised approach to each patient and attention to detail guarantee successful treatment and the long-term preservation of your oral health.

Frequently asked questions

Can a dental cyst disappear on its own?

No, dental cysts cannot disappear spontaneously without treatment. They require professional therapeutic or surgical intervention for their complete removal.

Is there a risk of the cyst recurring after treatment?

With proper treatment and complete removal of the cystic capsule, the risk of recurrence is minimal. Regular check-ups are important for the early detection of any potential problems.

Can the development of a cyst be prevented?

Yes, through good oral hygiene, regular dental check-ups, timely treatment of tooth decay and high-quality endodontic treatment, the risk of developing dental cysts can be significantly reduced.