Dental abscess: symptoms, types, treatment and when a swollen cheek needs emergency care

What is a dental abscess and what causes it?

A dental abscess is a build-up of pus caused by a bacterial infection, most often at the root tip of a tooth whose pulp has died. The 2026 Scottish SDCEP guidance describes an acute apical abscess as a further stage of inflammation around the root tip, in which infection produces a pus-filled swelling.

The NHS lists tooth decay and gum disease, an impacted tooth, injury to a tooth, gum or mouth, radiotherapy and chemotherapy among its causes. A typical sequence is straightforward: a deep cavity lets bacteria reach the pulp, the pulp dies and infection passes from the root canal into the bone around the root tip.

In everyday Polish, an abscess with a swollen gum and cheek is often called “zapalenie okostnej” (periostitis). This refers to the periosteum, the thin membrane covering the jawbone, but clinical records usually describe the type of abscess and the tooth it started from.

What types of dental abscess are there?

Dental abscesses are classified by where pus collects: at the root tip, in a periodontal pocket or in the gum over a partly erupted tooth. The type determines how the dentist drains it and what happens to the tooth afterwards.

The table summarises common forms based on SDCEP guidance. Infection spreading beyond the tooth into the tissues of the face or neck is a separate, dangerous situation: the MSD Manual directs these patients to a hospital emergency department and an oral and maxillofacial surgeon.

What are the symptoms of a dental abscess?

A dental abscess most often causes severe toothache or gum pain, swelling and an unpleasant taste. According to SDCEP, acute abscess pain usually affects one tooth and increases quickly, while swelling of the gum, face or neck means infection is spreading.

For children and young people under 16, SDCEP also highlights listlessness, weakness and loss of appetite. An abscess can also be chronic, with little or no pain: pus drains through a small channel, a sinus tract, onto the gum surface, where a pimple appears. A separate article on a lump on the gum describes this.

The list brings together the symptoms given on the NHS dental abscess page. Not all need be present; diagnosis depends on examination and an X-ray of the tooth.

• Severe tooth or gum pain, often worse when biting.
• Redness inside the mouth or on the face and an unpleasant taste.
• Sensitivity to hot and cold food and drinks in the painful area.
• Difficulty opening the mouth and chewing.
• Swelling of the face or jaw: a swollen cheek from a tooth infection.
• Swollen glands in the neck and a high temperature.

When does a dental abscess need emergency hospital care or a call to 112?

A dental abscess requires emergency hospital care or a call to 112 when swelling starts to affect breathing, speaking or swallowing, because infection may block the airway. The NHS also lists a swollen or painful eye, sudden vision problems, extensive swelling inside the mouth and inability to open the mouth, and advises against driving yourself in these circumstances.

The most dangerous complication is Ludwig’s angina, a rapidly spreading infection of the floor of the mouth. A 2021 review by Bridwell et al. reports that it is more common with neglected teeth or reduced immunity and requires airway protection, broad-spectrum antibiotics and surgical removal of the source of infection.

Fever with increasing facial swelling, but no breathing difficulty, requires urgent dental care the same day. The list covers symptoms that mean going to an emergency department or calling 112 rather than waiting for a dentist.

• Difficulty breathing, wheezing or a changed, muffled voice.
• Trouble swallowing or speaking.
• Swelling around the eye, eye pain or sudden deterioration in vision.
• Extensive swelling inside the mouth, a firm, raised floor of the mouth or swelling beneath the lower jaw.
• Inability to open the mouth.

How does a dentist treat a dental abscess?

A dentist treats an abscess by draining pus and removing the source of infection: a tooth with infected pulp needs root canal treatment or extraction, while a periodontal abscess needs pocket cleaning and gum treatment. The NHS describes drainage under local anaesthesia; the 2026 SDCEP guidance recommends starting through the tooth where possible, and incising a palpable, fluctuant swelling as soon as possible.

A periodontal abscess is drained through the gum pocket or an incision. For a baby tooth, SDCEP states that drainage is not usually performed and extraction is the first option.

The MSD Manual states that incision in a dental surgery is inappropriate when infection spreads rapidly with high fever and a fast pulse, or when the airway is threatened. Such patients are assessed in an emergency department; an oral and maxillofacial surgeon drains the abscess, often through the skin.

• Assessment of the airway and systemic symptoms such as fever.
• Examination and an X-ray to identify the tooth where the abscess began.
• Local anaesthesia and opening the tooth or incising the abscess to drain pus.
• With infected pulp, irrigation of the canals with a disinfectant and a sealed dressing: SDCEP advises against leaving the tooth open.
• At a subsequent visit, completion of root canal treatment, periodontal treatment or extraction of a tooth that cannot be saved.

Are antibiotics enough for a dental abscess?

Antibiotics alone cannot cure a dental abscess because they do not remove pus or the source of bacteria, such as infected pulp or a deep gum pocket. The American Dental Association (ADA) 2019 guideline recommends prioritising dental treatment and using antibiotics for systemic symptoms such as fever or feeling unwell, or a high risk of developing them.

SDCEP allows antibiotics for signs of spreading infection, such as facial or neck swelling, systemic infection and reduced immunity. Even then, antibiotics supplement drainage rather than replace it; a clinician chooses the medicine after examination.

Easing of pain or swelling after antibiotics does not mean the source of infection has gone. Cleveland Clinic stresses that a dental abscess will not go away by itself; further treatment depends on the type of abscess and the condition of the tooth and may involve root canal treatment, periodontal treatment or extraction. The article on antibiotics in dentistry explains further.

What can you do at home before seeing a dentist?

Home measures ease abscess pain until your appointment but do not treat it, so contact a dentist straight away. The NHS recommends over-the-counter painkillers strictly as directed in the leaflet, soft food, a soft toothbrush and avoiding very hot or very cold food and drinks.

Warm or cold compresses on the cheek do not replace drainage. The MSD Manual lists warm, moist compresses only as aftercare following an incision, after the procedure and on a clinician’s advice; the NHS does not include them in home measures before an appointment.

• Take an over-the-counter painkiller as directed in the leaflet and do not exceed the dose: the NHS warns that a higher dose does not work better and may be dangerous.
• If you are pregnant, take regular medicines or the abscess affects a child, ask a pharmacist or doctor which medicine to use.
• Eat soft meals and chew on the other side to avoid loading the painful tooth.
• Brush with a soft toothbrush, including gently around the painful area.
• Do not see a GP for an abscess: the NHS explains that GP surgeries do not treat teeth, so seek an urgent dental appointment.

Where can you get help at night or at weekends in Białystok?

At night or at weekends, you can use emergency dental care funded by the NFZ, Poland’s National Health Fund. It is free for eligible patients and needs no referral. In Podlaskie, the NFZ “Gdzie się leczyć” service lists one location: ul. Częstochowskiej 18/II in Białystok, open Monday to Friday from 19:00 to 7:00 and around the clock on Saturdays and Sundays, phone 85 651 51 70 (as of 24 October 2026).

When infection spreads to the face and neck, hospital care takes over. The Department of Maxillofacial and Plastic Surgery at the University Clinical Hospital in Białystok lists treatment of dental abscesses and cellulitis among its services (as of 24 October 2026), but symptoms threatening breathing require an emergency department or 112 first.

A separate article on dental care at night and at weekends lists emergency department addresses and explains the out-of-hours service. It is worth phoning before attending emergency dental care, as public holiday hours may differ.

How abscess treatment works at DentalBlue

At DentalBlue in Białystok, patients with an abscess can attend a “Wizytę z bólem” (visit in pain), including a panoramic X-ray, consultation, examination and pain relief; the listed price is 340 zł. “Nacięcie i drenaż ropnia” (abscess incision and drainage) costs 200 zł and “Płukanie ropnia” (abscess irrigation) 100 zł. The dentist determines the final treatment and cost after examination; prices may change. If inflammation is too acute for local anaesthesia to work, a joint dental and anaesthesiology consultation decides on treatment under general anaesthesia. The clinic opens Monday to Friday from 8:00 to 20:00 and Saturdays from 8:00 to 16:00; reception: 85 748 00 50.