Difficulty breathing or swallowing, drooling, swelling under the tongue or into the neck, or severe illness are medical emergencies — call 000 or go to your nearest hospital emergency department now.
A tooth abscess can start with a seemingly manageable toothache, but the infection can become more serious if it is left untreated.
A tooth abscess is a localised collection of pus caused by a bacterial infection in the tooth, around its root, or in the supporting gum and bone tissues. It can cause significant pain, swelling and sensitivity, and usually needs prompt dental care because the underlying source of infection does not normally resolve on its own.
The problem may develop because of tooth decay, a crack or injury, gum disease, previous dental work or infection around a partially erupted tooth. Symptoms can range from local tenderness to facial swelling, fever or difficulty swallowing, making it important to recognise when an abscess requires urgent dental care or emergency medical attention.
Key takeaways
- A tooth abscess does not go away on its own — the source of infection needs dental treatment
- Increasing facial swelling, fever or severe difficulty opening the mouth make the situation more urgent
- Difficulty breathing or swallowing, drooling, or swelling under the tongue or into the neck are medical emergencies
- Treatment may involve drainage, root canal treatment, extraction or periodontal treatment — antibiotics alone don't cure an abscess
What Is a Tooth Abscess?
A dental abscess develops when bacteria infect tissue in or around a tooth and a pocket of pus forms. The exact location of the infection helps determine the type of abscess and the treatment that may be needed.
Pain can sometimes decrease if pressure is released or the nerve inside the tooth loses vitality. A reduction in pain does not necessarily mean the infection has cleared.
Types of Tooth Abscess
| Type | Where it forms | How it typically develops |
|---|---|---|
| Periapical abscess | Around the tip of the tooth root | Deep decay, a crack, or trauma lets bacteria reach the dental pulp; infection spreads through the root canal and exits near the root tip |
| Periodontal abscess | In the tissues supporting the tooth | Bacteria become trapped in a deep gum pocket, often linked to gum disease, sometimes after food or another object blocks drainage |
A periapical abscess starts inside the tooth; a periodontal abscess starts in the surrounding gum tissue. Treatment needs to address both the abscess and any underlying cause, such as periodontal disease.
What Are the Symptoms of a Tooth Abscess?
Common tooth abscess symptoms include throbbing tooth pain, tenderness when biting, sensitivity to hot or cold, swelling around the gum and an unpleasant taste in the mouth. Symptoms can develop gradually or become more intense over a relatively short period, and can also extend beyond the affected tooth — fever, facial or jaw swelling, swollen glands and increasing difficulty opening the mouth can indicate that the infection is becoming more significant.
- Persistent or throbbing tooth pain
- Pain when chewing or biting
- Sensitivity to hot or cold foods and drinks
- Redness or swelling in the gum around the tooth
- A raised or pimple-like area that may contain pus
- Bad breath or an unpleasant taste in the mouth
- A loose or tender tooth
- Swelling in the cheek, jaw or face
- Fever or feeling generally unwell
Pain is not always a reliable measure of severity. An affected tooth may become less painful if the abscess begins to drain or the dental pulp loses vitality, even though the infection remains.
What Causes a Tooth Abscess?
A tooth abscess develops when bacteria reach tissue that would normally be protected. Tooth decay, cracks, dental trauma, gum disease and problems around partially erupted teeth are among the common causes. Once bacteria gain access to deeper tissues, the body's immune response can lead to swelling, inflammation and pus formation.
Tooth Decay and Cavities
A cavity creates a hole in the tooth as decay progresses through the enamel and dentine. If dental caries reaches the pulp, bacteria can enter the root canal system and cause a periapical abscess. Treating tooth decay before it reaches the pulp can reduce the risk of a deeper tooth infection.
Cracks, Injuries and Previous Dental Work
A crack in a tooth or dental injury can expose or damage the pulp even when there is no large cavity. Deep restorations or problems affecting previous dental work can also allow bacteria to reach vulnerable tissue in some cases. A dental professional may use an examination, sensitivity testing and imaging to determine whether the pulp or surrounding tissues are affected.
Gum Disease
Advanced gum disease can create deeper periodontal pockets where plaque and bacteria collect around a tooth. If drainage from a pocket becomes blocked, a localised infection and abscess may form. Treatment therefore needs to address both the infection and the underlying periodontal condition. See how we treat gum disease.
Partially Erupted or Impacted Wisdom Teeth
Partially erupted or impacted wisdom teeth can also become infected. Bacteria and food may collect beneath the flap of gum around a partially erupted tooth, increasing the risk of inflammation and infection. Assessment can help determine whether cleaning, treatment of the surrounding tissues or removal of the tooth may be appropriate.
When Is a Tooth Abscess an Emergency?
A tooth abscess needs prompt assessment, but some symptoms make the situation more urgent. Increasing facial swelling, fever, severe difficulty opening the mouth, or rapidly worsening symptoms may indicate that the infection is spreading beyond the immediate tooth and gum area. The Queensland Government advises seeking treatment immediately from a dental practitioner or GP for facial swelling associated with a dental abscess. Signs involving the airway, floor of the mouth, neck or general health require urgent medical assessment because deeper infections can become serious.
When Should an Emergency Dentist Be Contacted?
For a localised toothache or gum abscess without airway symptoms or significant facial swelling, urgent dental care is usually the appropriate first step. An emergency dentist can assess the source of the infection and determine whether drainage, root canal treatment, periodontal care or extraction is required. Prompt dental assessment is also important when pain is severe, swelling is increasing, fever develops or symptoms are worsening rather than improving.
When Is Emergency Medical Care Needed?
Emergency medical care is more appropriate when symptoms suggest that infection may be spreading into deeper tissues or affecting the airway. Warning signs include:
- Difficulty breathing or swallowing
- Drooling or difficulty managing saliva
- Swelling beneath the tongue or in the floor of the mouth
- Swelling under the jaw, around the eye or extending into the neck
- A change in voice
- Severe difficulty opening the mouth
- Rapidly worsening facial swelling
- Inability to drink or signs of dehydration
- Confusion, marked drowsiness or rapid deterioration
- Severe illness or signs of systemic infection
These symptoms should not be managed by waiting for a routine dental appointment.
Suspected Abscess?
Get it assessed promptly
Same-day urgent appointments may be available, subject to availability. Call our team to discuss your symptoms.
How Is a Tooth Abscess Diagnosed?
A dentist usually begins by reviewing symptoms and examining the tooth, gum, face and surrounding tissues. The tooth may also be checked for tenderness to pressure, sensitivity and changes in the supporting gum tissues. X-rays are commonly used to look for changes around the tooth root and surrounding bone, although an early abscess may not always be clearly visible on an X-ray.
Depending on the symptoms and severity, assessment may also involve pulp vitality or sensitivity testing, tapping or bite testing, periodontal probing, examination of the face, jaw and neck, further imaging if deeper spread is suspected, and additional medical tests when systemic infection is a concern.
More extensive imaging or hospital assessment may be required if the infection appears to have spread beyond the immediate dental area.
What Are the Main Tooth Abscess Treatment Options?
Tooth abscess treatment focuses on controlling the source of infection, relieving pressure and preserving the tooth where possible. The appropriate treatment depends on whether the infection began inside the tooth, in the periodontal tissues or around another dental structure. Antibiotics can play an important role in selected cases, but they do not replace treatment of the source.
Drainage
A dentist may drain an abscess when infected fluid has collected in an area that can be safely accessed. Releasing pus can reduce pressure and discomfort, but drainage alone may not remove the underlying source, so further dental treatment is often required.
Root Canal Treatment
Root canal treatment may be used when the infection originates in the dental pulp and the tooth can be restored. The infected pulp is removed, the canals are cleaned and disinfected, and the tooth is sealed. A further restoration or crown may be recommended depending on the condition of the tooth. See our root canal treatment page for more detail.
Tooth Extraction
Extraction may be required when an abscessed tooth is too damaged to restore predictably. Removing the tooth also removes the dental source of the infection. The decision depends on factors such as the amount of remaining tooth structure, root condition and health of the surrounding tissues.
Periodontal Treatment
A periodontal abscess may require drainage and cleaning of the affected gum pocket. Further periodontal care may also be needed to manage gum disease and reduce the risk of the infection returning. Treatment varies according to the depth of the pocket, condition of the tooth and extent of the disease.
Antibiotics
Antibiotics are generally reserved for spreading infection, systemic symptoms such as fever or malaise, situations where immediate definitive dental treatment is not possible, or specific clinical circumstances, consistent with Australian antimicrobial stewardship guidance for dental practice. They do not replace drainage, root canal treatment, periodontal treatment or extraction. Decisions about antibiotics depend on the dental examination as well as factors such as medical history, immune status, allergies, pregnancy and current prescribing guidance.
What Can Help With Dental Abscess Pain Before an Appointment?
Dental abscess pain relief at home is temporary and should not delay professional assessment. A cold compress placed against the outside of the cheek may help reduce discomfort and swelling. A pharmacist, dentist or doctor can advise on suitable pain relief based on the person's health, medicines and allergies — pain medication should be taken as directed rather than placed directly onto the tooth or gum.
Soft foods may be easier to eat while the area is painful, and very hot or cold foods may also be worth avoiding if the affected tooth is sensitive. The abscess should not be squeezed, punctured, or deliberately drained at home.
Can a Tooth Abscess Go Away on Its Own?
No. A tooth abscess does not normally go away on its own because the source of the infection remains. Symptoms may temporarily improve if the abscess releases fluid or the nerve inside the tooth loses vitality — this can make the tooth feel better without resolving the infection.
An untreated abscess can spread into nearby tissues and, in rare cases, lead to serious complications. Dental assessment is therefore recommended even when pain begins to settle. For general background on tooth abscesses, Healthdirect is a useful independent reference.
How Can the Risk of a Dental Abscess Be Reduced?
Not every dental abscess can be prevented, but reducing tooth decay, gum disease and dental trauma can lower the risk. Regular dental care can also help identify problems before they reach deeper tissues.
- Brushing twice a day with fluoride toothpaste
- Cleaning between the teeth each day
- Limiting frequent sugary foods and drinks
- Attending dental check-ups based on individual needs
- Arranging assessment for a cracked, chipped or painful tooth
- Wearing a mouthguard for contact sport
- Following recommended care for gum disease
- Seeking advice if a wisdom tooth becomes repeatedly swollen or painful
Getting a Suspected Tooth Abscess Assessed Promptly
A suspected tooth abscess is worth assessing early. Pain relief alone can't confirm the infection has resolved.
At Campsie Dental Spa, we assess urgent concerns like tooth pain, swelling and suspected infection, and explain the next step after an examination. Same-day urgent appointments may be available, subject to availability — call ahead to confirm.
Treat these as medical emergencies instead — go to hospital or call 000:
- Difficulty breathing or swallowing
- Drooling, or swelling beneath the tongue or into the neck
- Severe difficulty opening the mouth
- Rapidly worsening swelling or severe illness
This guide is general information, not a substitute for professional assessment. If in doubt, or if breathing or swallowing is affected, seek emergency medical care immediately.
Common Questions
Frequently Asked Questions
Written by
Dr James (Jim) Sternhell
Principal Dentist, Campsie Dental Spa
Dr James Sternhell has been practising dentistry for over 20 years, with a particular focus on restorative and cosmetic treatments. He is passionate about helping patients understand their options so they can make confident, informed decisions about their dental care.