Dental Abscess and Urgent Toothache
A guide to recognising infection, getting definitive care and knowing when it is an emergency.
A dental abscess is a collection of pus caused by infection in or around a tooth. It can begin after decay reaches the pulp, through a crack or trauma, or within the tissues affected by gum disease.
An abscess does not resolve permanently on its own. Pain may reduce if pressure drains or the nerve dies, but the source of infection remains and still needs dental treatment.
What matters most
1. Contact a dentist urgently. If you cannot access urgent dental care, use NHS 111.
2. Definitive treatment removes or drains the source — commonly through root canal treatment, periodontal treatment or extraction.
3. Antibiotics are not a substitute for drainage and are only needed in selected situations, such as spreading infection or systemic illness.
4. Difficulty breathing or swallowing, swelling near the eye or a large rapidly spreading mouth or neck swelling is an emergency.
How an abscess develops
When bacteria reach the pulp of a tooth, infection can pass through the root tip into surrounding tissues. A periodontal abscess starts in a gum pocket or supporting tissues. Both can produce pressure, swelling and tenderness.
The safest treatment depends on the source, whether the tooth can be restored and whether infection is localised or spreading. Repeated antibiotics without dental treatment allow the problem to return and contribute to antibiotic resistance.
What you might notice
Possible signs include:
severe, throbbing or persistent toothache
pain on biting or a tooth that feels raised
swelling of the gum, face or jaw
a bad taste, pus or a small draining spot on the gum
fever, swollen glands, difficulty opening the mouth or feeling unwell
hot or cold sensitivity, or a tooth that has become dark after trauma
Why it happens and who is at greater risk
deep tooth decay is a common route for bacteria to enter the pulp.
a crack, fracture, leaking restoration or dental trauma may expose or damage the pulp.
periodontitis can produce deep pockets where a periodontal abscess develops.
partially erupted wisdom teeth may become infected under the surrounding gum.
dry mouth and high decay risk can allow infection to develop quickly.
reduced immunity or poorly controlled diabetes can increase the risk of more serious spread.
Less pain does not always mean recovery
Pain can ease when an abscess drains, or the pulp loses vitality. If there has been swelling, discharge or severe toothache, the tooth still needs assessment even when it suddenly feels better.
What you can do now
These measures may improve comfort while you obtain urgent care; they do not cure the infection.
Contact a dentist urgently. Explain any swelling, fever, difficulty opening, medical conditions and whether symptoms are worsening.
Use NHS 111 if needed. If your dentist is closed or you cannot obtain urgent care, NHS 111 can direct you to the appropriate service.
Use pain relief safely. Follow the packet instructions and ask a pharmacist what is suitable with your conditions, pregnancy status and other medicines. Do not exceed the stated dose.
Choose soft food and fluids. Chew on the other side and avoid very hot, cold or sugary items if they trigger pain.
Keep the area gently clean. Use a soft toothbrush. A warm salt-water rinse may soothe the mouth if you can rinse and spit safely.
Do not use leftover antibiotics. The drug, dose and duration may be wrong, and antibiotics do not remove the source.
Do not place aspirin on the gum. It can burn the tissues and does not treat the infection.
Keep it practical
Do not delay because you are worried about treatment. Tell the dental team about anxiety, medicines and medical conditions so care can be planned safely.
How I can help
The immediate priorities are to locate the source, assess spread and make the tooth and surrounding tissues safe.
Assessment
history of pain, swelling, fever, medical risk and previous treatment
examination of the tooth, gums, face, jaw opening and regional tissues
pulp tests and appropriate radiographs
assessment of restorability and whether infection is localised or systemic
Treatment options
drainage through the tooth, gum or a small incision when appropriate
root canal treatment to disinfect and seal a restorable infected tooth
periodontal treatment where the source is a gum pocket
extraction when the tooth cannot or should not be retained
antibiotics only when clinically indicated, alongside — not instead of — definitive dental care
What success looks like
Finish any prescribed course exactly as directed and attend the planned dental treatment. Improvement on antibiotics alone does not mean the cause has gone.
When not to wait for a routine appointment
Call 999 or attend A&E now if you have:
- difficulty breathing, swallowing or speaking
- swelling around the eye, eye pain or a change in vision
- a lot of swelling in the mouth, floor of mouth, face or neck, especially if it is spreading quickly
- severe restriction in opening the mouth with worsening swelling or systemic illness
For urgent toothache or a smaller local swelling without these emergency features, contact a dentist or NHS 111 rather than going routinely to A&E.
Trusted information and next steps
These resources support the advice in this guide. They are useful for further reading but do not replace an examination or advice tailored to your health.
NHS: Dental abscess: Symptoms, treatment and emergency signs.
NHS: Toothache: Self-care and when to seek help.
NHS: Root canal treatment: How an infected tooth may be retained.
NHS dental abscess guidance
Scan for NHS advice on urgent dental care and emergency warning signs. Open the trusted patient resource.
The main message
A dental abscess needs definitive dental treatment. Pain relief and, where appropriate, antibiotics can support care, but the source still has to be drained, disinfected or removed.
Seek help early, and treat breathing difficulty, swallowing difficulty, eye involvement or rapidly spreading swelling as an emergency.
Clinical basis: NHS: Dental abscess, NHS: Toothache and NHS: Root canal treatment. General information only; this guide cannot diagnose your symptoms or replace an individual assessment. Reviewed by Dr Jordan Frankgate, July 2026.
