Wisdom Tooth Infection: Is It Pericoronitis?
A sore, swollen gum around a wisdom tooth can be more than normal teething discomfort. It may be pericoronitis, which is inflammation or infection around a partly erupted wisdom tooth where food and bacteria can become trapped under the gum.
The key idea
Antibiotics are not always the whole answer for wisdom tooth infection. The real issue may be a partly erupted tooth, a gum flap, trapped bacteria, difficult cleaning or recurrent inflammation that needs proper dental assessment.
Quick answer
Pericoronitis is inflammation or infection around a partly erupted tooth, most commonly a wisdom tooth. It can cause swollen gum, pain behind the last molar, bad taste, bad breath, pus, difficulty opening, painful swallowing, swollen glands or facial swelling. Mild irritation may settle with local cleaning and care, but worsening pain, swelling or systemic symptoms should be assessed promptly.
On this page
This guide explains why wisdom tooth infections happen, what symptoms to watch for, and when wisdom tooth removal may be discussed.
What is pericoronitis?
Pericoronitis usually happens around a wisdom tooth that has only partly come through the gum. A flap of gum tissue may sit over part of the tooth, creating a space where food, plaque and bacteria can collect.
A gum flap traps debris
When a wisdom tooth is partly erupted, the gum flap can be difficult to clean. Food and bacteria may become trapped underneath.
The gum becomes inflamed
The area may become swollen, tender, red, sore to bite on or painful when brushing near the back of the mouth.
Infection may develop
If bacteria build up and the area cannot drain or clean properly, symptoms may worsen and require dental care.
Common wisdom tooth infection symptoms
Symptoms can range from mild irritation to a more serious spreading infection. The pattern matters.
Local gum symptoms
- Swollen gum behind the last molar
- Redness or tenderness around a wisdom tooth
- Pain when biting on the gum flap
- Food trapping near the wisdom tooth
- Bleeding or soreness when brushing the area
Infection-type symptoms
- Bad taste in the mouth
- Bad breath that does not settle
- Pus or drainage near the gum
- Pain spreading to the jaw or ear
- Swollen glands under the jaw or neck
More concerning symptoms
- Difficulty opening the mouth
- Painful swallowing
- Facial swelling
- Fever or feeling unwell
- Swelling spreading towards the throat or neck
Mild irritation vs urgent symptoms
This table is a guide only. It cannot diagnose your situation without a dental examination.
| Feature | May be mild or early irritation | Needs prompt dental advice | Needs urgent care |
|---|---|---|---|
| Pain | Mild soreness behind the last molar. | Increasing pain, pain on biting or pain spreading to jaw or ear. | Severe pain with swelling, fever or trouble opening. |
| Gum appearance | Slight redness or tenderness near a partly erupted tooth. | Swollen gum flap, pus, bad taste or food trapping. | Facial swelling, spreading redness or neck swelling. |
| Mouth opening | Normal opening. | Stiffness or soreness when opening wide. | Difficulty opening the mouth, swallowing or breathing. |
| General health | You otherwise feel well. | You feel run down or symptoms keep returning. | Fever, chills, feeling very unwell or spreading swelling. |
| Next step | Improve cleaning and monitor closely. | Arrange dental assessment. | Seek urgent dental or medical help. |
Do antibiotics fix wisdom tooth infection?
Sometimes antibiotics may be appropriate, especially when infection is spreading or there are systemic symptoms. But antibiotics alone may not solve the underlying wisdom tooth problem.
Why antibiotics may not be enough
If the gum flap continues trapping food and bacteria, or the wisdom tooth is impacted and hard to clean, symptoms may return after medication. The source of the problem may still be present.
When antibiotics may be considered
A dentist may consider antibiotics when there are signs of spreading infection, fever, significant swelling, difficulty opening, swollen lymph nodes or other systemic signs. The decision depends on your clinical situation.
What may happen at the dentist?
The aim is to relieve symptoms, assess whether infection is local or spreading, and decide whether the wisdom tooth can be monitored or should be removed.
Examination
Your dentist checks the gum flap, swelling, pus, bite trauma, mouth opening and whether symptoms suggest spread.
X-ray assessment
An X-ray may be needed to check the wisdom tooth position, roots, nearby tooth and surrounding bone.
Local cleaning
The area may be flushed or cleaned to remove trapped food and debris under the gum flap.
Removal discussion
If symptoms keep returning or the tooth cannot be cleaned properly, wisdom tooth removal may be discussed.
When wisdom tooth removal may be discussed
- Repeated episodes of pericoronitis
- Impacted wisdom tooth position
- Food trapping that cannot be managed
- Decay in the wisdom tooth or nearby molar
- Damage or pressure against the tooth in front
- Swelling, infection or pain that keeps returning
What you can do before your appointment
- Keep the area as clean as you can without traumatising the gum.
- Use pain relief only as directed and only if suitable for you.
- Avoid poking under the gum flap with sharp objects.
- Call promptly if swelling, fever or difficulty opening develops.
- Bring a list of medicines and allergies to your appointment.
Scientific and patient references
This page links to scientific and patient-friendly references for people who want to understand pericoronitis in more detail.
Evidence-based management: A 2021 review discussed evidence-based recommendations for pericoronitis management and highlighted inappropriate antibiotic prescribing as a factor in antibiotic overuse in dentistry. Read: A review of evidence-based recommendations for pericoronitis management.
Clinical overview: StatPearls describes pericoronitis as an inflammatory process caused by infection of gum tissue surrounding or overlying an erupting or partially erupted tooth. Read: StatPearls: Pericoronitis.
Patient-friendly symptoms: Cleveland Clinic explains that pericoronitis may cause severe pain around back teeth, red and swollen gum tissue, pus, difficulty swallowing, lockjaw, facial swelling and swollen lymph nodes. Read: Cleveland Clinic: Pericoronitis.
Gum flap explanation: Columbia University College of Dental Medicine explains how a partly erupted wisdom tooth may leave a flap of gum tissue that traps food and debris, creating a breeding ground for bacteria. Read: Columbia Dental Medicine: Pericoronitis.
These links are provided for education only and do not replace personalised dental care. Worsening swelling, fever, difficulty swallowing or difficulty breathing should be assessed urgently.
Related EasyCare guides and services
These pages help connect wisdom tooth infection symptoms with the correct treatment pathway.
Common questions
Simple answers to common questions about wisdom tooth infection and pericoronitis.
What is pericoronitis?
Pericoronitis is inflammation or infection around the gum tissue of an erupting or partly erupted tooth. It most commonly affects wisdom teeth when a gum flap traps food, plaque and bacteria.
What does a wisdom tooth infection feel like?
A wisdom tooth infection may cause swollen gum behind the last molar, pain, bad taste, bad breath, pus, difficulty opening, jaw pain, swollen glands or facial swelling.
Do antibiotics fix pericoronitis?
Antibiotics may be needed when infection is spreading or systemic symptoms are present, but they do not remove the gum flap, trapped food or impacted wisdom tooth problem. Dental assessment is important.
When should I call a dentist for wisdom tooth pain?
Call a dentist if wisdom tooth pain is worsening, the gum is swollen, there is bad taste or pus, you cannot open properly, pain spreads to the jaw or ear, or symptoms keep returning.
When is wisdom tooth infection urgent?
Seek urgent advice if there is facial swelling, fever, difficulty opening, painful swallowing, swelling spreading towards the throat or neck, trouble breathing, or you feel very unwell.
Will I need my wisdom tooth removed?
Not always. Some early or mild cases may be managed with cleaning and monitoring, but removal may be discussed if infection recurs, the tooth is impacted, cleaning is difficult or nearby teeth are being affected.
Worried about swelling around a wisdom tooth?
If your gum is swollen, painful, has a bad taste or keeps flaring up around a wisdom tooth, a dental assessment can help confirm whether it is pericoronitis and what options may be suitable.
