Pain or swelling behind your last molar can make you wonder if your wisdom tooth is infected. Common infected wisdom tooth symptoms include worsening pain, red or swollen gum tissue, a bad taste, bad breath, pus, and trouble opening your mouth. These signs do not confirm an infection by themselves, but they are a good reason to contact a dentist.
A partially erupted wisdom tooth often leaves a small gum flap where food and bacteria collect. Infection can also begin inside a decayed tooth or in the tissues around it. Mild pressure from a tooth coming in may feel similar at first, so the pattern and combination of symptoms matter more than pain alone.
Most wisdom tooth infections can be treated, especially when checked early. Some symptoms call for a prompt dental visit, while rapidly increasing swelling or problems breathing or swallowing need emergency care. Knowing what your symptoms may mean and what a dentist will look for can help you choose the right next step.
What Is an Infected Wisdom Tooth?
An infected wisdom tooth may involve the gum around the tooth, the soft tissue inside it, or the bone near its roots. The location matters because each type of infection may need a different treatment.
Wisdom teeth usually erupt during the late teens or early 20s. A lower wisdom tooth that only partly comes through the gum can leave a flap of tissue around the tooth. Food and bacteria may become trapped beneath this flap, making infection more likely.
Pericoronitis Around a Partially Erupted Tooth
Pericoronitis is inflammation or infection around the crown of a partially erupted tooth. It often develops when plaque and food collect beneath a gum flap called an operculum. The tissue may become red, swollen, painful, and difficult to clean.
Decay, Gum Infection, and a Wisdom Tooth Abscess
An infection can also start when tooth decay or a crack allows bacteria to reach the dental pulp inside the affected tooth. It may then spread through the root and form an abscess, which is a pocket of pus. Gum disease can cause a separate infection beside the tooth.
These problems can produce similar symptoms. A dentist may need to examine the area and take an X-ray to find out whether the infection begins in the gum, tooth, root, or nearby tissue.
9 Infected Wisdom Tooth Symptoms to Watch For
Infected wisdom tooth symptoms vary from person to person. One symptom does not confirm an infection, but several symptoms occurring together or symptoms that keep getting worse make professional assessment more important.
- Persistent or Worsening Pain: Infection may cause a steady ache or throbbing pain at the back of the mouth. The pain may become stronger, interrupt sleep, or return soon after pain medicine wears off.
- Red, Swollen, or Tender Gums: The tissue around the wisdom tooth may look puffy, feel sore, or bleed during gentle cleaning. A swollen gum flap over a partly erupted tooth is a common sign of pericoronitis.
- Jaw or Cheek Swelling: Swelling may begin near the affected tooth and become visible along the jaw or cheek. Increasing or spreading swelling needs prompt attention.
- Pus or Drainage Near the Tooth: White or yellow drainage from beneath the gum is a strong sign of infection. Pus may appear when the area is touched, but you should not squeeze or press it.
- A Lasting Bad Taste or Bad Breath: Fluid draining from an infected area can create a bitter, salty, or unpleasant taste. Trapped food and bacteria around the wisdom tooth may also cause bad breath that does not improve after brushing.
- Pain When Biting, Chewing, or Swallowing: Inflamed tissue can hurt when food touches it or when the opposing tooth bites against a swollen gum flap. Painful swallowing may develop when inflammation affects nearby tissue.
- Jaw Stiffness or Difficulty Opening the Mouth: Infection and inflammation near the jaw muscles may limit how widely you can open your mouth. Dentists call this trismus. Increasing restriction may indicate that the infection is spreading.
- Tender Lymph Nodes: The lymph nodes beneath the jaw or in the neck may become swollen and sore as the body responds to infection.
- Fever or Feeling Generally Unwell: Fever, chills, tiredness, or malaise can indicate that the problem is no longer limited to the tissue around the tooth. These symptoms warrant prompt professional care.
What Does an Infected Wisdom Tooth Feel Like?
“Infected wisdom tooth symptoms may include a dull ache, sharp tenderness, or deep throbbing pain behind the last molar. The area may hurt when you chew, swallow, brush, or touch the gum. Some people notice pressure in the back of the mouth before the pain becomes constant.
Severe pain can occur, but pain intensity alone cannot confirm an infection. An impacted tooth, deep cavity, cracked tooth, or inflamed jaw joint may also hurt badly. A dentist must consider the full pattern of symptoms and examine the area.
Can the Pain Spread to Your Ear, Jaw, or Throat?
Wisdom tooth pain can seem to spread along the jaw or toward the ear because nearby areas share nerve pathways. Swelling and inflammation may also make the throat feel sore or make chewing and swallowing uncomfortable.
However, an earache, headache, or sore throat does not automatically indicate a wisdom tooth infection. Ear disease, sinus problems, jaw-joint disorders, and other dental conditions can cause similar pain.
Infected Wisdom Tooth Symptoms vs. Normal Eruption Pain
Normal eruption can cause mild pressure or tenderness as a wisdom tooth moves through the gum. Infection is more likely when pain worsens, several symptoms occur together, or there is drainage, fever, or spreading swelling.
| Feature | Normal Eruption Discomfort | Possible Wisdom Tooth Infection |
|---|---|---|
| Pain pattern | Mild pressure or temporary soreness | Persistent, throbbing, or worsening pain |
| Gum appearance | Mild localized tenderness | Red, swollen, bleeding, or draining tissue |
| Bad taste or pus | Not expected | May be present |
| Jaw or facial swelling | Not expected | May occur and can increase |
| Mouth opening | Usually normal | May become limited or painful |
| Fever or malaise | Not expected | May indicate systemic involvement |
| Progression | Often settles as irritation improves | May worsen, return, or spread without treatment |
You cannot always tell the difference at home. Mild wisdom tooth discomfort can also come from food trapped under the gum or pressure from impaction. Pus, facial swelling, fever, or increasing difficulty opening your mouth should not be treated as ordinary eruption pain.
Could These Symptoms Have Another Cause?
Several conditions can resemble symptoms of an infected wisdom tooth. A dental examination is important because the place where you feel pain is not always its true source.
- An Impacted Wisdom Tooth: Impaction can cause pressure, gum irritation, or damage to neighboring teeth without an active infection.
- Food Trapped Beneath the Gum: Food packed around a partially erupted tooth can cause soreness, a bad taste, and temporary inflammation.
- Tooth Decay: A cavity in the wisdom tooth or nearby second molar can cause sensitivity, pain during chewing, or an aching toothache.
- Gum Disease: Inflamed or infected gum pockets may bleed, swell, and produce a bad taste.
- Another Dental Abscess: Pain may come from the second molar or another nearby tooth rather than the wisdom tooth.
- Jaw-Joint or Muscle Pain: Jaw clenching, grinding, and temporomandibular joint problems can cause pain near the ear and back teeth.
- Ear or Sinus Problems: Ear infections and sinus inflammation can sometimes feel like tooth or jaw pain.
How to Tell If the Infection May Be Spreading
A localized infection usually causes pain, redness, and swelling close to the affected tooth. When infection spreads into nearby facial or neck tissues, symptoms may become more extensive or affect how you feel overall.
Watch for these changes:
- Increasing Facial or Neck Swelling: Swelling that moves beyond the immediate gum area needs urgent assessment.
- Worsening Jaw Stiffness: A growing inability to open your mouth may indicate deeper inflammation.
- Fever or Chills: These symptoms suggest a wider response to the infection.
- Feeling Weak or Unwell: Malaise can occur when the body is responding to a more significant infection.
- Difficulty Swallowing: Increasing pain or difficulty when swallowing can indicate involvement of deeper tissues.
- Rapid Symptom Progression: Pain or swelling that becomes noticeably worse over hours deserves urgent attention.
The Health Service Executive’s guidance on pericoronitis identifies cellulitis, lymph-node involvement, trismus, fever, and malaise as findings that may accompany spreading or systemic infection.
When to See a Dentist or Seek Emergency Care
Most suspected wisdom tooth infections need dental care, but not every case requires a hospital visit. The right level of care depends on swelling, systemic symptoms, mouth opening, swallowing, breathing, and how quickly the condition is changing.
Contact a Dentist Promptly
Contact a dentist for an assessment if you have:
- Persistent or Worsening Pain: Pain that does not settle or keeps returning may require treatment.
- Swollen or Draining Gum Tissue: Redness, pus, bleeding, or tenderness around the tooth can indicate local infection.
- A Persistent Bad Taste: Ongoing unpleasant drainage may come from beneath the gum or an abscess.
- Fever or Malaise: These symptoms can indicate that the infection is affecting more than the immediate area.
- Difficulty Chewing or Opening Your Mouth: Increasing discomfort or jaw stiffness requires timely assessment.
- Repeated Episodes: Recurring pain and swelling often mean the underlying source remains.
Contact a dentist sooner if you have reduced immunity, poorly controlled diabetes, or another significant medical condition. Tell the dental office about your symptoms and health history so the team can judge how quickly you need to be seen.
Get Emergency Medical Help
Seek emergency medical help if you have:
- Trouble breathing, speaking, or swallowing
- A large or rapidly increasing swelling inside the mouth
- Swelling spreading into the face, neck, or area around the eye
- New vision problems
- Confusion, faintness, or severe systemic illness
These symptoms can signal a threat to the airway or spread into deeper tissues. The NHS emergency guidance for a dental abscess advises emergency care for breathing, speaking, or swallowing difficulty, significant mouth swelling, eye involvement, and severe restriction in mouth opening.
Why Wisdom Teeth Become Infected
Wisdom teeth sit at the far back of the mouth, where cleaning can be difficult. Limited space, partial eruption, impaction, decay, and gum disease can all raise the infection risk.
Difficulty cleaning this area does not always mean poor oral hygiene. Even someone who brushes their teeth carefully may struggle to reach beneath a deep gum flap or between a tilted wisdom tooth and the second molar.
Partial Eruption and a Gum Flap
When part of a wisdom tooth breaks through the gum, a flap of tissue may remain over its crown. Food, plaque, and bacteria can collect in the space beneath it. The flap may also become sore if the upper tooth repeatedly bites against it.
This warm, hard-to-clean space can lead to pericoronitis. Symptoms may improve after the trapped material is removed, but infection can return if the same pocket remains.
Impaction and Limited Cleaning Access
Wisdom teeth become impacted when they do not have enough room to erupt normally. They may tilt toward a neighboring tooth, angle backward, remain partly under the gum, or stay within the jawbone.
Impaction itself is not an infection. However, a partly exposed impacted tooth can create areas that trap plaque and food. A tilted tooth may also make the space beside the second molar difficult to clean.
Tooth Decay, Cracks, and Gum Disease
Tooth decay can progress through enamel and dentin until bacteria reach the pulp. Infection may then travel through the root canals and into the surrounding bone, where an abscess can form.
Deep gum pockets can also allow bacteria to affect the supporting tissues around the wisdom tooth or nearby teeth. Cracks provide another possible route for bacteria to enter the tooth.
Can an Infected Wisdom Tooth Heal on Its Own?
A mild flare of gum inflammation may settle after food is removed and the area is cleaned, but temporary improvement does not prove that the underlying problem has gone. A cavity, abscess, deep gum pocket, or difficult-to-clean flap may continue to harbor bacteria.
Do not rely on repeated home treatment when pain or swelling returns. Proper diagnosis and treatment can address the source rather than only reducing the symptoms.
What If the Infection Drains or the Abscess Bursts?
If an abscess drains, the pressure and pain may suddenly decrease. You may notice a foul or salty taste in your mouth. This does not mean the infection has healed; bacteria and damaged tissue may remain, so contact a dentist even if you begin to feel better.
How a Dentist Diagnoses a Wisdom Tooth Infection
To identify the cause of infected wisdom tooth symptoms, a dentist considers your health history, performs an examination, and uses imaging when needed. The steps may include:
- Reviewing Your Symptoms: The dentist asks when the pain started, whether it is worsening, and whether you have swelling, drainage, fever, or difficulty swallowing.
- Checking Your Health History: Medical conditions, pregnancy, allergies, medicines, and immune status can influence the urgency and appropriate treatment.
- Examining the Gum and Tooth: The dentist looks for a gum flap, trapped debris, decay, pus, bleeding, tenderness, and swelling around the wisdom tooth.
- Assessing Mouth Opening and Swelling: Limited opening, facial swelling, tender lymph nodes, and deeper tissue involvement help show how far the inflammation may extend.
- Testing Nearby Teeth: The second molar or another tooth may be causing the pain. The dentist may check for decay, tenderness, gum pockets, and pulp health.
- Taking an X-Ray When Needed: An X-ray can show the tooth’s position, nearby roots and bone, decay, and some signs of infection or damage.
Dental imaging should be chosen according to the patient’s history and examination rather than taken automatically. This follows the ADA’s recommendations on using dental X-rays only when clinically necessary.
How Dentists Treat an Infected Wisdom Tooth
Because infected wisdom tooth symptoms can have different causes, treatment depends on where the infection started and whether it is localized or spreading. The dentist first works to control pain and infection, then addresses the source to reduce the chance of another episode.
Cleaning, Irrigation, or Drainage
For pericoronitis, a dentist may gently flush and clean beneath the gum flap to remove trapped food, plaque, and debris. Local treatment is often the first step when the infection remains limited to that area.
If an abscess has formed, the dentist may need to create a path for drainage. The tooth may also need root canal treatment or extraction, depending on its condition, position, and usefulness.
When Antibiotics May Be Needed
Antibiotics are not required for every infected wisdom tooth. Local dental treatment is often more important when infection remains limited, and the source can be treated directly. The ADA guideline on antibiotics for dental pain and swelling recommends prioritizing dental treatment for many localized pulpal and periapical conditions and using antibiotics when systemic involvement, such as fever or malaise, develops.
Pericoronitis follows a similar principle. Antibiotics may be appropriate when there is spreading swelling, systemic illness, significant trismus, or added medical risk. Only take an antibiotic prescribed for your current condition; leftover medicine may be inappropriate, unsafe, or unable to control the bacteria causing the infection.
When Wisdom Tooth Removal May Be Recommended
Wisdom tooth extraction may be recommended when the tooth is badly decayed, cannot be restored or cleaned, damages nearby teeth, or causes repeated pericoronitis. An abscess, gum disease, cyst, or other disease around the tooth may also justify tooth removal.
Removal does not always need to occur during the first mild episode. Timing depends on infection severity, access, swelling, medical health, and surgical difficulty. The NICE recommendations for wisdom tooth extraction state that a first episode of pericoronitis is not usually an indication for surgery unless it is particularly severe, while repeated episodes can support removal.
If extraction is appropriate, a dentist or oral surgeon may remove the tooth while symptoms are active or plan surgery after the acute problem has been controlled. The safest approach depends on the examination and X-ray findings.
Can an Infected Wisdom Tooth Be Saved?
Some wisdom teeth can be kept if they are fully erupted, functional, accessible for cleaning, and restorable. A cavity may sometimes be filled, and a localized gum problem may respond to cleaning and improved access.
Keeping the tooth becomes less predictable when it is poorly positioned, repeatedly infected, deeply decayed, difficult to restore, or harming the second molar. The decision should consider both the affected tooth and the long-term health of neighboring teeth.
What to Do While Waiting for a Dental Appointment
Home care may temporarily ease infected wisdom tooth symptoms, but it cannot confirm the diagnosis or remove a deep source of infection. While waiting for professional care:
- Clean the Area Gently: Use a soft toothbrush to remove plaque and loose food without forcing the bristles beneath painful tissue.
- Rinse With Warm Salt Water: A gentle rinse may help clear debris and soothe irritated gum tissue. Spit it out rather than swallowing it.
- Choose Soft Foods: Yogurt, eggs, soup, soft pasta, and mashed vegetables may be easier to eat. Avoid sharp, hard, or sticky foods that can lodge beneath the gum.
- Chew on the Other Side: This may reduce pressure on the affected tooth and swollen tissue.
- Stay Hydrated: Drink water regularly, especially if eating has become uncomfortable.
- Avoid Smoking and Vaping: Smoke, heat, and chemicals can irritate oral tissue and make healing more difficult.
- Monitor Changes: Pay attention to increasing swelling, fever, mouth-opening difficulty, swallowing problems, or a decline in how you feel.
Using Over-the-Counter Pain Medicine Safely
Nonsteroidal anti-inflammatory drugs, such as ibuprofen or naproxen, alone or combined with acetaminophen, are first-line options for many adults with acute dental pain, according to the ADA acute dental pain management guideline. However, these medicines are not safe for everyone.
Follow the package directions and avoid taking two products containing the same ingredient. Ask a dentist, physician, or pharmacist before use if you are pregnant, have kidney or liver disease, stomach ulcers, bleeding problems, medication allergies, or take blood thinners or other medicines. Pain relief does not treat the source of infection.
What Not to Put on an Infected Wisdom Tooth
Avoid actions that can burn tissue, push infection deeper, or delay appropriate treatment:
- Do Not Place Aspirin on the Gum: Aspirin can cause a chemical burn when held against oral tissue.
- Do Not Cut or Puncture the Area: Trying to drain an abscess or lift a gum flap may spread bacteria, cause bleeding, or damage nearby structures.
- Do Not Squeeze Out Pus: Pressure may injure the tissue and does not remove the source.
- Do Not Use Leftover Antibiotics: The drug, dose, and duration may be wrong, and partial treatment can make later diagnosis more difficult.
- Do Not Apply Harsh Chemicals: Alcohol, bleach, peroxide concentrates, and undiluted essential oils can burn the gum.
- Do Not Pack Material Beneath the Gum: Cotton, crushed tablets, powders, and other substances may become trapped and worsen irritation.
What to Expect After Treatment
The expected recovery depends on whether treatment involved cleaning, drainage, restoration, root canal treatment, or wisdom teeth removal. Local tenderness and jaw stiffness may take time to settle. Your dentist should explain how to clean the area, use any prescribed medicine, and arrange follow-up care.
After an extraction, some pain, swelling, bruising, and jaw soreness are expected. Contact the treating dentist or surgeon if symptoms do not follow the expected course, become worse after starting to improve, or are joined by fever, pus, a foul taste, or increasing swelling.
How to Reduce the Risk of Another Infection
You cannot prevent every wisdom tooth problem, but keeping the area clean and monitoring difficult-to-reach teeth can lower the risk.
- Brush Behind the Second Molar: Angle a small, soft toothbrush toward the back of your mouth to clean the last visible tooth and gumline.
- Clean Around a Partly Erupted Tooth: Follow your dentist’s instructions for removing debris without injuring the gum flap.
- Use Interdental Cleaning When Possible: Floss or another recommended device can help clean the space between the second and third molars.
- Treat Decay Early: A cavity in the wisdom tooth or neighboring tooth may become harder to restore as it grows.
- Attend Dental Examinations: A dentist can monitor tooth position, gum health, cleaning access, and damage that may not yet cause pain.
- Follow a Long-Term Plan: Some wisdom teeth can be monitored. Others may need removal when infection or damage makes retention less suitable.
Common Questions About Infected Wisdom Teeth
Can a Wisdom Tooth Be Infected Without a Fever?
Yes. Many localized wisdom tooth infections do not cause a fever, especially in their early stages. Pain, swollen gum tissue, pus, jaw stiffness, or a persistent bad taste may still indicate a problem. Fever is more concerning for systemic involvement, but its absence does not rule out infection.
Can an Infected Wisdom Tooth Damage the Tooth Next to It?
Yes. A tilted or partially erupted wisdom tooth can trap plaque and food against the second molar. This may contribute to tooth decay, gum-pocket formation, bone loss, or root damage in the neighboring tooth. Early examination may allow the dentist to protect the second molar before damage becomes difficult to treat.
Can an Upper Wisdom Tooth Become Infected?
Yes. Upper and lower wisdom teeth can develop cavities, pulp infection, gum disease, or an abscess. Pericoronitis occurs more often around partly erupted lower wisdom teeth, but an upper tooth can still trap food, irritate nearby tissue, or become infected if bacteria enter the tooth or surrounding gum.
Can a Fully Impacted Wisdom Tooth Become Infected?
A wisdom tooth completely enclosed by healthy gum and bone is not exposed to oral bacteria in the same way as a partially erupted tooth, so it does not usually develop pericoronitis. However, disease can still develop around it, or infection can spread from an adjacent tooth. An X-ray and examination are needed to identify the cause.
Is a Wisdom Tooth Infection Contagious?
No. A wisdom tooth infection does not spread between people like a cold or flu. Oral bacteria can pass through saliva, but another person would still need the right local conditions, such as decay, a deep gum pocket, or a partially erupted tooth, for an infection to develop.
Can an Infection Develop After Wisdom Tooth Removal?
Yes, although normal postoperative pain and swelling do not necessarily mean infection. After the wisdom tooth is removed, contact your dentist or oral surgeon if pain or swelling becomes worse after initially improving, or if you develop pus, fever, a persistent foul taste, or feel unwell. These symptoms need professional assessment.
The Bottom Line
Infected wisdom tooth symptoms may include worsening pain, swollen or red gum tissue, facial swelling, pus, a bad taste, jaw stiffness, tender lymph nodes, and fever. These signs can overlap with impaction, eruption discomfort, decay, and other dental problems, so a dentist must confirm the cause.
Arrange prompt dental care for persistent pain, drainage, localized swelling, fever, or limited mouth opening. Seek emergency medical help for breathing difficulty, serious trouble swallowing, rapidly spreading facial or neck swelling, or severe systemic illness.
