Infected Wisdom Tooth: Symptoms and When to See a Dentist

What does a wisdom tooth infection feel like?

Wisdom tooth infections typically produce a characteristic cluster of symptoms:

• Throbbing pain at the back of the jaw, often on one side
• Swollen, red, or tender gum tissue around the wisdom tooth
• Difficulty opening the mouth fully (trismus) in more severe cases
• Bad taste in the mouth or foul breath caused by bacterial discharge from under the gum flap
• Swollen lymph nodes under the jaw or in the neck
• Difficulty swallowing in more advanced infections
• Fever — a sign that the infection may be spreading beyond the local area

What is pericoronitis?

Pericoronitis is inflammation and infection of the tissue (operculum) that partially covers an erupting wisdom tooth. When a wisdom tooth only partially emerges, a flap of gum tissue sits over part of the tooth's biting surface. Food particles and bacteria accumulate under this flap and are difficult to clean, making infection common.

Pericoronitis can be: - Mild (localized): soreness, slight swelling, and bad taste — managed with irrigation and improved cleaning - Moderate: significant swelling, restricted mouth opening, fever - Severe: spreading infection toward the jaw, throat, or neck — this is a medical emergency

Current evidence-based guidance recommends local therapy (irrigation, debridement) as the first-line approach for mild pericoronitis; systemic antibiotics should be reserved for cases with fever, systemic involvement, or spreading infection 2Ref 2Schmidt J, Kunderova M, Pilbauerova N, Kapitan M (2021).A Review of Evidence-Based Recommendations for Pericoronitis Management and a Systematic Review of Antibiotic Prescribing for Pericoronitis among Dentists: Inappropriate Pericoronitis Treatment Is a Critical Factor of Antibiotic Overuse in Dentistry.Local irrigation and debridement are the evidence-based first-line treatment for mild pericoronitis; systemic antibiotics are widely over-prescribed and should be reserved for spreading or systemically significant infection. The lower wisdom teeth are affected much more commonly than the upper ones because they are more often partially impacted.

How is it different from normal wisdom tooth pain?

Some discomfort is normal as wisdom teeth erupt — a feeling of pressure, mild tenderness, or brief soreness as the tooth pushes through the gum. Normal eruption discomfort is typically low-grade and comes and goes.

Infection-related pain is different: - It is more severe and persistent - The gum tissue looks visibly swollen and red, not just mildly sensitive - There is often a bad taste or smell - Symptoms worsen over days rather than improving - Swallowing may become uncomfortable - Fever may develop

If you are uncertain, a dentist can examine the area, take an X-ray to assess the tooth's position, and determine whether infection is present.

What are the treatment options?

For pericoronitis (gum infection over a partial eruption) The dentist will irrigate under the gum flap to remove food and bacteria. Antibiotics may be prescribed if there is fever, spreading infection, or significant swelling — but a systematic review found that antibiotics are widely over-prescribed for pericoronitis and that local treatment is usually sufficient for mild cases 2Ref 2Schmidt J, Kunderova M, Pilbauerova N, Kapitan M (2021).A Review of Evidence-Based Recommendations for Pericoronitis Management and a Systematic Review of Antibiotic Prescribing for Pericoronitis among Dentists: Inappropriate Pericoronitis Treatment Is a Critical Factor of Antibiotic Overuse in Dentistry.Local irrigation and debridement are the evidence-based first-line treatment for mild pericoronitis; systemic antibiotics are widely over-prescribed and should be reserved for spreading or systemically significant infection. Pain relievers (ibuprofen or acetaminophen) help manage discomfort.

Extraction When an impacted wisdom tooth is causing recurrent infections, is decayed, or is damaging adjacent teeth, extraction is usually the definitive solution. A Cochrane review found that the decision to remove versus retain an asymptomatic impacted tooth involves weighing the risk of future problems against surgical risk 1Ref 1Ghaeminia H, Nienhuijs MEL, Toedtling V, Perry J, Tummers M, Hoppenreijs TJM, Van der Sanden WJM, Mettes TG (2020).Surgical removal versus retention for the management of asymptomatic disease-free impacted wisdom teeth.Evidence base for the decision between removing and retaining impacted wisdom teeth; recurrent pericoronitis is a recognized indication for extraction. Recurrent pericoronitis is a recognized indication for extraction.

For a dental abscess If infection has spread to form a dental abscess (a pocket of pus in the bone or soft tissue), the dentist will drain the abscess and may prescribe antibiotics. More extensive infections may require hospital management.

When should I go to the emergency room versus calling a dentist?

Most wisdom tooth infections can be managed by a dentist on an urgent-care basis. However, some infections spread rapidly to the airway and are life-threatening — a true dental emergency. Go to an emergency room immediately if you have:

• Swelling that is extending to the face, neck, or floor of the mouth
• Difficulty breathing or swallowing
• High fever (above 101°F / 38.3°C) that is increasing
• Inability to open the mouth at all

For routine signs of infection (localized swelling, pain, bad taste, no fever, no difficulty breathing), call a dentist promptly — same day if possible.