What is Pericoronitis?

What is Pericoronitis? Symptoms & Treatments

Pericoronitis is a painful infection of the gum around a partially erupted wisdom tooth. When a small gum flap traps food and bacteria, the area can swell and become tender, causing bad taste, trouble chewing, and limited mouth opening. Dentists treat it with cleaning, medication, and—when it keeps returning—gum flap removal or wisdom tooth extraction.

What pericoronitis is

Pericoronitis is inflammation and infection of the gum tissue surrounding a wisdom tooth that has only partially erupted. The partially covered area (often called an operculum) can form a pocket where plaque, food debris, and bacteria collect. That trapped buildup irritates the gum and can trigger an infection that spreads into nearby soft tissue if not treated.

Common causes and risk factors

Most cases occur around lower wisdom teeth because they frequently erupt at an angle or remain partly impacted. The risk is higher when the area is hard to clean, when opposing teeth bite into the gum flap, or when general oral hygiene is disrupted. Stress, illness, and smoking can also make it easier for an infection to take hold.

• Partially erupted or impacted wisdom teeth (especially lower third molars)
• Food trapping under the gum flap and poor access for brushing/flossing
• Irritation from the upper wisdom tooth biting on the gum tissue
• Crowding around the back molars and plaque buildup
• Smoking or reduced immune resilience during illness

Symptoms of pericoronitis

Symptoms can range from mild soreness to significant pain and facial swelling. They often worsen when chewing and may flare up repeatedly over weeks or months.

• Throbbing pain at the back of the jaw (often on one side)
• Red, swollen, or tender gum tissue around the wisdom tooth
• Bad breath or a bad taste (sometimes with pus or discharge)
• Difficulty chewing or pain when biting down
• Limited mouth opening (jaw stiffness)
• Swollen lymph nodes under the jaw or in the neck

When to see a dentist urgently

Pericoronitis can become serious if the infection spreads. Seek urgent dental or emergency care if you notice any of the following warning signs.

• Fever, chills, or feeling generally unwell
• Rapidly increasing facial swelling
• Trouble swallowing, breathing, or opening the mouth
• Swelling extending into the neck or under the tongue
• Severe pain that does not improve with over-the-counter medication

How pericoronitis is diagnosed

A dentist usually diagnoses pericoronitis with an oral exam and a discussion of your symptoms. They check for swelling, trapped debris, and tenderness around the tooth. Dental X-rays are often used to see the tooth’s position and whether there is an impaction or surrounding bone involvement.

Treatment options

In-office cleaning and drainage

For many people, the first step is gently cleaning the pocket around the tooth and flushing it with an antiseptic solution. If there is pus, the dentist may help it drain, which can quickly reduce pressure and pain.

Medication

Pain relief is typically managed with anti-inflammatory medication when appropriate. Antibiotics may be prescribed when there are signs of spreading infection, fever, or significant swelling. Medication works best alongside professional cleaning because bacteria can remain trapped under the gum flap.

Gum flap removal (operculectomy)

If the tooth is expected to erupt into a healthy position, removing the gum flap can eliminate the pocket where bacteria collect. This can reduce the chance of recurrence, though it may not be suitable if the tooth is poorly positioned.

Wisdom tooth extraction

If pericoronitis keeps returning, or if the wisdom tooth is impacted or difficult to clean long term, extraction is often the most definitive solution. Your dentist or oral surgeon will confirm the best option based on your X-rays, symptoms, and overall oral health.

Home care for short-term relief

Home measures can reduce discomfort while you arrange dental care, but they do not remove the underlying cause. Avoid applying aspirin directly to the gum, and do not rely on home remedies if symptoms are worsening.

• Rinse gently with warm salt water a few times per day
• Brush carefully around the area and use an interdental brush if you can do so comfortably
• Use cold compresses on the cheek for swelling
• Choose softer foods and avoid chewing on the painful side
• Use over-the-counter pain relief only as directed and only if it is safe for you

How long pericoronitis takes to heal

With appropriate treatment, pain and swelling often start to improve within a few days. Mild cases may settle in 3–5 days once the area is cleaned and irritation is reduced. More significant infections may take 7–10 days, and recovery after a minor procedure or extraction can take up to around two weeks.

How to prevent recurrence

Pericoronitis is more likely to come back when the wisdom tooth remains partly covered by gum tissue. Good daily cleaning helps, but it may not be enough if the tooth is impacted or the gum flap is repeatedly irritated.

• Keep the back molar area clean with gentle brushing and flossing or an interdental brush
• Attend regular dental check-ups, especially during wisdom tooth eruption years
• Address recurring food trapping early—don’t wait for severe pain
• Discuss long-term options (operculectomy or extraction) if you have repeated flare-ups

Frequently asked questions

Can pericoronitis go away on its own?

Symptoms can temporarily ease if trapped debris is removed and irritation decreases. Even when pain settles, the pocket under the gum flap can remain, so flare-ups are common without dental assessment and long-term management.

Can it be treated without removing the tooth?

Sometimes, yes. Cleaning, medication, and gum flap removal may be enough when the tooth is erupting into a good position. If the tooth is impacted or infections keep returning, extraction is often the most reliable way to prevent repeat episodes.

Is pericoronitis contagious?

The infection itself is not considered contagious in the way a cold or flu is. However, the bacteria that cause gum infections are common in the mouth, so prevention focuses on reducing bacterial buildup and improving access for cleaning.