What Is Pericoronitis and How Is It Related to Wisdom Teeth

Pericoronitis is inflammation of the gum tissue surrounding a partially erupted tooth, most commonly a lower wisdom tooth. It can develop when food, plaque and bacteria become trapped beneath a flap of gum covering part of the tooth. Symptoms may include pain, swelling, a bad taste, difficulty opening the mouth and discomfort when swallowing. Prompt dental assessment is important because untreated pericoronitis can worsen or recur.

Wisdom teeth are the last adult teeth to emerge and often appear during the late teenage years or early adulthood. For some people, there is not enough room in the jaw for these teeth to erupt normally. When a wisdom tooth only partially emerges through the gum, a small flap of tissue can remain over part of the tooth. This creates an area where bacteria and food debris can become trapped, increasing the risk of a condition called pericoronitis.

What Exactly Is Pericoronitis?

Pericoronitis is inflammation of the soft gum tissue surrounding the crown of a partially erupted tooth. It is most frequently associated with lower wisdom teeth. The gum flap over the tooth, sometimes called an operculum, can create a difficult-to-clean space. Bacteria can accumulate underneath it and cause inflammation or infection. The condition can range from mild localised irritation to a more significant infection requiring prompt treatment.

Why do wisdom teeth cause pericoronitis?

Partially erupted wisdom teeth can leave a flap of gum over the tooth. Food and bacteria may become trapped beneath this tissue, leading to inflammation and sometimes infection.

What Are the Symptoms of Pericoronitis?

Symptoms vary depending on the severity of the inflammation. Early pericoronitis may cause tenderness and redness around the wisdom tooth, particularly when eating or brushing. As the condition becomes more severe, symptoms can include swelling around the back of the mouth, persistent pain, an unpleasant taste or smell, pus or discharge, and difficulty chewing. Some people may also experience difficulty opening their mouth fully or discomfort when swallowing.

Can Pericoronitis Cause Bad Breath or a Bad Taste?

Yes. Bacteria and trapped food around a partially erupted wisdom tooth can contribute to unpleasant breath or a persistent bad taste. If infection develops and fluid or pus drains from the area, the taste may become particularly noticeable. Persistent bad breath or an unusual taste combined with pain or swollen gums should be professionally assessed. You can also read more about why wisdom teeth can cause a bad taste in your mouth.

Can pericoronitis cause a bad taste in your mouth?

Yes. Bacteria, trapped food and discharge around an inflamed wisdom tooth can cause an unpleasant or persistent taste in the mouth.

Why Are Partially Erupted Wisdom Teeth Difficult to Clean?

Wisdom teeth are positioned at the very back of the mouth, making them harder to reach with a toothbrush and other cleaning aids. A partially erupted tooth creates an additional challenge because the gum tissue may cover part of the chewing surface. Food and plaque can become trapped beneath this tissue where routine brushing may not reach effectively. This can contribute not only to pericoronitis but also to tooth decay and gum problems around the wisdom tooth or the neighbouring molar.

Can Pericoronitis Go Away by Itself?

Mild symptoms may sometimes improve temporarily, particularly if the area is kept clean. However, improvement does not necessarily mean the underlying problem has been resolved. If the gum flap and partially erupted tooth remain, food and bacteria may continue to collect in the area. This means pericoronitis can return. Repeated episodes should be assessed by a dentist to determine why the condition is recurring and whether further treatment is appropriate.

Can pericoronitis come back?

Yes. Pericoronitis can recur when a partially erupted wisdom tooth continues to trap bacteria and food beneath the surrounding gum tissue.

How Is Pericoronitis Diagnosed?

A dentist will examine the wisdom tooth and surrounding gum tissue, looking for signs of inflammation, swelling and infection. Dental X-rays may also be recommended to assess the position of the wisdom tooth, how much space is available for it to erupt and its relationship with nearby teeth and structures. This information helps determine the most appropriate treatment approach.

How Is Pericoronitis Treated?

Treatment depends on the severity of the condition and the position of the wisdom tooth. The area may be professionally cleaned to remove trapped food, plaque and debris. Your dentist may also provide advice on keeping the area clean while the inflammation settles. Additional treatment may be required when infection is present or symptoms are more severe. Antibiotics are not automatically required for every case and are generally considered when clinically appropriate, particularly if there are signs of spreading infection or systemic involvement. If pericoronitis continues to return because the wisdom tooth cannot erupt normally, wisdom tooth removal may be considered.

When Might Wisdom Tooth Removal Be Recommended?

Not every partially erupted wisdom tooth needs to be removed. However, extraction may be recommended when the tooth repeatedly causes pericoronitis, cannot be cleaned effectively, damages a neighbouring tooth or develops other problems such as decay. Your dentist will consider the position of the tooth, your symptoms, X-ray findings and overall oral health before recommending removal. For more information, see our guide on how to tell if your wisdom teeth may need to be removed.

Does pericoronitis mean your wisdom tooth needs to be removed?

Not always. Treatment depends on the severity of the inflammation and the position of the wisdom tooth. Repeated episodes may make wisdom tooth removal an appropriate option.

When Should You Seek Urgent Care?

Pericoronitis should be assessed promptly if pain or swelling is worsening. More urgent assessment is particularly important if swelling spreads into the face or neck, you develop a fever, or you feel generally unwell. Difficulty swallowing, significant difficulty opening the mouth, or any difficulty breathing can indicate a more serious infection and requires urgent medical or dental attention.

Reducing the Risk of Pericoronitis

Keeping the area around partially erupted wisdom teeth as clean as possible can help reduce bacterial and food build-up. Careful brushing and following personalised cleaning advice from your dental team can be helpful. Regular dental examinations also allow wisdom teeth to be monitored before they cause significant problems. If a tooth repeatedly becomes inflamed despite good oral hygiene, your dentist can discuss longer-term treatment options.

Pericoronitis is a common problem associated with partially erupted wisdom teeth, particularly lower wisdom teeth. It develops when bacteria and food become trapped beneath gum tissue surrounding the tooth, leading to inflammation and sometimes infection. While mild symptoms may temporarily improve, recurring pain, swelling, bad taste or difficulty opening the mouth should not be ignored. A dental examination can identify the cause, assess the position of the wisdom tooth and determine whether cleaning, monitoring or wisdom tooth removal is the most appropriate approach.