A wisdom tooth infection can range from a mild nuisance to a serious dental emergency. The most common type is pericoronitis — an infection of the gum tissue surrounding a partially erupted wisdom tooth. Here is what you need to know about recognising, treating, and preventing wisdom tooth infections.
What Is Pericoronitis?
Pericoronitis occurs when the gum flap (operculum) over a partially erupted wisdom tooth traps food particles and bacteria. This creates an environment ripe for infection. It is extremely common in patients aged 17 to 30 and is one of the most frequent reasons people seek emergency dental care in Singapore.
Symptoms of a Wisdom Tooth Infection
Watch for these signs:
- Pain and tenderness around the wisdom tooth area, often radiating to the ear, jaw, or throat
- Swollen, red gums behind the last molar
- Difficulty or pain when chewing
- Difficulty opening your mouth (trismus)
- Bad breath or foul taste in the mouth
- Pus draining from the gum around the tooth
- Swelling in the cheek, jaw, or neck
- Fever and general feeling of being unwell
- Difficulty swallowing (in severe cases)
When Is a Wisdom Tooth Infection an Emergency?
A wisdom tooth infection is an emergency if you have significant facial swelling that is spreading, difficulty swallowing or breathing, a fever above 38°C, pus discharge you cannot control, or severe pain that does not respond to painkillers. These signs suggest the infection may be spreading to deeper tissues and requires urgent dental treatment.
Seek immediate dental care if you have:
- Significant facial swelling that is spreading
- Difficulty swallowing or breathing
- Fever above 38°C
- Pus discharge
- Severe pain that is not relieved by over-the-counter painkillers
These symptoms may indicate the infection is spreading beyond the wisdom tooth area and could require urgent treatment.
What Causes Wisdom Tooth Infections?
Wisdom tooth infections are most commonly caused by partial eruption, where a gum flap over the tooth traps food and bacteria. Other causes include poor access for cleaning (wisdom teeth are at the back of the mouth), tooth decay in the wisdom tooth itself, and food impaction between the wisdom tooth and the adjacent molar.
- Partial eruption — the gum flap creates a pocket that traps food and bacteria
- Poor access for cleaning — wisdom teeth are hard to brush properly
- Tooth decay — cavities in the wisdom tooth can lead to infection
- Impaction — the tooth pressing against adjacent teeth creates pressure points where bacteria thrive
How Are Wisdom Tooth Infections Treated?
Treatment involves two stages. First, the acute infection is controlled with antibiotics, professional cleaning of the infected gum flap, and pain management. Once the infection subsides (usually within a few days), the underlying cause is addressed — in most cases, this means surgical extraction of the wisdom tooth to prevent the infection from recurring.
Step 1: Control the Acute Infection
If you come in with an active infection, the first priority is to get it under control. This typically involves:
- Antibiotics to fight the bacterial infection
- Pain relief medication
- Cleaning and irrigation of the infected area
- Drainage of any abscess if present
Step 2: Remove the Wisdom Tooth
Once the infection has settled (usually within a few days to a week), we recommend removing the wisdom tooth to prevent recurrence. Pericoronitis almost always recurs if the tooth is left in place — each episode tends to be worse than the last.
Important: We generally do not extract a wisdom tooth during an active severe infection, as this can spread the infection further. Antibiotics first, extraction once things have settled. However, in mild cases, same-day extraction may be possible.
Can You Treat a Wisdom Tooth Infection at Home?
Home remedies can temporarily manage symptoms but cannot cure a wisdom tooth infection. Warm salt water rinses (3 to 4 times daily), over-the-counter painkillers like ibuprofen or paracetamol, and keeping the area clean can help while you wait for a dental appointment. However, you should see a dentist as soon as possible — antibiotics are usually needed to clear the infection.
While you should see a dentist as soon as possible, these measures can help manage symptoms temporarily:
- Warm salt water rinses — rinse gently 3 to 4 times a day
- Over-the-counter painkillers (ibuprofen or paracetamol) as directed
- Soft diet to avoid aggravating the area
- Good oral hygiene — brush carefully around the area
These are temporary measures. Home remedies will not cure the infection — you need professional treatment and likely extraction to prevent recurrence.
How to Prevent Wisdom Tooth Infections
- Remove problematic wisdom teeth early before infections start
- Keep the area clean — use a small-headed toothbrush to reach behind the last molar
- Rinse after meals to dislodge trapped food
- Regular dental check-ups — your dentist can monitor wisdom teeth and recommend removal before problems develop
