A tooth infection can start small, a bit of sensitivity, a dull ache, and then build quickly into something you can't ignore. Knowing the signs early gives you and your dentist more options, and helps you avoid the situation becoming more serious.
Here's what a tooth infection actually is, the symptoms to watch for, and when it's time to get seen.
What Is a Tooth Infection?
A tooth infection, sometimes called a dental abscess, happens when bacteria get inside a tooth or around its root. Your body responds by forming a pocket of pus, which is what causes the swelling and pain associated with an infection.
Tooth infections don't resolve on their own. Left alone, the infection can spread beyond the tooth into the surrounding gum, jaw, and in rare cases, further through the body.
H2: Common Tooth Infection Symptoms
Symptoms can vary depending on where the infection is and how far it's progressed. Common signs include:
- A sharp or throbbing toothache, especially when biting or chewing
- Sensitivity to hot or cold that lingers longer than usual
- Swelling in the gums, cheek, or face
- Redness or warmth around the affected area
- Bad breath or an unpleasant taste in your mouth
- A pimple-like bump on the gum, sometimes leaking fluid
- A tooth that feels loose or "pushed out"
- Fever or generally feeling unwell
- Swollen glands in the neck
Some people experience intense pain, while others notice very few symptoms at all. Either way, an infection is worth having checked, since pain levels don't always reflect how serious it is.
What Causes a Tooth Infection?
A tooth infection usually develops when bacteria find a way into the softer inner part of the tooth, called the pulp. Common causes include:
- Untreated tooth decay
- A cracked, chipped, or broken tooth
- Gum disease that has progressed and affected the tissue around the tooth root
- A previous filling or root canal that hasn't fully sealed
- Impacted or partially erupted wisdom teeth, which can trap bacteria beneath the gum
If you've noticed bleeding gums, gaps forming between teeth, or other signs that might point to gum disease, it's worth getting that looked at too, since gum issues can be a pathway for infection.
Risks of Leaving a Tooth Infection Untreated
A tooth infection that isn't treated can spread beyond the tooth into nearby tissue. In some cases, this can lead to:
- Swelling that spreads into the jaw, face, or neck
- Difficulty opening your mouth fully
- Infection reaching the jawbone
- In rare but serious cases, infection spreading toward the airway or into the wider body (sepsis)
These more advanced complications are uncommon, but they're part of why dentists take tooth infections seriously rather than treating them as something to wait out.
Warning Signs That Need Urgent Care
Most tooth infections can be managed with a standard dental appointment. However, some symptoms need urgent attention. Contact a dentist or go to a hospital emergency department straight away if you notice:
- Rapidly spreading facial swelling
- Difficulty swallowing or breathing
- A high fever, chills, or a racing heart
- Severe headache, neck stiffness, or confusion
These symptoms suggest the infection may be affecting more than just the tooth, and they need prompt medical attention rather than a routine booking.
For anything that feels urgent but isn't an emergency-department situation, Green Door Dental's emergency dental service can help assess how quickly you need to be seen.
How Tooth Infections Are Treated
Treatment depends on the cause and how far the infection has progressed. Options a dentist may consider include:
- Draining the infection, to relieve pressure and pain
- Root canal treatment, to clean out infected tissue while keeping the natural tooth
- Tooth extraction, if the tooth is too damaged to be saved
- Antibiotics, in some cases, alongside treatment to address the underlying cause (antibiotics alone don't resolve an infection)
- Gum treatment, if the infection is linked to gum disease
Your dentist will talk you through which option suits your situation, since the right approach depends on the tooth, the extent of the infection, and your overall health.
