That dull ache in your tooth has turned into a relentless, throbbing pain, and now your jaw feels tender and your cheek looks puffy. You might be wondering if it will settle on its own, or if you actually need to see someone. A tooth that hurts like this is your body sounding an alarm, and it is worth listening to.
Tooth infection symptoms most often point to a dental abscess, a pocket of pus from a bacterial infection. The most common signs are a severe, persistent, throbbing toothache, sensitivity to hot and cold, swelling in the face or gum, and sometimes fever. A tooth abscess does not heal by itself, so knowing what to look for, and what counts as an emergency, can protect both your tooth and your health.
What is a tooth infection?
A tooth infection is what happens when bacteria reach the inner part of a tooth or the surrounding gum and create a pocket of pus called an abscess. There are two main types. A periapical abscess forms at the very tip of the tooth root, usually from an untreated cavity, an injury, or prior dental work that let bacteria reach the pulp inside the tooth. A periodontal abscess forms in the gum, beside the root.
This is far from a rare problem. Nearly 90% of U.S. adults ages 20 to 64 have had dental caries (tooth decay) in their permanent teeth, and decay is the most common precursor to an abscess. The good news is that catching the warning signs early gives a dentist the best chance to save the tooth.
What are the symptoms of a tooth infection?
The classic sign is a severe, persistent, throbbing toothache that can radiate outward into the jawbone, neck, or ear. Many people also notice sensitivity and swelling. Watch for these common tooth infection symptoms:
- A severe, persistent, throbbing toothache that may spread to the jaw, neck, or ear
- Sensitivity to hot and cold temperatures
- Pain or sensitivity when biting down or chewing
- Fever
- Swelling in your face or cheek
- Tender, swollen lymph nodes in your neck or under your jaw
- A sudden rush of foul-smelling, salty-tasting fluid in your mouth, often with a quick easing of pain, if the abscess ruptures
How do dentists recognize an abscess?
On a dental exam, a periapical abscess often pushes the affected tooth slightly upward in its socket, so it can feel higher than the teeth around it and hurt when tapped. The tooth itself may look discolored or have visible breaks in the enamel, with redness and swelling in the gum nearby.
To confirm the diagnosis, a dentist typically combines a hands-on exam with a dental X-ray, which shows the pocket of infection at the root that you cannot see from the outside. This is also how they decide on the right treatment for your specific tooth.
Why a tooth abscess will not go away on its own
It is tempting to hope the pain will simply fade, and sometimes it does drop suddenly, especially if the abscess ruptures and drains. But relief does not mean the infection is gone. Even after a rupture, the bacteria remain and the infection persists.
A tooth abscess requires actual dental treatment. Depending on the situation, that usually means draining the abscess, performing a root canal to clear the infection inside the tooth, or extracting the tooth, often along with antibiotics. Importantly, antibiotics alone are generally an adjunct, not a cure; they support drainage rather than replace it. The longer an infection sits, the more it can spread.
When is a tooth infection an emergency?
Most tooth infections are handled by a dentist, but some signs mean you should seek emergency care right away. Go to the ER if you have a fever along with facial swelling and cannot reach a dentist, or if you have difficulty breathing or swallowing. These signal that the infection may be spreading into the jaw, throat, or neck. Altered mental status and shortness of breath are also urgent danger signs.
Untreated spread can lead to Ludwig's angina, a rapidly progressing infection of the spaces in the neck that can threaten the airway. Its mortality was over 50% before antibiotics and is now about 8% with prompt treatment. A spreading tooth infection can also lead to sepsis, a life-threatening, body-wide response to infection. These complications are uncommon, but they are exactly why a worsening tooth infection is never something to wait out.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting any new skincare treatment, especially if you have underlying health conditions, are pregnant, or are taking medications.
