What is a tooth infection?
- Common causes
- Deep decay, a cracked tooth or gum disease
- Lasting fix
- Dental treatment: root canal, drainage or extraction
- Antibiotics
- Help a spreading infection, but don't cure the tooth
- Go to the ER if
- Swelling spreads to your eye or neck, or affects breathing
A tooth infection starts when bacteria get inside a tooth or the gum around it, usually through deep decay, a crack or advanced gum disease. As the body fights the bacteria, a pocket of pus called an abscess can form at the tip of the root or in the gum.
An abscess doesn't heal on its own. Even if it drains and the pain eases, the source of the infection is still there. Lasting treatment means a dentist removing that source with a root canal, by draining the abscess, or by taking out the tooth.
Antibiotics have a supporting role: they help when infection starts spreading beyond the tooth, but they can't repair the tooth itself.
Signs of a tooth infection
Symptoms usually center on one tooth but can spread across the face:
- Severe, throbbing toothache that may spread to your jaw, ear or neck
- Pain when you bite down or chew
- Sensitivity to hot or cold that lingers
- A swollen, red gum or a pimple-like bump near the tooth
- A bad taste or smell, or a sudden rush of salty fluid if the abscess drains
- Tender, swollen glands under your jaw
Signs the infection is spreading
Go to an emergency room right away if a toothache comes with:
- Facial swelling spreading toward your eye or down your neck
- Trouble swallowing, breathing or opening your mouth
- Fever, or feeling very unwell
NotePain that suddenly fades doesn't always mean the infection is gone. Sometimes the nerve inside the tooth has died while the infection continues, so it still needs a dentist.
Why tooth infections happen
- Untreated cavities
- Decay that reaches the soft pulp inside the tooth lets bacteria in.
- Cracks and chips
- Even a fine crack can give bacteria a path to the nerve.
- Gum disease
- Deep pockets between the gum and tooth can trap bacteria and become infected.
- Old or failing dental work
- Leaky fillings or crowns can allow decay to start underneath.
- Dry mouth
- Saliva helps protect teeth. Some medications and conditions reduce it.
- Diabetes or a weakened immune system
- These make infections harder to fight and more likely to spread.
How a tooth infection is diagnosed
A dentist confirms a tooth infection by examining the tooth, tapping on it, testing its response to cold and taking X-rays to see the root and surrounding bone.
In an online visit, your provider assesses your symptoms, where the pain and swelling are, how long it has lasted and whether there are signs of the infection spreading. That's enough to decide on pain relief, whether antibiotics are appropriate and how urgently you need to be seen.
Treating a tooth infection
Treating the tooth itself is what clears the infection for good. Dental guidelines advise against antibiotics for a toothache alone, because they don't relieve pain from an inflamed nerve and they add side effects and resistance.
Antibiotics are recommended when an abscess is causing signs that the infection is spreading, such as swelling, fever or feeling unwell, and they are given alongside, not instead of, dental treatment.
| Antibiotics, when needed | Your provider chooses based on your allergies and health history |
|---|
Guidelines suggest stopping antibiotics about a day after swelling and fever have fully resolved. Your provider will tell you exactly how long to take yours.
Managing pain until you see a dentist
- Over-the-counter pain relievers such as ibuprofen or acetaminophen, at label doses, if they're safe for you
- Rinse gently with warm salt water
- Chew on the other side and avoid very hot, cold or sugary foods
- Don't put aspirin directly on the gum. It can burn the tissue.
- Book a dentist as soon as you can, even if antibiotics make you feel better
When an online dental visit makes sense
Online care can help if you:
- Have tooth pain or a suspected abscess and can't see a dentist right away
- Have swelling limited to the gum, with no trouble breathing or swallowing
- Want to know whether antibiotics are appropriate
- Need advice on safe pain relief in the meantime
Get in-person or emergency care if you:
- Have facial swelling spreading toward your eye or neck
- Have trouble swallowing, breathing or opening your mouth
- Have a high fever or feel very unwell
- Have severe pain after a recent extraction or dental procedure
How PulseCareMD can help with a tooth infection
A PulseCareMD visit is a practical bridge when you can't get dental care right away. Your provider can't drain an abscess or repair a tooth remotely, but can assess your symptoms, recommend pain relief and advise on next steps, including how urgently you need a dentist.
Describe your symptoms
Tell us where it hurts, how long it's lasted, whether there's swelling or fever, and about any allergies.
A provider reviews your visit
A licensed provider checks for signs that the infection is spreading. Many visits are reviewed within 2–3 hours.
Get a plan and next steps
You'll get a care plan, along with guidance on getting dental treatment.
Keeping your teeth infection-free
Most tooth infections start with problems that can be caught early:
Brush twice a day
Use a fluoride toothpaste and brush for two minutes.
Clean between teeth
Floss or use interdental brushes once a day.
Keep up with checkups
Regular dental visits catch decay before it reaches the nerve.
Cut back on sugar
Limit sugary drinks and snacks, especially between meals.
Don't ignore a cracked tooth
Get chips and cracks repaired before bacteria get in.
Protect your teeth
Wear a mouthguard for contact sports or nighttime grinding.
Frequently asked questions
When to get emergency care
Call 911 or go to the nearest emergency room if you have:
- Swelling under your tongue or in your neck
- Difficulty breathing or swallowing
- Swelling that is closing your eye
- High fever with facial swelling, or confusion