You have a toothache, and now you also feel hot, achy, and worn out. You wonder if the two are connected, and whether you should be worried.
They can be. This article explains why a tooth infection can make your whole body feel unwell, how to tell a mild problem from a dangerous one, and what to do if antibiotics aren't helping.
Can a Tooth Infection Make You Sick?
Yes, a tooth infection can make you sick. When bacteria spread beyond the tooth, your immune system releases chemicals that cause fever, chills, tiredness, and body aches. A fever is not random. It can mean your body is responding to the infection.
Whole-body signs include:
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Fever or chills
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Feeling very tired or run down
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Nausea or loss of appetite
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Headache
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Swollen glands in the neck
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A fast heartbeat or fast breathing
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Dizziness or feeling faint
You can feel quite sick with only mild tooth pain, especially if the infection has drained or spread. Pain is a poor measure of how serious this is. You also do not need a swollen face to have a serious oral infection.
For tooth-specific symptoms, see our guide to tooth abscess symptoms.
How Sick Is Too Sick? The 4-Stage Severity Ladder
Tooth infections can range from local problems to life-threatening emergencies. The following four levels can help you recognize warning signs, although infections do not always progress in this order.
| Stage | What it feels like | What to do |
|---|---|---|
| 1. Local | Tooth pain, gum bump, bad taste | See a dentist within 1 to 2 days |
| 2. Spreading | Swollen cheek, jaw, or face | Call a dentist the same day |
| 3. Whole-body | Fever, chills, fast heartbeat | Seek urgent medical assessment the same day; ER if severely unwell |
| 4. Critical | Trouble breathing or swallowing, confusion, swelling under the tongue | Go to the ER or call 911 |
Severe infections can lead to cellulitis, a spreading infection of the skin and soft tissue, or sepsis, a life-threatening response to infection.
Signs of possible sepsis include fever, chills, a racing heart, fast breathing, confusion, or feeling faint. These symptoms require urgent medical attention.
Swelling under the tongue can signal a deep infection called Ludwig's angina, which can block the airway. A dental infection can also spread to other parts of the body.
Dangerous spread deep in the floor of the mouth or neck can feel like tightness or pressure rather than sharp pain. Do not wait for severe pain before you take it seriously.
Not sure where you fall on the ladder? Call a dental office and describe your symptoms. For severe symptoms, seek emergency care immediately.
How Long Until a Tooth Infection Kills You?
People often search for this in fear, so here is the answer. There is no fixed timeline. Some infections remain localized for an extended period, while others can become serious quickly if they spread into the deep spaces of the face or neck or cause a severe body-wide infection.
The danger is not simply how long you have waited. It is how far the infection has spread and how your body is responding.
Some people face a higher risk of serious complications:
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People with diabetes
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People with a weakened immune system
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People receiving chemotherapy or taking long-term steroids
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Older adults and young children
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People who are pregnant
If you are in one of these groups, treat any fever or facial swelling as urgent and seek prompt professional assessment.
When Should You Go to the ER for a Tooth Infection?
Go straight to the ER or call 911 if you have any of these symptoms:
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Trouble breathing or swallowing
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Swelling under the tongue or spreading toward the eye or neck
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Drooling or being unable to open your mouth normally
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A stiff neck with a severe headache
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Confusion or extreme sleepiness
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Fever with a racing heart, especially if you feel faint or severely unwell
At triage, explain your symptoms clearly: "I have a tooth infection, swelling, and a fever."
This information can help medical staff assess the urgency of your condition.
If you have swelling or a fever without these red flags, contact a dentist for urgent same-day assessment. Do not delay care until the following week.
What If You Are Still Sick on Antibiotics?
Antibiotics alone often cannot eliminate the source of a tooth infection. They can help control certain bacterial infections, but an infected tooth or abscess may still require dental treatment.
That is why some people feel better temporarily but experience symptoms again when the underlying problem remains untreated.
Call your dentist or doctor the same day if, while taking antibiotics, you notice:
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Swelling that is growing
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A fever that returns or persists
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Pain or symptoms that are getting worse
If swallowing becomes difficult, seek emergency care immediately.
Do not stop or change your medicine on your own. Follow your prescriber's instructions and contact them if your symptoms persist or you experience side effects.
The treatment is called source control. Depending on the condition, it may involve draining an abscess, treating the tooth with a root canal, or removing the tooth.
Dentists can assess which treatment is appropriate. Sedation options may also be available for patients who feel anxious about dental procedures.
ER or Dentist: Which One Do You Need?
Go to the ER for medical emergencies, and see a dentist to treat the cause of the tooth infection.
| ER | Dentist | |
|---|---|---|
| Best for | Breathing trouble, serious spreading infection, severe illness | Diagnosing and treating the source of a dental infection |
| Can do | Emergency assessment, IV antibiotics when needed, airway management, and sometimes drainage | Dental drainage, root canal treatment, or extraction |
| Usually cannot do | Provide definitive treatment for the infected tooth | Manage a life-threatening medical emergency |
If you have red-flag symptoms, go to the ER first, then arrange dental follow-up.
Without red flags, a dentist is usually the appropriate first point of contact.
Cost is a real reason people delay care. Ask about payment plans and a written treatment estimate. Dental school clinics and community health centers may also offer lower-cost options.
FAQ's
How long can you leave a tooth infection?
Do not delay treatment for a suspected tooth infection. If you have swelling or a fever, seek same-day care. With tooth pain alone and no warning signs, arrange a dental appointment within one to two days.
Can a tooth infection spread to the brain?
Rarely, a dental infection can spread and cause serious complications involving the brain. If you have a severe headache, stiff neck, confusion, or other concerning symptoms, seek emergency medical care.
Can a tooth infection cause sepsis?
Yes. A severe dental infection can sometimes lead to sepsis, a life-threatening response to infection. Fever with a racing heart, fast breathing, confusion, or feeling faint may indicate a medical emergency.
My tooth pain stopped. Am I fine?
Not necessarily. Pain can stop when the tooth nerve loses its function or an abscess drains, but the infection may remain. A dental examination is still needed to identify and treat the cause.
Final Thoughts
If you have a suspected tooth infection, pay attention to changes in your symptoms. Recording your temperature and noting when swelling began or whether it is spreading can help your dental or medical team assess your condition.
Do not delay urgent care to track symptoms if you have difficulty breathing, trouble swallowing, confusion, or rapidly increasing swelling.