Infection After Tooth Extraction: 8 Signs & What to Do

Short answer: Infection after tooth extraction is uncommon (affecting 1% to 5% of routine extractions) but requires prompt treatment when it occurs. The key warning signs are pain that worsens after day 3 instead of improving, fever lasting more than 24 hours, pus or foul-smelling discharge, and swelling that increases rather than decreases after the third day.

Knowing how to tell the difference between normal healing discomfort and an actual infection can save you days of unnecessary worry, or help you get treatment before a minor infection becomes a serious problem.

The 8 Key Signs of Infection After Tooth Extraction

1. Pain That Gets Worse After Day 3

Normal post-extraction pain follows a predictable pattern: worst on days 1 to 2, then steadily improving. If your pain reverses course and intensifies on days 3 to 5 or later, something may be wrong.

Infection-related pain tends to feel different from typical extraction soreness. Patients describe it as throbbing, deep, and unrelenting, the kind of pain that disrupts sleep and doesn’t fully respond to over-the-counter medication.

Note: Pain that worsens on days 3 to 5 can also indicate dry socket, which is a different complication (loss of the blood clot rather than infection). Your dentist can distinguish between the two during an examination.

2. Fever Above 101°F (38.3°C)

A mild, low-grade temperature (99° to 100°F) in the first 24 hours after extraction is not uncommon, your immune system is responding to tissue trauma. However, a temperature above 101°F that persists beyond 24 hours is a strong indicator of infection.

Take your temperature twice a day for the first week if you have any concern. A rising fever pattern (each reading higher than the last) is more worrisome than a single borderline reading.

3. Pus or Discharge From the Extraction Site

Clear or slightly blood-tinged fluid seeping from the extraction site during the first day is normal. What’s not normal:

Yellow, green, or grayish discharge, this is pus, a direct sign of bacterial infection
Thick, opaque fluid that oozes when you press near the extraction site
Discharge that increases over time rather than decreasing

If you see pus, contact your dentist the same day. Post-extraction infections with active drainage generally need antibiotics and may require irrigation of the socket.

4. Persistent Bad Taste or Foul Odor

Your mouth may taste slightly metallic or off during the first day or two, this is from blood and healing tissue. But a distinctly foul, rotten, or sour taste that persists or worsens after day 2, especially one that doesn’t improve with gentle salt water rinsing, often indicates bacterial activity at the extraction site.

Similarly, a noticeable bad smell originating from the extraction area (that other people can detect when you speak) is a concerning sign.

5. Swelling That Increases After Day 3

Facial swelling after an extraction is normal and typically peaks around day 2 before gradually subsiding. The pattern matters more than the amount:

Normal: Swelling peaks on day 2, holds steady on day 3, noticeably decreases by day 4 to 5
Concerning: Swelling continues increasing after day 3, or appears to improve and then returns

For more details on evaluating post-extraction swelling, see our when to worry about swelling guide.

Infection-related swelling may also feel different, warmer to the touch, firmer, and more tender than typical post-operative swelling.

6. Swollen Lymph Nodes That Keep Growing

Mild lymph node swelling under the jaw or along the neck is a normal immune response after extraction. However, lymph nodes that are progressively enlarging, very painful, or haven’t started shrinking by day 7 may indicate the immune system is fighting an active infection rather than simply managing the normal healing process.

7. Difficulty Opening Your Mouth (Trismus) That Worsens

Some jaw stiffness after extraction is normal, especially after wisdom tooth removal. But trismus (limited mouth opening) that gets worse over time rather than gradually improving can signal infection spreading to the muscles and tissues around the extraction site.

If you could open your mouth 2 finger-widths on day 2 but can barely open it 1 finger-width on day 5, that’s a red flag. See our jaw stiffness guide for what’s normal versus concerning.

8. General Malaise or Feeling Unwell

Feeling tired on the day of extraction is expected. But if you develop a pattern of increasing fatigue, body aches, chills, or a general sense of being unwell several days after the extraction, your body may be fighting a spreading infection. These systemic symptoms, especially combined with any of the local signs above, warrant prompt evaluation.

Normal Healing vs. Infection: Side-by-Side Comparison

Understanding the difference prevents both unnecessary panic and dangerous delay:

Pain pattern:

Normal: Worst on days 1–2, gradually improving each day
Infection: Gets worse after day 3, or improves then returns

Swelling:

Normal: Peaks day 2, starts decreasing day 3–4
Infection: Continues increasing after day 3, or returns after improving

Taste/odor:

Normal: Slight metallic taste for 1–2 days
Infection: Persistent foul taste/odor that worsens over time

Discharge:

Normal: Slight blood-tinged or clear fluid, day 1
Infection: Yellow/green pus, increasing over time

Temperature:

Normal: Possible low-grade temp (under 100°F) for 24 hours
Infection: Fever above 101°F lasting more than 24 hours

Energy level:

Normal: Tired on day of procedure, improving daily
Infection: Increasing fatigue, malaise, chills after initial improvement

What Causes Post-Extraction Infections

Several factors can introduce or allow bacteria to colonize the extraction site:

Pre-existing infection. If the extracted tooth had a periapical abscess (infection at the root tip) or severe periodontal disease, the bacteria were already present. Extraction disrupts the contained infection and can allow bacteria to spread into surrounding tissues.

Contamination during the procedure. While dental offices follow strict sterilization protocols, the mouth naturally contains over 700 species of bacteria. Any surgical procedure in this environment carries some infection risk.

Poor aftercare. Not following post-extraction instructions, particularly regarding oral hygiene, food choices, and activity restrictions, increases the chance of bacterial contamination of the healing socket.

Smoking. Tobacco use impairs blood flow to the extraction site, reduces oxygen delivery to healing tissues, and introduces harmful chemicals. Smokers have significantly higher infection rates, according to research in the British Journal of Oral and Maxillofacial Surgery. See our smoking after tooth extraction guide for specific timelines.

Weakened immune system. Patients with diabetes, autoimmune conditions, or those taking immunosuppressive medications have a higher risk of post-surgical infection.

Dry socket. While dry socket is not an infection, the exposed bone and tissue are more vulnerable to secondary bacterial infection.

Risk Factors That Increase Infection Likelihood

You’re at higher risk if:

The extracted tooth was already infected
You smoke or use tobacco products
You have diabetes (particularly if blood sugar is poorly controlled)
You’re taking medications that suppress your immune system
The extraction was complex or traumatic (impacted wisdom teeth, broken roots requiring surgical removal)
You have a history of post-surgical infections
You have poor overall oral hygiene

What to Do If You Suspect an Infection

Step 1: Don’t Panic, but Don’t Wait

Post-extraction infections are treatable and rarely dangerous when caught early. However, delaying treatment allows the infection to spread to deeper tissues, making it harder and more expensive to resolve.

Step 2: Contact Your Dentist

Call your dentist’s office and describe your symptoms. Most dental offices have same-day emergency slots or an after-hours line for post-surgical concerns. Mention specifically:

Which symptoms you’re experiencing
When they started and whether they’re getting better or worse
Your temperature if you’ve been monitoring it
Any medications you’re currently taking

Step 3: Continue Basic Aftercare While You Wait

Take anti-inflammatory medication (ibuprofen) as directed for pain and inflammation
Continue gentle salt water rinses to keep the area as clean as possible
Avoid smoking, alcohol, and hard foods
Keep your head improved when resting

Step 4: Don’t Self-Treat With Leftover Antibiotics

Taking random antibiotics from a previous prescription is tempting but problematic. The wrong antibiotic, wrong dose, or incomplete course can mask symptoms without resolving the infection, encourage antibiotic-resistant bacteria, and make your dentist’s diagnosis harder.

How Your Dentist Treats Post-Extraction Infection

Treatment depends on the severity:

Mild Infection (Most Common)

Antibiotics: Typically amoxicillin (500 mg three times daily for 7 days) or clindamycin if you’re allergic to penicillin. Your dentist will choose the antibiotic based on the likely bacteria involved.
Socket irrigation: Flushing the extraction site with saline or antimicrobial solution to remove debris and bacteria.
Continued monitoring: A follow-up visit in 3 to 5 days to confirm the infection is resolving.

Moderate Infection

Stronger or combination antibiotics
Possible incision and drainage if an abscess has formed
More frequent follow-up visits
Possible referral to an oral surgeon if the infection involves deep tissue spaces

Severe Infection (Rare)

In rare cases, an untreated post-extraction infection can spread to the deep tissue spaces of the neck (Ludwig’s angina) or to the bloodstream (sepsis). These are medical emergencies. Signs include:

Difficulty breathing or swallowing
Swelling under the tongue or across the floor of the mouth
Swelling that extends to the neck or throat
High fever with confusion or disorientation

If you experience any of these symptoms, go to the emergency room immediately. Do not wait for a dental appointment.

How to Reduce Your Infection Risk

The best treatment for infection is prevention:

Follow all aftercare instructions from your dentist, they’re based on decades of clinical evidence
Keep the extraction site clean with gentle salt water rinses starting 24 hours after the procedure
Don’t smoke for at least 72 hours, ideally the full first week
Take prescribed antibiotics if your dentist gave them preventively (finish the entire course)
Eat soft, clean foods and avoid anything that could leave debris in the socket. Our soft food meal plan provides practical options.
Avoid alcohol for at least 48 to 72 hours, as it can impair healing and interact with pain medications
Rest adequately during the first 2 to 3 days, your immune system needs energy to heal the extraction site
Keep your follow-up appointment even if everything feels fine

When to Go to the Emergency Room

While most post-extraction infections are managed in the dental office, seek emergency medical care if you experience:

Difficulty breathing or swallowing
Rapidly spreading swelling in the face, neck, or throat
Fever above 103°F (39.4°C)
Inability to open your mouth
Chest pain or heart palpitations with fever
Confusion or altered consciousness

These symptoms are rare but can indicate a severe infection requiring IV antibiotics and possible surgical intervention.

Key Takeaway

Post-extraction infections are uncommon but recognizable. The pattern matters most: normal healing improves steadily from day 2 onward, while infection reverses that trend with worsening pain, increasing swelling, fever, and discharge. If you notice this reversal, contact your dentist promptly, early treatment with antibiotics resolves most post-extraction infections quickly. Don’t wait, but don’t panic.

Written and researched by the editorial team.

Sources: British Journal of Oral and Maxillofacial Surgery; American Dental Association; Journal of Oral and Maxillofacial Surgery; Mayo Clinic.