Everything you need to know about wisdom teeth infection after removal

wisdom teeth infection after removal
Wisdom teeth are the last teeth to appear in the mouth. Without enough space, they are known to cause various problems.

Removing wisdom teeth is sometimes the best way to prevent the worst from happening. Depending on the complexity of the procedure, there can be various complications, including infection.

Fortunately, these are rare and the risk of the procedure is much lower than leaving the tooth in place.

In this article, you will learn about the different complications of wisdom tooth extraction and how to recognize and prevent them.

How are wisdom teeth removed?

First, your dentist will perform a clinical examination to determine your general health and current treatments to identify any potential interference with the procedure.

He will also assess the eruption and position of your wisdom teeth with an x-ray to assess the risks and take the necessary steps.

Wisdom teeth can be extracted using one of two techniques:

  • Simple extraction: If your wisdom tooth has fully erupted, your dentist will remove it directly with special instruments.
  • Surgical extraction: If the wisdom teeth are in the bone, the dentist will cut the gum to expose the tooth. He will then remove the bone to make the tooth looser and easy to remove. The tooth may be removed entirely or after cutting it into several pieces. Once the tooth is out, the gum is closed with several stitches to promote healing and protect the surgical site. This technique is the most traumatic to the tissues and, therefore, the most associated with post-operative complications.

Infections that can occur after wisdom teeth removal

All surgery carries risks, including wisdom teeth extraction. Post-operative complications vary from person to person, depending on the complexity of the procedure, your health, and the aftercare you receive.

However, it is important to distinguish between complications and postoperative effects. The latter is a normal physiological reaction that our body triggers to initiate healing.

Infections can occur days or weeks after surgery and are often associated with throbbing pain and pus discharge with signs of inflammation, including redness, swelling, and heat sensation.

Fortunately, these are rare and often temporary. Recovery usually occurs spontaneously or with known treatments. Infections that can occur after a tooth extraction include:

1. Osteitis or bone inflammation

Dry socket

Alveolar osteitis, also known as dry socket is one of the most common post-operative complications. Although alveolar osteitis is not considered an "infection", it interferes with the healing process and delays recovery. The lower wisdom teeth are most affected.

In normal conditions, when a wisdom tooth is removed, the exposed bone cavity where the tooth used to be is immediately covered with a blood clot. This clot protects the exposed bone from infection and helps it to heal. A dry socket occurs when the blood clot does not form properly or breaks off.

The first few days after the extraction are the most critical, during which time you must follow your dentist's advice to avoid damaging the blood clot.

Symptoms usually appear 3 days after the procedure and include severe, constant, and spontaneous pain triggered without touching the extraction site. It can also spread to the ear and the rest of your jaw. Over-the-counter painkillers usually do not help. Other symptoms may include bad breath and taste in the mouth, and swollen gums.

Socket infection

In other situations, debris or a poorly treated infection can remain in the socket after surgery. This allows bacteria to grow and cause a real infection.

In this case, symptoms appear more quickly (a few hours after the procedure). The pain is usually less severe and only occurs when you touch the extraction site.

You may find that the socket is filled with a whitish residue, which can be associated with pus discharge and an unpleasant odor. Your gums may also be swollen and inflamed.

Infection of the socket can also affect your general condition, causing fever, tiredness, and swollen lymph nodes under the lower jaw.

If you think you have a socket infection, see your dentist or surgeon as soon as possible. He will take the necessary steps to treat the condition.

If the infection is left untreated, it can progress to the underlying jaw bone, leading to diffuse osteitis.

2. Cellulitis

It occurs when the infection spreads to the soft tissues surrounding the wisdom tooth.

Symptoms may appear a few days after the procedure. These include swelling, redness, and a feeling of heat in the area.
Your general condition may also worsen, with fever, tiredness, and swelling of the lymph nodes in the neck.

Another less common form of infection is called delayed-onset infection (DOI). It occurs 3 to 4 weeks after the procedure and can have the same symptoms. DOI affects mainly the impacted lower wisdom teeth.

According to studies, its incidence ranges from 0.7% to 5.8%. Symptoms may include swelling, pain, difficulty opening the mouth, pus discharge, and fever.
Various factors contribute to its occurrence, including poor oral hygiene, accumulation of food debris, smoking, and certain medical conditions.

3. Sinusitis

The roots of the upper wisdom teeth can sometimes be close to or in contact with the sinuses. The sinuses are bony cavities in the cheek above the upper molars.

Removing these teeth can injure the sinuses, causing a condition called sinusitis.

Symptoms include pain and pressure around the eyes, cheeks, and nose, nasal obstruction, and drainage of pus.

Factors that increase the risk of infection after wisdom tooth extraction

Poor oral hygiene

Poor oral hygiene can lead to food debris accumulation in the space left by the extracted tooth, damaging the blood clot and leading to infection.


Smoking is one of the primary causes of dry sockets. Tobacco contains toxic substances that can slow down the healing process. It is recommended to stop smoking during the first 3 to 4 days to avoid infections.

Systemic diseases

Certain systemic diseases that weaken the immune system, such as diabetes, blood disorders, and HIV, increase the risk of infections after the extraction.

If you have a systemic disease, tell your surgeon about it. He may prescribe antibiotics before and after the procedure to avoid complications.


The risk of infections increases with age.

Not following your dentist's instructions

After wisdom teeth removal, you must carefully follow your surgeon's recommendations. If you don't, you may disrupt the healing process and increase the risk of infection. Your surgeon will advise you on oral hygiene and diet and may prescribe antibiotics depending on the situation.

Other complications of wisdom teeth removal

In addition to the infection, other complications may occur, among them:


Swollen blue, green or yellow lesions may appear after the wisdom teeth are removed. This is because a small blood vessel was cut during the procedure. The discolouration of the area usually fades within 10-15 days.

Loss of sensitivity

Surgery to remove a wisdom tooth can irritate the nerves in the area. This can cause numbness in some parts of the mouth, which can last from a few days to a few weeks. This is called paresthesia.
In rare cases, paresthesia may be permanent. If you experience numbness after the procedure, tell your dentist so that it can be monitored.

Temporomandibular joint pain

It is normal to have pain in the jaw after wisdom tooth extraction. This is due to the strain put on your jaws and joints during the procedure.

Limited opening of the mouth

After having a lower wisdom tooth removed, you may find that your mouth does not open as easily as it used to. This should only last a few days, but if it doesn't, see your dentist as soon as possible as it could be a more serious complication.


Bleeding after the procedure is almost inevitable. It may continue for several hours after you go home. However, if you are taking blood thinners or have a blood disorder, tell your surgeon. He will take the necessary steps to prevent excessive and uncontrollable bleeding.

What is considered normal after wisdom teeth removal?

The removal of wisdom teeth can cause some post-operative discomfort, which is normal and part of the healing process. This lasts for about 1 to 2 weeks, after which you can resume your normal diet and oral hygiene routine. Post-operative effects include:

Swelling or edema

This is a natural inflammatory process essential for healing. It occurs after any surgical procedure.
Your lips, cheeks and neck may be swollen. This will peak after 72 hours, then gradually decrease and disappear after a week.

Redness and heat sensation

They are also related to the inflammatory process. After surgery, blood vessels dilate to supply the surgical site with cells and nutrients needed for healing. These inflammatory reactions are normal and disappear after the first week.


Discomfort and pain after a wisdom tooth extraction may occur in the next few hours as the numbness wears off. This pain is expected to reach its maximum around 6 hours post-procedure.
Its intensity will depend on the technique used. For example, a surgical extraction will cause more intense and prolonged pain than a simple extraction.
The pain should subside as you heal. If it does not, contact your surgeon as it may be a postoperative complication.

Treatment of infection after wisdom teeth removal

The treatment of an infection after a wisdom tooth extraction depends on the type and severity of the infection.

The options can range from a simple prescription of antibiotics to a procedure performed by your dentist or surgeon.

If your socket is infected, your dentist will clean and flush the area to remove any debris or residue. He will then prescribe antibiotics and painkillers.

Soft tissue infection or cellulitis will be treated with antibiotics. If there is an accumulation of pus, your dentist will drain the area to relieve you.

For sinusitis, treatment consists of antiseptics and anti-inflammatories given through the nose, sometimes combined with antibiotics. The aim is to treat the inflammation or infection.
If the removal of the upper wisdom tooth has left a hole between the sinus and the mouth, it may heal on its own within a few weeks. If not, surgery will be needed to close the hole.

How to prevent infection after wisdom teeth removal?

To avoid complications, it is important to follow your dentist's instructions, whether the tooth being extracted is a wisdom tooth or any other tooth. Here are some of the recommendations to follow:

About your oral hygiene

It is necessary to maintain good oral hygiene after wisdom teeth extraction to keep the bacterial load in your mouth low and thus prevent infection of the surgical site.

For the first 24 hours, you should not brush your teeth, rinse your mouth vigorously, use an alcohol solution or disturb the extraction site, as this could damage the blood clot and disrupt the healing process.

After the first day, you can brush your teeth gently with a soft-bristled toothbrush and floss your teeth with an interdental cleaner.

Five days after surgery, you can rinse your mouth with a saltwater solution to promote healing (about ½ teaspoon of salt to 8 ounces of water).

Stop smoking

Smoking can cause dry socket due to the suction and pressure it exerts on the socket, disrupting blood clot formation. Nicotine also decreases blood flow, hindering the healing process. To prevent dry socket, it is recommended to abstain from smoking for the initial 3-4 days.

Have a rest

After wisdom teeth removal, you should rest and avoid physical activity for the first two to three days, as your body needs the energy to heal.

Adjust your diet

For the first 24 hours, choose a cold or lukewarm liquid diet, avoid sucking or drinking through a straw, and do not drink hot or spicy beverages to avoid burns. After 72 hours, choose a soft diet that requires little chewing effort and avoid hard, sticky foods that may accumulate at the surgical site. After two weeks, you can resume your usual diet.

Control your bleeding

After wisdom teeth extraction, some bleeding is to be expected for a few hours. To manage this, it is important to follow the post-operative instructions provided by your dentist. This may include biting on gauze pads for 20 minutes to promote blood clotting and avoid disrupting the clot with speaking or other actions. You should avoid rinsing your mouth aggressively, spitting or making any physical effort, as this can increase blood pressure and prolong bleeding. It is crucial to adhere to the medication regimen prescribed by your dentist during the recovery period.

Why keeping a wisdom tooth can sometimes be harmful?

If you've had your wisdom teeth removed, you may be wondering if it was worth it because of some of the post-operative discomfort.

Before doing anything, your dentist will carefully assess the risks associated with wisdom tooth removal. He will then explain the risk-benefit ratio so that you can make the right decision for you.

Wisdom teeth may never be a problem if they have grown in the right place. You may want to consider keeping them if they do not cause significant pain when they erupt, have enough space to fit, and do not interfere with the surrounding tissue. Unfortunately, most wisdom teeth become complicated, and 80% require extraction before 70 years of age.

In some situations, the wisdom tooth does not have enough room to emerge, which can cause many problems. In these cases, it is better to have them removed as soon as possible to avoid complications.

If you keep your wisdom teeth that have erupted abnormally, you run many risks, including the following:

  • If the wisdom tooth is partially or fully impacted: The main risk is an infection of the tissues surrounding the tooth, including the bone and gums. This can cause severe and throbbing pain. It can also damage the neighboring tooth by hitting its roots. More rarely, it can lead to the formation of a cyst or tumor.
  • The wisdom tooth can be difficult to clean: its position at the back of the mouth makes it difficult to clean with a toothbrush, increasing the risk of decay. If the decay reaches the pulp, which contains the tooth's nerves and blood vessels, it can cause infection and acute pain.
  • An abnormally erupted wisdom tooth can injure the cheek during chewing and cause painful ulcers.
  • The wisdom tooth can cause food debris to accumulate, attracting bacteria and leading to infection of the surrounding tissues and loosening of the neighboring tooth.
In summary, wisdom teeth are the last teeth to appear in the mouth and can cause a variety of problems if there is not enough space for them.
Removing wisdom teeth is sometimes the best way to prevent these problems, although there may be complications such as infection.
However, the risk of complications from the procedure is relatively small compared to leaving the tooth in place. It is important to understand and recognize potential complications and take steps to avoid them.

  1. Alveolar Osteitis: A Comprehensive Review of Concepts and Controversies https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2905714/
  2. Problems with erupting wisdom teeth: signs, symptoms, and management https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979926/
  3. Alveolar Osteitis https://www.ncbi.nlm.nih.gov/books/NBK582137/
  4. An Observational Cohort Study on Delayed-Onset Infections after Mandibular Third-Molar Extractions https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5457748/