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What does a tooth abscess look like? To some people, an abscessed tooth may look like a gum abscess. Stages of the infection vary, with symptoms fluctuating depending on how long you’ve had an abscessed tooth, how “bad” the bacterial infection is, and the extent of the tooth deterioration. Although it’s possible to treat abscessed teeth, the actual tooth abscess stages will eventually reach a point where it’s physically impossible to repair or save your anatomical tooth.



What is a Tooth Abscess?

Every tooth has a living, functional nerve and blood vessels running down the root’s centre. The nerve is responsible for “feeding” your tooth structure and keeping it alive. But if that nerve or tissue supply is somehow compromised or infected, you’ll develop a periapical abscess.

However, there are other types of abscesses that aren’t directly related to the nerve of the tooth. These abscesses are also severe dental infections, but with gum abscess stages looking different than a traditional tooth abscess. The type of infection you have will impact your dentist’s treatment recommendations.

Gingival Abscess (Gum Abscess)

Scientifically speaking, it’s possible to get an abscess practically anywhere in our body. In the case of a gingival abscess, the infection is strictly localised inside our gum tissues (and not the tooth itself.) This could be due to some oral infection, medical condition, trauma, or lack of home care.

Periodontal Abscess

Symptoms of a Dental AbscessesIf you have severe periodontal (gum) disease, the gum and bone tissues adjacent to your tooth roots become severely infected. Although traditional symptoms include pocketing, tartar buildup, and bad breath, some people may also develop periodontal abscesses, where fluid drains out of the gums when pressure is applied to the tooth.

Periapical Abscess

These are the most common types of dental abscesses. They result from an infected or dying tooth nerve, with a developing cyst at the tip of the tooth root that ultimately drains through the gums and into the mouth. Periapical abscesses can only be managed with endodontic therapy.

What Does An Dental Abscess Look Like?

Depending on the type of dental abscess you have, you’ll usually experience symptoms of swollen gums, fistulas (small pimple-like sores) on the tissue, and even visible pus that drains from that location. If you have a periapical abscess, the cyst around the root will usually be visible on a dental x-ray. Abscesses within the gums typically accompany red, inflamed tissues that bleed easily and are tender to the touch.

It’s extremely common for tooth abscesses to “come and go”, with visible symptoms for a few days and then gone the next. Whereas if it’s simply something like an ulcer, the blister tends to appear on otherwise completely healthy gum tissue and heals within a week or two.

5 Dental Abscess Stages

Periapical abscesses are preventable and the most common type of dental abscess. Depending on how quickly you address the situation, your tooth will experience the following five tooth abscess stages of infection. Although it may sound obvious, the earlier treatment is typically the best and most affordable solution. Delaying care—even in the absence of symptoms—will only compound the progression of oral disease and limit your treatment options.

Enamel Decay

Aside from traumatic injuries, almost every abscessed tooth results from enamel decay. The outermost layer of your tooth is made of extremely dense enamel. Once a cavity has begun to erode your tooth enamel, it is fast on its way to becoming abscessed unless you treat it ASAP.


Not all cavities have noticeable symptoms. But the most obvious ones include sensitivity, pain, darkening of your tooth enamel, rough edges, and visible holes in your teeth on your dental X-rays.


The only treatment for an active cavity is to have your dentist clean the decay and rebuild your tooth with a dental filling. Cavities are not reversible, you cannot treat them at home, and they will only continue to grow if they go without professional attention.

Dentin Decay

Dental Abscess FormationUnderneath the enamel is a layer of the tooth called dentin. Dentin is much less dense than enamel, so once a cavity reaches this layer, it can spread alarmingly fast. The dentin is the bulk of the tooth surrounding the inner nerve tissues. Dentin decay also tends to be much more sensitive than enamel.


Once a cavity reaches the dentin, your tooth will likely be far more sensitive. You might notice something feeling “off” whenever you chew. Floss will usually get caught whenever you’re cleaning around your tooth if the cavity is between teeth. There’s also a high risk of the tooth breaking whenever you bite.


Depending on how much tooth structure is involved, a dental filling, inlay, onlay, or crown will be necessary. Without treatment, the infected pulp is inevitable.

Pulp Decay

After a cavity has ruptured the tooth enamel and spread into the dentin, it is only a matter of time before the decay reaches the nerve in the middle of the tooth. Once active decay contaminates the pulp/nerve tissues, the entire tooth becomes compromised. Unless treated immediately, tooth loss is inevitable.


Once the pulp tissue inside of a tooth is infected, sensitivity to hot foods and drinks is common. More than likely, teeth will be hypersensitive to everyday activities like eating, drinking, and brushing teeth. Sharp or dull toothaches are common.


The only treatment for an infected pulp tissue is endodontic therapy. During a root canal, the nerve is removed, and the chamber is sealed off with a special filling material to prevent bacteria from re-entering the canal. You’ll also need a crown on top of the tooth. A pulpotomy (“baby root canal”) is usually the best alternative for children.

Dental Abscess Formation

Shortly after decay reaches the tooth nerve, bacteria become trapped inside the pulp chamber. This leads to the deterioration of the nerve, the development of a pocket of pus, and a rise in inflammation. There are only two directions for the tooth infection to drain, one of which is through the opening at the tip of the root.


Shortly after the nerve of a tooth becomes infected, the inflammation will lead to excess fluid that needs to drain out of the tooth. A fistula—or small pimple on the gums—allows the pus to drain through the bones and gum tissue to ease the pressure inside the root. As the tooth begins to die, it will gradually turn dark and become more brittle. There could be severe tooth pain or none (because the nerves are no longer functioning properly.)


Root canal treatment will eliminate the source of the tooth abscess and prevent total tooth loss and additional discomfort.

Serious Complications

An untreated tooth abscess can easily expand into adjacent anatomical structures. In some cases, these have been known to cause brain infections and facial swelling and require hospitalisation. Loss of the tooth is common, as is an infection in adjacent teeth.


Facial swelling, sepsis, fever, and in extremely rare and advanced cases, this life-threatening infection could result in death because of a brain infection.


You will require hospitalisation and intravenous drug treatment to gain control over systemic infections throughout the bloodstream and secondary organs. Once your medical condition is stabilised, the tooth is extracted.

Symptoms of a Dental Abscesses?

It’s really important to know that tooth abscess symptoms can vary from person to person. But in a broad sense, here’s what you can usually expect to see or experience at some point:

Early tooth abscess stages:

  • Sensitivity
  • Tooth pain
  • Tooth decay, cracked teeth, or gum disease
  • The enlarged nerve on your dental X-ray
  • Darkening around the root of your tooth (as seen on your X-ray)

Late tooth abscess stages:

  • A bad taste in your mouth
  • Visible pus draining from somewhere around your tooth
  • The tooth moves when pressure is applied
  • Darkening of your tooth
  • A fistula (pimple) on the gums next to the tooth root
  • Swollen or red gum tissues in that area

What Causes Dental Abscesses?

Almost all dental abscesses are the result of untreated tooth decay. Since cavities are bacterial infections, they continue to expand into adjacent tooth structures unless your dentist physically treats them.

Deep cracks in teeth can also contribute to an abscessed nerve. For instance, if a traumatic injury during an athletic event or car accident involves blunt trauma to the mouth, it could fracture the tooth and allow bacteria to enter the nerve chamber.

Untreated gum disease can also cause periodontal (gum) abscesses. These infections are caused by a lack of regular preventative care, heavy tartar buildup underneath the gum tissues, and inadequate brushing and flossing.

Unfortunately, many assume that if their tooth doesn’t hurt or there isn’t anything visibly wrong with it, they don’t need to treat the cavity or crack. So this allows the condition to go untreated, meaning more and more bacteria can enter the tooth.

Early screenings, regular dental exams, and diagnostic digital X-rays can eliminate the cause and progression of a dental abscess. Sadly, many people just don’t listen to their dentist’s recommendations regarding abscessed teeth, especially when there isn’t any noticeable pain.

Dental Abscess Treatments

Dental Abscess TreatmentsHow to treat a tooth abscess? Depending on the type of dental abscess you have and its severity, you’ll need one of the following treatments:

  • Antibiotic
  • Endodontic Therapy
  • Scaling and Root Planing
  • Tooth Extraction

Risk Factors of an Untreated Dental Abscess

Not to scare you or anything, but in a total worst-case scenario, untreated tooth abscesses can allow infection to spread into your face and brain. There are documented cases where untreated dental abscesses resulted in death. This scenario is a big issue in children, especially when abscessed baby teeth aren’t treated promptly.

Thankfully, early dental care keeps most people out of the hospital. But if you try to avoid trips to the dentist’s office, most untreated abscesses typically lead to painful emergencies and tooth loss.

Tooth loss is usually the result of the tooth abscess getting so bad that there’s not enough structure that’s left to restore. At that point, your dentist’s hands are tied, and the only way to eliminate the tooth infection is to pull the tooth entirely. Or you lose your tooth because of the throbbing pain. If you need short-notice emergency treatment, tooth extraction can provide a fast way to eliminate the source of the infection, especially if you’re dead-set against a root canal treatment.

But with tooth loss comes a whole plethora of additional issues. Like displacement of other teeth because they start to tilt and drift out of alignment when one of their partners goes missing. As teeth start to move out of place, it contributes to TMJ issues, irregular wear patterns, bone loss, and future expenses related to tooth replacement.


Talk To Your Dentist

If you have an abscessed tooth or have questions about which tooth abscess stages you go through, always talk to your dentist. They’ll need to take an X-ray of your tooth to make a firm diagnosis, even if there are visible symptoms. The X-ray will help determine the extent of internal damage and which steps should come next. Such as an extraction vs. a root canal treatment.

And if you don’t feel comfortable with a dentist’s recommendations to get a root canal or deep cleaning, always seek a second opinion. It’s better to be cautious than ignore a potentially abscessed tooth. In most cases, a second opinion visit is covered by your insurance because your carrier knows you’re probably going to go with the more conservative of the two.

Try not to wait for more severe tooth abscess stages before seeking out a professional opinion. See an emergency dentist at the earliest clue that there’s something wrong with your tooth.


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