Wisdom Tooth Removal: What Happens When You Ignore Impacted Teeth For Long?

What Is an Impacted Wisdom Tooth?

Wisdom teeth — the third molars — are the last permanent teeth to develop, typically erupting between the ages of 17 and 25. In most modern mouths, there is simply not enough space at the back of the jaw to accommodate them properly. When a wisdom tooth cannot fully erupt into its correct position, it becomes impacted — trapped against the jawbone, the adjacent molar, or the overlying gum tissue.

Impacted wisdom teeth are classified by their orientation:

• Mesial impaction — the tooth is angled forward toward the second molar. The most common type and often the most damaging to the adjacent tooth
• Horizontal impaction — the tooth lies completely sideways, pointing directly into the root of the second molar
• Vertical impaction — the tooth is correctly oriented but cannot fully emerge through the bone or gum
• Distal impaction — the tooth is angled backward toward the back of the jaw

Some impacted wisdom teeth partially break through the gum (partially impacted), while others remain entirely beneath the gum and bone (fully impacted). Both types carry significant risks when left untreated — the difference is that partially impacted teeth often cause symptoms sooner, while fully impacted teeth can cause extensive damage silently for years.

The Consequences of Ignoring Impacted Wisdom Teeth

1. Pericoronitis — Recurrent Infection of the Gum Flap

When a wisdom tooth partially breaks through the gum, a flap of gum tissue (called the operculum) often covers part of the crown. Food particles and bacteria accumulate beneath this flap — an environment that is nearly impossible to clean adequately with a toothbrush. The result is pericoronitis: an infection of the soft tissue surrounding the partially erupted tooth.

Pericoronitis produces:

• Swelling and redness of the gum tissue behind the last molar
• Significant pain that often radiates to the ear, jaw, and throat
• Difficulty opening the mouth (trismus)
• An unpleasant taste or foul odour from the infected area
• Fever and swollen lymph nodes in severe cases

Pericoronitis frequently recurs. Each episode is typically treated with antibiotics and irrigation — but these measures address the infection, not the cause. As long as the partially impacted tooth and its gum flap remain, the infection returns. Repeated courses of antibiotics carry their own risks, and the repeated inflammatory cycles cause cumulative damage to surrounding tissue and bone.

2. Damage to the Adjacent Second Molar

This is one of the most serious — and most underappreciated — consequences of leaving impacted wisdom teeth untreated. A wisdom tooth pressing against the root of the adjacent second molar exerts continuous mechanical pressure, causing:

• External root resorption — the root of the second molar is literally dissolved by pressure from the impacted wisdom tooth. This damage is often irreversible and may ultimately require extraction of the second molar as well
• Cavity formation on the second molar — the contact point between the impacted wisdom tooth and the second molar creates a space that is impossible to clean, allowing decay to develop on the root surface of the adjacent tooth
• Bone loss between the two teeth — the chronic inflammation around the impaction creates a periodontal defect between the wisdom tooth and second molar, resulting in bone loss that persists even after the wisdom tooth is eventually removed

The critical point here is that by the time this damage is detected on an X-ray, it has already occurred. The second molar — which is a far more important functional tooth than the wisdom tooth — has been permanently compromised. Early extraction of the impacted wisdom tooth prevents this damage entirely.

3. Dental Cysts and Tumours

Every impacted wisdom tooth develops within a follicular sac — a small fluid-filled structure that surrounded the tooth as it formed. When a wisdom tooth remains impacted, this sac can enlarge into a dentigerous cyst: a fluid-filled lesion that slowly expands within the jawbone.

Dentigerous cysts:

• Expand gradually and silently — often producing no symptoms until they are large
• Destroy surrounding jawbone as they enlarge
• Can displace neighbouring teeth, nerve canals, and anatomical structures
• Occasionally transform into more aggressive lesions — including odontogenic tumours — if left untreated for very long periods
• Require surgical removal of the cyst and often reconstruction of the affected bone

Regular dental X-rays — including panoramic radiographs that show the full jaw — are essential for detecting cystic change around impacted wisdom teeth before they become large. This is one of the most compelling clinical reasons to have impacted wisdom teeth monitored even when they produce no symptoms.

4. Crowding and Shifting of the Front Teeth

Whether impacted wisdom teeth directly cause crowding of the front teeth is a longstanding debate in dentistry. The current evidence suggests that while wisdom teeth are not the primary driver of crowding, the forward pressure they exert as they push against the dental arch can contribute to or exacerbate shifting — particularly in patients who have had orthodontic treatment and are relying on their alignment being maintained.

For patients who have invested in orthodontic treatment — whether with Invisalign or traditional braces — removal of impacted wisdom teeth is often recommended to protect the alignment achieved through treatment. The risk of post-orthodontic relapse due to wisdom tooth pressure is a real consideration in treatment planning.

5. Abscess and Spread of Infection

An untreated pericoronitis or decay around an impacted tooth can progress to a full dental abscess — a bacterial infection that spreads into the surrounding bone and soft tissue. In the lower jaw, dental abscesses near wisdom teeth are particularly concerning because of their anatomical proximity to the floor of the mouth and the neck.

In rare but well-documented cases, untreated dental infections from impacted wisdom teeth have spread to the deep spaces of the neck — a life-threatening condition called Ludwig’s angina — or ascended into the intracranial compartment. These outcomes are uncommon, but they are a documented consequence of long-term neglect of impacted wisdom teeth that become infected.

According to the Canadian Dental Association, early assessment and timely management of impacted wisdom teeth prevents the vast majority of these serious complications — making proactive evaluation one of the most important preventive actions a patient can take.

6. Chronic Jaw Pain and TMJ Complications

Impacted wisdom teeth — particularly those in the lower jaw — exert chronic pressure on surrounding structures, including the jaw joint (temporomandibular joint, or TMJ). Patients with long-standing impacted wisdom teeth frequently report:

• Persistent jaw aching that is difficult to localize
• Headaches originating from the jaw area
• Difficulty fully opening the mouth
• Clicking or discomfort in the TMJ area

While TMJ disorders have multiple causes, impacted wisdom teeth are a contributing factor that is entirely removable. Many patients who have wisdom teeth extracted report significant improvement in chronic jaw discomfort that they had attributed to stress or tension.

When Is the Right Time to Have Wisdom Teeth Removed?

The optimal timing for wisdom tooth removal is a question Dr. Mohi addresses at every wisdom tooth assessment. The answer depends on:

• The degree of impaction and the tooth’s current position relative to adjacent structures
• Whether symptoms such as pain, swelling, or infection are present
• Evidence of cyst formation, root resorption of the adjacent tooth, or bone loss on X-ray
• The patient’s age — younger patients (late teens to mid-20s) have shorter roots, softer bone, and faster healing than older patients, making early removal significantly less complex
• The patient’s overall health and any medical conditions that affect surgical risk

What Does Wisdom Tooth Removal Involve?

Many patients delay extraction because they fear the procedure. Understanding what the process actually involves almost always reduces this anxiety significantly:

• Assessment and imaging — a panoramic X-ray or 3D CT scan is taken to assess root anatomy, proximity to the inferior alveolar nerve, and surgical complexity
• Local anesthesia — the treatment area is fully numbed before any instrumentation begins. Sedation dentistry is available for anxious patients
• Surgical removal — depending on the impaction type, the tooth may be sectioned into pieces for safer, less traumatic removal. Most procedures take 20 to 45 minutes per tooth
• Recovery — soft tissue healing takes 1 to 2 weeks. Bone remodeling continues for several months. Most patients return to normal activity within 3 to 5 days

Post-operative care instructions are provided at Great Lakes Dentistry before you leave the chair — covering diet, medication, oral hygiene, and warning signs to watch for during recovery.

Trusted Resources on Wisdom Teeth and Oral Surgery

• Canadian Dental Association — Oral Health Resources
• Health Canada — Dental Care Guidelines
• World Health Organization — Oral Health Facts

Frequently Asked Questions: Wisdom Tooth Removal and Impacted Teeth

Final Thoughts