What Is an Impacted Wisdom Tooth?
An impacted wisdom tooth is a third molar that cannot fully break through the gum tissue because it is blocked by bone, soft tissue, or the tooth in front of it. Wisdom teeth are the last teeth to develop, typically emerging between ages 17 and 25. Many people do not have enough room in their jaw to accommodate these teeth.
When a wisdom tooth is impacted, it may stay completely buried in the jawbone, partially poke through the gum, or press into the second molar in front of it. Partial eruption is especially problematic because the opening in the gum creates a pocket where bacteria collect, leading to infection and decay.
Types of Wisdom Tooth Impaction
The direction and depth of the impacted wisdom tooth determine the type of impaction and the complexity of removal. Your oral surgeon will use X-rays or a CBCT scan to classify the impaction before recommending treatment.
- Mesial impaction: The tooth is angled forward, pushing into the second molar. This is the most common type of impaction and frequently causes crowding or damage to the adjacent tooth.
- Distal impaction: The tooth is angled toward the back of the mouth, away from the second molar. Distal impactions are less common and may not always require removal if they are not causing symptoms.
- Horizontal impaction: The tooth is lying completely on its side within the jawbone. Horizontal impactions often require a more involved surgical approach because the tooth must be sectioned into pieces for removal.
- Vertical impaction: The tooth is positioned correctly but remains trapped below the gum line, usually because there is not enough space for it to erupt. Vertical impactions are sometimes monitored if they are not causing problems.
Partial vs. Full Bony Impaction
A partially impacted wisdom tooth has broken through part of the gum but cannot fully emerge. The exposed portion is difficult to clean, making it prone to decay and gum infection (pericoronitis). A fully impacted wisdom tooth remains entirely beneath the gum and is encased in bone. Full bony impactions are typically more complex to remove but may cause fewer symptoms until a problem develops.
Symptoms of an Impacted Wisdom Tooth
Some impacted wisdom teeth cause no symptoms at all and are discovered on routine dental X-rays. Others produce noticeable signs that something is wrong. If you have any of the following symptoms near the back of your mouth, see your dentist or an oral surgeon for evaluation.
- Pain or tenderness in the jaw near the back teeth, especially when chewing or opening your mouth wide
- Swollen, red, or bleeding gums around the partially erupted tooth
- Difficulty opening your mouth fully (trismus)
- A bad taste or persistent bad breath caused by bacteria collecting around the partially exposed tooth
- Pain that radiates to the ear, temple, or neck on the affected side
- Swelling in the jaw or cheek
- Headaches, particularly on the side of the impacted tooth
Pericoronitis: Infection Around the Wisdom Tooth
Pericoronitis is an infection of the gum tissue surrounding a partially erupted wisdom tooth. Food and bacteria become trapped under the gum flap covering the tooth, causing inflammation and infection. Symptoms include localized pain, swelling, difficulty swallowing, and sometimes a low-grade fever. Pericoronitis often recurs until the impacted wisdom tooth is removed.
Risks of Leaving an Impacted Wisdom Tooth Untreated
Not every impacted wisdom tooth needs to be removed. However, when an impacted tooth is causing symptoms or showing signs of pathology on imaging, delaying treatment can lead to more serious problems.
- Damage to adjacent teeth: A mesially impacted wisdom tooth can press against the second molar, causing root resorption, decay, or bone loss on the neighboring tooth.
- Cyst formation: The sac of tissue surrounding an impacted tooth can fill with fluid and form a dentigerous cyst. Over time, cysts can hollow out sections of the jawbone and damage nearby teeth and nerves.
- Recurrent infections: Pericoronitis around a partially erupted wisdom tooth tends to flare repeatedly. Each episode can be more severe and harder to treat than the last.
- Tooth decay: A partially erupted wisdom tooth is nearly impossible to keep clean. Both the wisdom tooth and the adjacent second molar are at high risk for cavities.
- Gum disease: Chronic inflammation around an impacted tooth can contribute to periodontal disease in the back of the mouth.
Treatment: Surgical Extraction of an Impacted Wisdom Tooth
Surgical extraction is the standard treatment for a symptomatic or problematic impacted wisdom tooth. An oral surgeon performs this procedure, typically in an office setting with local anesthesia, IV sedation, or general anesthesia depending on the complexity of the case and patient preference.
During the procedure, the oral surgeon makes an incision in the gum to expose the tooth and bone. If bone is covering the tooth, the surgeon removes the necessary amount of bone to access it. For horizontally impacted or deeply buried teeth, the surgeon may section the tooth into smaller pieces to make removal easier and reduce the amount of bone that needs to be taken out. Once the tooth is removed, the site is cleaned, and the gum is sutured closed.
Anesthesia and Sedation Options
Most impacted wisdom tooth extractions are performed under IV sedation (sometimes called twilight sedation), which keeps you in a deeply relaxed state where you are unlikely to remember the procedure. Local anesthesia numbs the surgical site. General anesthesia, where you are fully asleep, is typically reserved for complex cases or patients with significant dental anxiety. Your oral surgeon will discuss which option is appropriate based on the number of teeth being removed and the difficulty of the impaction.
Removing Multiple Wisdom Teeth at Once
If more than one wisdom tooth is impacted, most oral surgeons recommend removing all problematic wisdom teeth in a single appointment. This means one recovery period instead of multiple procedures. Removing all four wisdom teeth at once is a common and routine approach.
Recovery After Impacted Wisdom Tooth Removal
Most patients recover from impacted wisdom tooth surgery within 7 to 10 days. The first 3 days are typically the most uncomfortable. Following your oral surgeon's aftercare instructions closely can reduce your risk of complications and speed healing.
Day-by-Day Recovery Timeline
- Day 1: Bleeding is normal for the first few hours. Bite gently on gauze pads as directed. Apply ice packs to the outside of your cheeks (20 minutes on, 20 minutes off) to reduce swelling. Eat only soft, cool foods like yogurt or applesauce.
- Days 2-3: Swelling typically peaks on day 2 or 3. Continue ice packs and take prescribed pain medication or over-the-counter anti-inflammatory medication as directed. Stick to soft foods. Do not use a straw, spit forcefully, or smoke.
- Days 4-7: Swelling and bruising begin to fade. You can gradually add semi-soft foods. Most patients return to work or school within 3 to 5 days.
- Days 7-10: Sutures dissolve or are removed by your surgeon. Most discomfort has resolved. Avoid hard, crunchy, or spicy foods until the surgical sites are fully closed.
- Weeks 3-4: The soft tissue is usually fully healed. The bone underneath continues to remodel over the following months.
Dry Socket Prevention
Dry socket (alveolar osteitis) occurs when the blood clot that forms in the extraction site is dislodged or dissolves too early, exposing the underlying bone and nerves. It causes severe, radiating pain that typically starts 2 to 4 days after surgery. To reduce your risk, avoid smoking for at least 72 hours, do not drink through a straw for the first week, and follow all aftercare instructions from your oral surgeon. If you develop increasing pain several days after surgery, contact your oral surgeon promptly.
Impacted Wisdom Tooth Removal Cost
The cost of removing an impacted wisdom tooth depends on the type of impaction, the need for sedation, and your geographic location. A simple extraction of a partially erupted wisdom tooth typically ranges from $225 to $400 per tooth. Surgical removal of a fully bony impacted tooth can cost $400 to $600 or more per tooth. Costs vary by location, provider, and case complexity.
If all four wisdom teeth are removed in one visit, total costs often range from $1,000 to $3,000. IV sedation or general anesthesia is an additional fee, typically $250 to $600 for the sedation portion.
Most dental insurance plans cover a portion of wisdom tooth extraction when the procedure is deemed medically necessary. Check with your insurance provider about your specific coverage and out-of-pocket costs. Many oral surgery practices also offer payment plans.
When to See an Oral Surgeon
Your general dentist can identify an impacted wisdom tooth on a panoramic X-ray and refer you to an oral surgeon for evaluation and treatment. An oral surgeon is the specialist trained to perform surgical extractions, manage sedation, and handle complications like cysts or nerve proximity.
You should see an oral surgeon if you have jaw pain near the back of your mouth, recurrent infections around a partially erupted wisdom tooth, or if your dentist has identified an impacted tooth on X-rays. Early evaluation, typically in the late teens or early twenties, often allows for simpler extraction before the roots are fully formed and the bone is denser.
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