What is an impacted wisdom tooth?
An impacted wisdom tooth is a third molar that cannot erupt fully or normally into the jaw because of lack of space, bone obstruction, or abnormal positioning. Impaction often leads to pain, infection, or damage to adjacent teeth and typically requires extraction.
Impaction occurs when a wisdom tooth (third molar) fails to emerge properly through the gum line due to physical obstruction, insufficient jaw space, or abnormal growth angle. Unlike other teeth, wisdom teeth often lack adequate room in the modern human jaw, causing them to remain partially or fully embedded in bone or soft tissue.
Impacted wisdom teeth are classified by their orientation in the jaw. A mesioangular impaction tilts toward the front of the mouth, the most common type. A horizontal impaction lies flat against the jaw bone. A vertical impaction grows straight up but remains trapped below the gum surface. Each type creates different challenges for eruption and removal.
Extraction is frequently recommended because impacted teeth trap food debris and bacteria, leading to infection, cyst formation, or periodontal disease. They may also damage the roots of adjacent molars or cause bone loss. Pain, swelling, and limited jaw opening are common symptoms. Even asymptomatic impacted teeth pose long-term risks and may worsen over time.
Evaluation by a dentist or oral surgeon involves clinical examination and imaging such as X-rays or CT scans to assess the tooth position, bone density, and nerve proximity. Extraction timing and technique depend on the specific classification and depth of impaction.