<unk>  is a condition where the third molars<unk><unk>  are prevented from erupting into the mouth. This can be caused by a physical barrier, such as other<unk> , or when the tooth is angled away from a vertical position. Completely unerupted<unk><unk>  usually result in no symptoms, although they can sometimes develop cysts or neoplasms. Partially erupted<unk><unk>  can develop cavities or pericoronitis. Removal of<unk>  is advised in the case of certain pathologies, such as nonrestorable caries or cysts.<unk><unk>  likely become<unk>  because of a mismatch between the size of the<unk>  and the size of the jaw.<unk>  are classified by their direction of impaction, their depth compared to the biting surface of adjacent<unk>  and the amount of the tooth's crown that extends through gum tissue or bone.<unk>  can also be classified by the presence or absence of symptoms and disease. Screening for the presence of<unk><unk>  often begins in late adolescence when a partially developed tooth may become<unk> . Screening commonly includes a clinical examination as well as x-rays such as panoramic radiographs. Infection resulting from<unk>  can be initially treated with antibiotics, local debridement or surgical removal of the gum overlying the tooth. Over time, most of these treatments tend to fail and patients develop recurrent symptoms. The most common treatment for recurrent pericoronitis is<unk>  tooth removal. The risks of<unk>  tooth removal are roughly proportional to the difficulty of the extraction. Sometimes, when there is a high risk to the inferior alveolar nerve, only the crown of the tooth will be removed (intentionally leaving the roots) in a procedure called a coronectomy. The long-term risk of coronectomy is that chronic infection can persist from the tooth remnants. The prognosis for the second molar is good following the<unk><unk>  removal with the likelihood of bone loss after surgery increased when the extractions are completed in people who are 25 years of age or older. A treatment controversy exists about the need for and timing of the removal of disease-free<unk> . Supporters of early removal cite the increasing risks for extraction over time and the costs of monitoring the<unk><unk> . Supporters for retaining<unk><unk>  cite the risk and cost of unnecessary surgery. The condition affects up to 72% of the Swedish population.<unk><unk>  have been described in the ancient texts of Plato and Hippocrates, the works of Darwin and in the earliest manuals of operative dentistry. It was the meeting of sterile technique, radiology, and anesthesia in the late 19th and early 20th centuries that allowed the more routine management of<unk> . Video summary
Impacted wisdom teeth
Toothache
Chattering teeth
Temporomandibular joint dysfunction
Melanocytic oral lesion
Facial trauma
Perforated eardrum
Enamel hypoplasia