Impacted Tooth

(Unemerged Tooth; Dental Impaction)


An impacted tooth is a tooth that is positioned against another tooth, bone, or soft tissue so that it is unlikely to fully erupt through the gums to reach its normal position in the mouth.
Wisdom Teeth (Third Molars)
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Impaction typically occurs in the third molars, also called the wisdom teeth. Wisdom teeth, which begin to develop around age 9, are most vulnerable to impaction because they are the last teeth to erupt, usually between the late teens and early 20s. By then, the jaw has stopped growing and may be too small to accommodate these 4 teeth.
An impacted tooth remains embedded in soft gum tissue or bone beyond its normal eruption time. The cause may be overcrowding. Other teeth may also become twisted, tilted, or displaced as the new teeth try to emerge.

Risk Factors

Impacted teeth are common. Factors that may increase your risk of impacted teeth include:


Some people with impacted teeth have no pain or other symptoms. In those who have symptoms, impacted teeth may cause:
Complications of untreated impacted teeth include:


You will be asked about your symptoms and medical history. A physical exam will be done. Tests may include:


If an impacted tooth causes no pain, inflammation, or infection, and does not affect mouth alignment, no treatment may be necessary.
If there are noticeable symptoms, surgery is usually recommended to remove all impacted teeth, preferably while the person is young. This may be done by a dentist under local anesthesia if the tooth is exposed and can be easily removed in one piece. For difficult extractions, your dentist may refer you to an oral surgeon. In these cases, general anesthesia or an IV sedative may be used. Your dentist may recommend following until surgery can be scheduled:


There are no current guidelines to prevent impacted teeth.


The American Association of Oral and Maxillofacial Surgeons

Mouth Healthy—The American Dental Association


Canadian Dental Association

Canadian Dental Hygienists Association


Impacted tooth. EBSCO DynaMed website. Available at: Updated August 11, 2014. Accessed September 30, 2014.

Wisdom teeth. American Dental Association Mouth Healthy website. Available at: Accessed August 10, 2015.

Wisdom teeth management. American Association of Oral and Maxillofacial Surgeons website. Available at: Accessed August 10, 2015.

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