Wisdom Tooth Picture
Wisdom tooth: One of the large molars in the very back of the jaw. The human jaw has changed in size over the course of evolution, and wisdom teeth are no longer needed, but they continue to erupt in many individuals. If the jaw is too small to accommodate them, they may cause pain or crowd other teeth out of position. The wisdom teeth may need to be surgically removed.
What are wisdom teeth?
Wisdom tooth is another name for any one of four third molars found in the permanent dentition (adult teeth). These teeth are the last or most posterior teeth in the dental arch. Although most people have wisdom teeth, it is possible for some or all of the third molars to never develop. It is also possible for a person to have more than four wisdom teeth. In many individuals, the wisdom teeth aren't visible because they have become impacted (not normally erupted through the gums) under the gingival tissue.
How do I know if I have wisdom teeth?
You know if you have wisdom teeth by examining your mouth and finding three permanent molars in each dental quadrant. However, if the tooth is impacted under the tissue, presence of the tooth needs to be verified by a radiograph. A panoramic radiograph is usually the preferred X-ray to help assess the angle of eruption and state of development of the tooth. Most wisdom teeth can be visualized erupting through the gingiva in early adulthood, between the ages of 16 to 23. Sometimes, a person will feel the effects of the wisdom teeth before they are able to visualize them in their mouth. Erupting wisdom teeth will usually produce a feeling of pressure or dull throbbing in the back of the jaws. Your general dentist will often be able to inform you of the condition of these erupting teeth.
Do all wisdom teeth need to be extracted?
Not all wisdom teeth need to be extracted. When a wisdom tooth erupts cleanly through the tissue without compromising the adjacent tooth, the wisdom tooth can be retained in the mouth with little concern as long as the person is able to brush, floss, and clean it thoroughly. The condition of the wisdom teeth changes a lot between the ages of 16 and 23; it is imperative that wisdom teeth are examined regularly by a dental professional to determine the proper diagnosis and course of action in this age group.
Sometimes the wisdom teeth cause pain, but a person can avoid extracting them with a few modifications of the surrounding tissues or oral hygiene habits. If there is a small flap of swollen gum tissue barely covering the back of the tooth, a person may have pain from biting down on that gum tissue. If there is otherwise enough room for the wisdom tooth, the gum tissue can be removed from the back of the tooth to remedy this problem. Changing the angle of tooth brushing and increasing the frequency of flossing both in front and behind the wisdom teeth can help keep the gum tissues healthy and avoid the potential of painful gingivitis or infection around the wisdom teeth.
There are certain situations, however, where extraction of wisdom teeth is absolutely necessary. The wisdom tooth may erupt at an angle such that the adjacent molar can become difficult to keep clean and free of dental caries. Sometimes the position of the wisdom tooth will cause deep periodontal pockets, gum disease or recession around the adjacent tooth, and should be removed before too much damage is caused to the much more critical second molars. If there isn’t sufficient room in the mouth for the wisdom teeth and they are trying to erupt, they may cause significant pressure on the surrounding teeth and tissues. This pressure can result in a bad headache, jaw pain/stiffness or tooth pain that is only resolved by removing the wisdom teeth. The pressure can give the impression that the wisdom teeth are causing crowded teeth. If the third molar has erupted through the tissue but is without opposing occlusion (contact with other teeth), extraction should still be considered. Considering the posterior position of an erupted wisdom tooth, these teeth are often difficult to keep clean. If wisdom teeth get tooth decay, it is usually best to extract them instead of removing the decay and fixing wisdom teeth with fillings, root canals, or crowns. These treatments that are indicated for the rest of the teeth, are often less successful in treating wisdom teeth due to their position in the back of the mouth.
Removal of a wisdom tooth is indicated if the tooth has partially erupted through the gingival tissue, causing inflammation and/or infection. This condition is called a partially erupted, or partially impacted wisdom tooth. A soft-tissue growth over a partially erupted wisdom tooth is referred to as an operculum. If bacteria become trapped under the operculum, an infection called pericoronitis can develop.
Medically Reviewed by a Doctor on 5/26/2016