<unk><unk>  tooth with caries and cyst (green arrow) displacing inferior alveolar nerve (blue) Impactions completely covered by bone and soft tissue, do not communicate with the mouth, and have a low rate of clinically significant infection. Since the tooth never erupts, however, the dental follicle that surrounds the tooth does not degenerate during eruption, and can develop cysts or uncommon tumors over time. Estimates of the incidence of cysts or other neoplasms (almost all benign) around<unk><unk>  average at 3%, usually seen in people under the age of 40. This suggests that the chance of tumor formation decreases with age. left For partially<unk><unk>  in those over 20 year of age, the most common pathology seen, and the most common reason for<unk><unk>  removal, is pericoronitis or infection of the gum tissue over the<unk>  tooth. The bacteria associated with infections include Peptostreptococcus, Fusobacterium, and Bacteroides bacteria. The next most common pathology seen is cavities or tooth decay. Fifteen percent of people with retained<unk><unk>  exposed to the mouth have cavities on the<unk>  tooth or adjacent second molar due to a<unk>  tooth. The rate of cavities on the back of the second molar has been reported anywhere from 1% to 19% with the wide variation attributed to increased age. In five percent of cases, advanced periodontitis or gum inflammation between the second and third molars precipitates the removal of<unk><unk> . Among patients with retained, asymptomatic<unk><unk> , roughly 25% have gum infections (periodontal disease).<unk>  with periodontal pockets of greater than 5mm have tooth loss rates that start at 10<unk>  lost per 1000<unk>  per year at 5mm to a rate of 70<unk>  lost per year per 1000<unk>  at 11mm. The risk of periodontal disease and caries on third molars increases with age with a small minority (less than 2%) of adults age 65 years or older maintaining the<unk>  without caries or periodontal disease and 13% maintaining unimpacted<unk><unk>  without caries or periodontal disease. Periodontal probing depths increase over time to greater than 4 mm in a significant proportion of young adults with retained<unk>  which is associated with increases in serum inflammatory markers such as interleukin-6, soluble intracellular adhesion molecule-1 and C-reactive protein. Crowding of the front<unk>  is not believed to be caused by the eruption of<unk><unk>  although this is a reason many dental clinicians use to justify<unk><unk>  extraction.,
Impacted wisdom teeth
Toothache
Chattering teeth
Temporomandibular joint dysfunction
Melanocytic oral lesion
Facial trauma
Perforated eardrum
Enamel hypoplasia