The pain may be felt over the angle of the jaw (masseter) or in the temple (temporalis), and may be described as a headache or an aching jaw. Most (but not all) bruxism includes clenching force provided by masseter and temporalis muscle groups; but some bruxers clench and grind front teeth only, which involves minimal action of the masseter and temporalis muscles. The temporomandibular joints themselves may also become painful, which is usually felt just in front of the ear, or inside the ear itself. Clicking of the jaw joint may also develop. The forces exerted on the teeth are more than the periodontal ligament is biologically designed to handle, and so inflammation may result. A tooth may become sore to bite on, and further, tooth wear may reduce the insulating width of enamel and dentin that protects the pulp of the tooth and result in hypersensitivity, e.g. to cold stimuli. The relationship of bruxism with temporomandibular joint dysfunction (TMD, or temporomandibular pain dysfunction syndrome) is debated. Many suggest that sleep bruxism can be a causative or contributory factor to pain symptoms in TMD. Indeed, the symptoms of TMD overlap with those of bruxism. Others suggest that there is no strong association between TMD and bruxism. A systematic review investigating the possible relationship concluded that when self-reported bruxism is used to diagnose bruxism, there is a positive association with TMD pain, and when stricter diagnostic criteria for bruxism are used, the association with TMD symptoms is much lower.
Classified may refer to:

General
Classified information, material that a government body deems to be sensitive
Classified advertising or "classifieds"

Music
Classified (rapper) (born 1977), Canadian rapper
The Classified, a 1980s American rock band featuring Steve Vai
Classified Records, an American record label

Albums
Classified (Bond album), 2004
Classified (Classified album), 2013
Classified (Sweetbox album), 2001
Classified, by James Booker, 1982

Songs
"Classified", by C. W. McCall from Wolf Creek Pass, 1975
"Classified", by the Orb from Metallic Spheres, 2010
"Classified", by Pete Townshend from the compilation Glastonbury Fayre, 1972
"Classifieds", by the Academy Is... from Almost Here, 2005

Other media
Classified (1925 film), an American silent film
Classified: The Edward Snowden Story, a 2014 Canadian film
Classified: The Sentinel Crisis, a 2005 video game for the Xbox

See also
Classification (disambiguation)
Classifier (disambiguation)