TMJ, or temporomandibular joint, is a hinge joint that connects the jaw to the skull. This joint controls the movements that allow the lower jaw to open, close, and move from side to side. The flexible movements of the TMJ are what enables a person to speak, chew, yawn, etc.
In essence, the TMJ is one of the strongest joints in the human body, but there are instances when the TMJ becomes overstressed. When this happens, a person develops temporomandibular disorder (TMD).
http://www.reedortho.com/blog/2014/01/if-experiencing-tmd-symptoms-visit-an-aurora-orthodontics-office
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