ĭental work that involves prolonged mouth opening or an injection can cause jaw pain, which should subside in a day or two. Tooth decay with cavities (dental caries) can cause a toothache, sensitivity of the tooth to cold, heat, sweet foods or pressure and, occasionally, localized jaw pain. Causes include anxiety, sleep apnea, uneven bite and missed tooth. Teeth grinding at night (bruxism) can result in a temporary jaw pain in the morning and excessive wearing of the teeth. Individuals with TMD also often suffer from insomnia, headache, migraine, chronic lower back pain, fibromyalgia, chronic fatigue syndrome (CFS), irritable bowel syndrome, interstitial cystitis, dizziness and ringing in the ears (tinnitus). Symptoms include pain in front of the ear, jaw stiffness, decreased range of motion of the jaw ( lockjaw or trismus) and clicking, popping or grating sounds during the jaw movements Causes include increased tension in the chewing muscles due to their overuse (gum chewing, eating hard-to-chew foods, nail biting, singing), poor posture, psychological stress (anxiety), sleep apnea or sleep deprivation, and disorders of the temporomandibular joints. Temporomandibular disorder (TMD) refers to pain and dysfunction of the chewing muscles and temporomandibular joints (TMJ), which connect the temporal bones of the skull with he jawbone (mandible).
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