A decreased sensation or numbness when a painful stimuli is applied. This is generally due to a bruising, with subsequent swelling or a sensory nerve, as a result of jaw surgery or an injury. Also known as "hypoesthesia".
Hyperesthesia (or Hyperaesthesia) is a condition that involves an abnormal increase in sensitivity to stimuli of the senses. Stimuli of the senses can include sound that one hears, foods that one tastes, textures that one feels, and so forth.