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Pain in tooth
What - usually it is concentrated to perticular tooth but in many cases we feel radiating pain along the nerve course means part of jaw or face, even ear pain and headache.
Why - It is due to infected pulp or abscess below tooth, many times failed previous dental treatments.
Sensitivity in teeth
What - You may feel mild to moderate sensations / currents while using perticular tooth or side of jaw.
Why - It usually happens due to recession of gums, attrition in teeth, trauma from occlusion, abrasion in teeth ( excessive brushing), Erosion in teeth ( excessive intake of citrous food ) or Cavities in teeth.