Dentine hypersensitivity is sensation felt when the nerves inside the dentin of the teeth are exposed to the environment. The sensation can range from irritation all the way to intense, shooting pain. This sensitivity can be caused by several factors, including wear, decaying teeth or exposed tooth roots. The effects of gum disease can lower the gumline and expose the roots. This will in turn expose the dentine of the root which contains the tubules leading directly to the nerve. Hot, cold, air pressure, drying, sometimes sweet foods can cause pain. A special paste is available that can be applied to provide some relief from this condition.