What makes my teeth sensitive to cold?

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  A American Dental Association answered

  Cavities and fractured teeth can cause sensitive teeth. But if your dentist has ruled these problems out, then worn tooth enamel, a cracked tooth or an exposed tooth root may be the cause.
  
  Your teeth contain small hollow tubes or canals, called dentin, that when it loses its protective covering allow heat and cold or acidic or sticky foods to stimulate the nerves and cells inside the tooth. This causes hypersensitivity and occasional discomfort. Fortunately, the irritation does not cause permanent damage to the pulp. Dentin may be exposed when gums recede. The result can be hypersensitivity near the gum line.
  
  Proper oral hygiene is the key to preventing gums from receding and causing sensitive-tooth pain. If you brush your teeth incorrectly or even over-brush, gum problems can result. Ask your dentist if you have any questions about your daily oral hygiene routine.
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  A RealAge answered

  Tooth sensitivity is caused by the movement of fluid within tiny tubes located in the dentin, which is the layer of tissue beneath the hard enamel that contains the inner pulp of the tooth. This can irritate the tooth's nerve. When the hard enamel is worn down or gums have receded, these tiny tube surfaces can become exposed.
  
  Pain can result from eating or drinking hot or cold foods and beverages, touching your teeth, or exposing them to cold air. Taking a spoonful of ice cream, for example, can be a painful experience for people with sensitive teeth.
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  A Dr. William M. Litaker, DDS , Dentist, answered

  If your teeth are sensitive to cold, you should see your dentist. Your dentist can determine the source of your sensitivity. Cavities can cause sensitive teeth and are treated with fillings. New dental work can be sensitive for a period of time as the nerve heals. Roots exposed from receding gums can be sensitive. Your dentist may treat these areas of the teeth with desensitizing medicines and/or prescribe fluoride rinses. Teeth can also be sensitive from wear of the enamel due to bruxing or grinding the teeth. A bite guard can help stop this wear and resulting sensitivity.

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