A few possibilities: Fracture, new cavity, gum recession. A fractured tooth will be sensitive when chewing directly on it. Almost all possibilities require dental treatment and vary tremendously. Go see a dentist concerning this problem.
Answered 6/2/2013
5.1k views
Other possibilities: Cavities aren't the only causes of tooth sensitivity. Gingival recession can lead to part of the tooth being exposed and becoming sensitive. Also defects in fillings and cracks in teeth may cause sensitive areas. The gums themselves may also be a cause of sensitivity.
Answered 6/2/2013
5.1k views
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A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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