During the winter a lot of people have sensitive teeth for countless reasons, and a dentist will be able to examine your mouth and determine the cause of your pain; gum recession, grinding teeth, a loose filling, a cavity, an exposed nerve, etc.  They can also recommend a tailored treatment plan for this issue.
Tooth sensitivity is an unexpected pain or discomfort when consuming hot or cold food and drinks, or breathing cold air through your mouth.  It's the feeling when you get a short, sharp sensation in your teeth when anything cold hits your teeth or when you eat sweet or acidic foods and drinks.  Even brushing your teeth can cause sensitive teeth.  The range of discomfort can be mild or severe, coming and going, sometimes in all your teeth and at other times It's limited to a single tooth or area of your mouth.