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If you are experiencing sensitivity to cold you may be suffering from a case of recession. Recession comes from brushing too hard against your gums. When you brush away your gum the actual root of your tooth is exposed. Roots are very porous, like a sponge, and will instantly absorb any temperature and shoot it directly to the nerve causing sensitivty. Your dentist will either fill these spots of recession or put medication over top to block some of the pores.
If the sensitivity in a particular tooth or teeth does not subside, after a result from any of these scenarios, a patient should consider replacing the fillings or consulting for a root canal. Always speak with your doctor for advice, and ask questions.