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Are your teeth sensitive to cold or hot temperatures? You're not alone. Tooth hypersensitivity affects more than 45 million Americans, 10 million of those chronically.
Tooth sensitivity isn't itself a reason to find a dentist immediately, though it may be a warning sign that you are causing unnecessary hardship to your gums. The pain itself is most often caused by a receding of your gum line, which is often related to brushing too hard (2 out of 3 Americans brush too hard) or using a brush with hard bristles.
To avoid receding gum lines and the discomfort associated with them, don't brush as hard as you do now and switch to a toothbrush with softer bristles. Of course, there are other factors which can cause gum lines to recede, so consult your dentist with any further questions.