Tooth sensitivity is a nerve irritation that occurs after your enamel has worn down due to your gums receding, exposing the surfaces of your teeth. Pain normally occurs from consuming hot or cold foods and beverages that touch your teeth, brushing teeth in incorrect ways, or simply breathing through the mouth.
The most common complaint from dental patients is that tooth sensitivity causes so much pain that eating habits change. Even a spoonful of ice cream can be an excruciating experience for people with sensitive teeth.