Tooth sensitivity is a common dental issue characterized by discomfort or pain in response to certain stimuli, such as hot, cold, sweet, or acidic foods and drinks. This sensitivity occurs when the protective enamel on teeth wears down, exposing the underlying dentin, which contains tiny nerve endings. Several factors can contribute to tooth sensitivity, including gum recession, tooth decay, and aggressive brushing techniques. People with sensitive teeth may experience sharp pain that can be temporary or persistent, making it important to consult a dentist for proper diagnosis and treatment options.