Tooth sensitivity is a common symptom characterized by a sharp, sudden pain when eating or drinking something hot, cold, sweet, or acidic. It can also be triggered by breathing in cold air. It usually develops over time as the enamel on the teeth wears away, exposing the dentin layer and causing pain when the nerves in the teeth are stimulated. Symptoms can vary from mild to severe, and can manifest as sharp, shooting pain or a dull ache.