If you have dental sensitivity, you may experience severe pain or discomfort while engaging in certain activities, such as consuming hot or cold foods or beverages. Tooth sensitivity occurs when the enamel that protects your teeth is weakened, causing the inner dentin layer to become exposed. Your dentist will be able to figure out why your teeth hurt and give you the right treatment to stop any more damage. Making sure to brush your teeth twice a day with a soft-bristled toothbrush, as well as flossing daily and using fluoride toothpaste, can help reduce the pain associated with sensitive teeth.