Q: What causes tooth sensitivity? A: Tooth sensitivity is tooth discomfort in one or more teeth that is triggered by hot, cold, sweet or sour foods and drinks, or even by breathing cold air. The pain can be sharp, sudden, and shoot deep into the nerve endings of your teeth. The sensitivity occurs when the underlying layer of your teeth (dentin) becomes exposed allowing stimuli (hot, cold, or sweet food) to travel through tiny channels (dentinal tubules) and reach the nerve in your tooth which results in the pain you feel. There are many factors that may lead to the development of tooth sensitivity including: • Recession of the gums • Clenching or Grinding of your teeth • Gum Disease • Tartar Control Toothpaste • Cracked Teeth • Whitening Toothpaste • Leaky Fillings • Brushing too hard • Abscessed Teeth • Sinus Infections Since there are many factors that can cause tooth sensitivity, see your dentist for an evaluation to determine what dental procedures or products are available to help you maintain a healthy and comfortable smile.