The damaged pulp must be cleaned out and the empty root canal filled with a passive material that preserves the integrity of the gum and does not allow infection. The procedure is normally completed in a single office visit under local anesthesia. If you experience pain or a mild tingly feeling when you bite into sweet or sour foods, or drink hot or cold beverages, you could have sensitive teeth. Sensitive teeth are usually caused by receding gums and exposed root surfaces, fractured or chipped teeth, or clenching or grinding your teeth. Clenching or grinding teeth wears away enamel surfaces, causing pain and loosening teeth.
Many people grind while sleeping and wake up with dull headaches or sore jaws.
Another sign is a dark edge on the top of your lower front teeth, which is actually the exposed underlying dentin. People often grind their teeth because of stress, a sleep disorder, an abnormal bite, or crooked or missing teeth. If stress is a problem for you, find ways to relax, get counseling, or take muscle relaxants. Have your dentist fix your abnormal bite or your crooked or missing teeth. Wear a plastic mouth guard, fitted by your dentist, while you sleep.