The nerves in a tooth are located in the pulp, which is the bundle of nerves attached to the blood vessel in the center of the tooth. Dental neuralgia is divided into two categories: Pulp Sensitivity: If your pain is centered on one tooth, the problem may be related to the pulp. Causes of dental neuralgia include broken, chipped, or cracked teeth; cavities or infections; recent fillings; and stress from clenching or grinding. Dentin hypersensitivity: dentin hypersensitivity refers to neuralgia in the teeth and is relatively common. This type of dental neuralgia occurs when the enamel is damaged or eroded and external stimuli, such as heat, cold, and acid, reach the nerve endings in the dentin layer of the tooth. Causes of dentin sensitivity include the use of tooth whitening products, receding gums, and untreated tooth decay. Excessive brushing and recent gum surgery that exposed the tooth roots can also cause tooth pain.