Tooth sensitivity is a common condition. It can include being sensitive to temperature changes, sweets, biting, or even when brushing. Sensitivity can often occur when your gums have slightly receded, exposing the root surface. This allows food and liquids easier access to the underlying dentin and sensitive nerve. This type of sensitivity can be managed by altering your brushing technique by using desensitizing toothpaste. Fluoride rinses and professionally applied fluoride varnish can also provide relief.
However, if tooth sensitivity continues, you should been seen by the dentist for an evaluation to determine the extent of the problem. Persistent sensitivity, especially to hot and cold or sweets can be an indication of a cavity or infection that requires immediate attention to relieve the pain.