It can be defined as a painful reaction in one or more teeth triggered by hot, cold, sweet or sour foods and drinks. sometimes even air or rinsing with tap water during winter can trigger this.This pain can be sharp, sudden and shoot deep into the nerve endings of your teeth.
Apart from a cavity or a missing filling, the most common cause of tooth sensitivity is exposed dentin (inner surface of tooth) on the roots of your teeth. Normally, the dentin (the second, more sensitive layer of the tooth) is surrounded and protected by your enamel, cementum (special root covering) and gums. The cause or mechanism of dental sensitivity is still not well understood. It is believed that the little tubes that connect the dentin to the nerve or pulp serve as sensory conductors. That sensation may be one of pain.OUCH!!!