are two major reasons for hypersensitivity of teeth.
First, as one becomes of middle or of elderly age, one's alveolar bone
level that embraces the root of the teeth recesses. In this process the
exposure of the root of the teeth makes him or her hypersensitive to outer
hypersensitivity is one of the symptoms of periodontal diseases in which
the destruction of the alveolar bone progresses rapidly. When there is no
bleeding in the gums or any dental calculus seen in the naked eyes, there
can be some wedge-shaped grooves caused by inappropriate brushing in the
exposed root of teeth, which are also the cause of hypersensitivity for
anyone regardless of age.
Second, decayed teeth can be one reason. As tooth decay progresses, walls
to the pulp in the middle of the tooth are getting thinner. That process
makes the tooth more sensitive to both hot and cold stimulants. Moreover,
in the case of tooth decay, food intake alone can cause hypersensitivity