Dentin hypersensitivity is simply defi ned as a short sharply painful reaction of the exposed and innervated pulp-dentin complex in response to stimuli being typically thermal, evaporative, tactile, osmotic, or chemical and which reaction cannot be attributed to any dental defect or pathology. To be hypersensitive, dentin must be exposed and the exposed tubules must be open and patent to both the oral cavity and the pulp. Exposure of dentin through the loss of gingival and periodontal tissue may be caused by either too meticulous or by neglected oral hygiene. Exposure of dentin by the loss of the protecting enamel is mainly caused by erosion, abrasion, and abfraction or a combination thereof. Clinical examination for dentin hypersensitivity would include a pain provocation test by a tactile stimulus, an evaporative air stimulus, or a cold stimulus. A number of other dental conditions can give rise to pain symptoms, which may mimic those of dentin