(1) Air-blast
Air was delivered from a standard dental unit air syringe at a distance of approximate 1 cm for 5 s at an operating temperature of 23 °C (±4 °C), directed at the exposed buccal surface of the hypersensitive tooth. The Schiff sensitivity score was used to assess the subject’s response to this stimulus, as follows0 = Subject did not respond to air stimulus1 = Subject responded to air stimulus but did not request discontinuation of stimulus2 = Subject responded to air stimulus and requested discontinuation or moved away from stimulus3 = Subject responded to air stimulus, considered stimulus to be painful, and requested discontinuation of the stimulus.