Evaporative (air) sensitivity will be assessed by the participant's response to an evaporative (air) stimulus administered by the clinical examiner. Participant response will be evaluated immediately following application of the stimulus using the Schiff sensitivity scale (0=Participant does not respond to air stimulation, 1=Participant responds to air stimulus but does not request discontinuation of stimulus, 2=Participant responds to air stimulus and requests discontinuation or moves from stimulus, 3=Participant responds to stimulus, considers stimulus to be painful, and requests discontinuation of stimulus). A decrease in Schiff sensitivity score indicates improvement. Schiff sensitivity score = mean score of the two 'Test Teeth' (selected at Baseline). Change from Baseline is calculated for each 'Test Tooth' first before calculating mean change for the two 'Test Teeth', where change from Baseline = Week 8 score minus Baseline score.

Tactile sensitivity will be assessed by the participant's response to a tactile stimulus administered by the clinical examiner using a constant pressure probe (Yeaple probe). After each application of the stimulus, the participant will be asked to indicate whether they experienced any pain or discomfort (yes/no response). The pressure setting with two consecutive 'yes' responses will be recorded as the tactile threshold in g. At Baseline, upper force setting will be 20g; at Week 8, upper force setting will be 80g. An increase in tactile threshold (g) indicates improvement. Tactile threshold (g) = mean value for the two 'Test Teeth'. Change from Baseline is calculated for each 'Test Tooth' first before calculating mean change for the two 'Test Teeth', where change from Baseline in tactile threshold (g) at Week 8 = Week 8 value minus Baseline value.