Each participant will have a slip stating times at which their saliva samples (1.0 ml) will be collected. After each sample collection, the time interval will be ticked off on the slip. Participants will be waiting in the waiting room and will be instructed to refrain from eating or drinking during the length of their appointment. Saliva samples will be collected by the lead investigator (M. Albahrani) 6 times at the following time intervals: 0,1, 15, 30, 60 and 90 minutes.