 Blood about 2 tablespoons will be drawn for routine blood tests. Your complete medical history will be recorded. You will have a physical exam, including measurement of your vital signs blood pressure, heart rate, temperature, and breathing rate, weight, and height. You will have a dental exam. You will complete a questionnaire that asks questions about dry mouth. In addition, you will be asked questions about your diet and eating habits. This should take no longer than 10 minutes. Also, saliva will be collected by a simple, in-office oral test that measures saliva flow rate over a 5 minute period. Women who are able to have children must have a negative blood about 1-2 teaspoons pregnancy test. 