Participants will have a complete medical and dental history. Saliva samples will be collected from the major salivary glands, which are located in the cheeks and under the tongue. Several blood samples will also be drawn for tests. Some participants will have a biopsy of the minor salivary glands, usually from inside the lower lip, to confirm or rule out the diagnosis of Sj(SqrRoot)(Delta)gren s syndrome and to determine the extent of changes in the salivary glands. An eye examination including a standard eye examination and a dry eye assessment is done. The ability to taste and smell may also be evaluated, and participants may have an ultrasound examination of their swallowing function.