Salivary gland scintigraphy is used to assess the function of the major salivary glands of the head (parotid gland, submandibular gland). In cases of suspected Mb. Sjögren’s disease, salivary gland scintigraphy may be useful to confirm the diagnosis and to assess the severity of the disease. Furthermore, salivary gland scintigraphy is useful in the clarification of xerostomia, as well as before and after radiotherapy (external neck irradiation).