Inclusion Criteria:  For Phase I: 8 subjects with xerostomia and 8 without that are 18 years old or older For Phase II: Subjects with xerostomia that are 18 years old or older  Exclusion Criteria:  For Phase I:  Children and adolescents (persons under 18 years of age) Persons with experience in the use of SaliPen  For Phase II: Subjects for them the study product is not indicated and/or do not agree to participate in Phase II. For the avoidance of doubt, the following conditions are exclusion criteria:  Persons with experience in the use of SaliPen Children and adolescents (persons under 18 years of age) Epileptic disorder  Persons that are allergic to the surface materials of the device  Electrodes: coated with gold Body: made of methyl vinyl silicone rubber Use of a pacemaker Pregnancy Psychiatric or psychological disorders Involuntary muscle movement disorder (such as Parkinson's) Neurologic disorder in head and neck area