It will be included in the sample a total of 60 patients undergoing hematopoietic stem cell transplantation (THSC) at the Clinical Hospital. Patients will be randomly divided into four groups, each with 15 subjects: group I patients who will use only the mechanical sialogogue; group II patients who will make use of electrical sialogogue (TENS); group III patients who will make use of mechanical sialogogue associated with TENS and group IV patients who will not receive therapy (control).