Several questionnaires have been proposed to identify patients with xerostomia and hyposalivation. Fox et al developed a questionnaire on the severity of dry mouth, which may predict true hyposalivation (Table 1).21 A positive answer to all the questions was associated with low saliva flow rates. A few years later, Thomson et al created an eleven-item summated rating scale on the severity of chronic xerostomia (Xerostomia Inventory).22 Each response was scored and summed to give a final score. van der Putten et al shortened the Xerostomia Inventory and proposed the Summated Xerostomia Inventory-Dutch. Only five items were included.2 In the questionnaire developed by Sreebny and Valdini, the question “does your mouth usually feel dry” was found to have had a sensitivity of 93%, a specificity of 68%, a negative predictive value of 98%, and a positive predictive value of 54% for hyposalivation.23 Eisbruch et al studied the grade of xerostomia through a validated scale made of three grades (Table 1).24 Finally, Pai et al proposed an eight-item visual analogue scale with which patients were asked to score their xerostomia.