2.3. Analysis of the Amount of Saliva and Its pH Value
The amount of saliva in patients before and after a dialysis session was assessed using the Schirmer tear test, according to a previous report [Salivary pH was measured using acid-base test strips (Toyo, Advantec, CT-NO20), which have 16 pH values as follows: 5.0, 5.2, 5.4, 5.6, 5.8, 6.0, 6.2, 6.4, 6.6, 6.8, 7.0, 7.2, 7.4, 7.6, 7.8, and 8.0 [