Measuring conditions
moistness, dry mouth
DRY MOUTH
The five measurement conditions were: (1) control, storage in water only and no test sample applied; (2) NP coating; (3) PK coating; (4) BT coating; and (5) DW coating. The order by which the five conditions were measured was determined using the Latin square design. The study participants were instructed to rinse before the start of the measurements and sit during the measurements. The measurements started at 16:00. In all cases, oral moistness was measured with an oral moisture meter (Mucus®; LIFE, Saitama, Japan) prior to the measurements to ensure that there was no dry mouth.