Assessment of surface roughness
tooth
EROSION
Profilometry using linear scanning stylus; MarSurf PS 10 (Mahr GmbH, Gӧttingen, Germany) ISO 16610–21, Lt = 1.5 mm (0.25 × 5), parameters Ra and Rz was used for this purpose. Twelve teeth from each group were assessed for their surface roughness at baseline and then post erosion. Teeth were firstly polished using 1200-grit abrasive sandpaper to smoothen out any irregularities on the enamel surface. Then, they were stored in artificial saliva for 1 h. For each tooth, three measurements were taken, and an average reading for those three measurements was obtained.