Dentine surface loss after 10 erosive cycles and removal of degraded collagen for the groups without salivary pellicle (NP).
Different letters denote significant differences between the experimental groups. ** Denotes significant difference between Negative control and NaF groups, for the pair comparison for the factor presence of fluoride. * Denotes significant effect of adding fluoride to the plant extracts, for the pair comparison for the factor presence of fluoride.