This in situ study aims to investigate * the protective potential of milk and fluoridated milk on erosive wear of enamel * the protective potential of milk and fluoridated milk on erosive wear of dentin * to compare to protective potential of milk and fluoridated milk with products containing casein phosphopeptide-amorphous calcium phosphate * to compare the protective potential of milk and fluoridated milk with a fluoridated toothpaste or stannous-chloride containing fluoride solution (SnCl2/AmF/NaF)
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Substance loss (profilometry)
Timeframe: after each study phase (5 days)