Fig. 6From: The Role of Enamel Proteins in Protecting Mature Human Enamel Against Acidic Environments: A Double Layer Force Spectroscopy StudyApproaching force curves for as received and deproteinated tooth enamel surfaces immersed in SAGF medium with pH 6.8 (a, b) and SAGF medium with pH 4.2 (c, d). Solid lines are best fits to the DVLO theory (see Table 2). Grey areas show schematically the Debye length calculated for SAGF mediaBack to article page