Fig. 3

Set-up for standardized brushing after exposure to lactic acid. a – weight block (200 g) with lateral guide bar (not reaching the ground). b – brushing chamber. c – toothbrush (Curaprox Supersoft, Curaden, Dietikon, Switzerland. d – fulcrum of the toothbrush. e – tube with artificial dentin fluid. f –dentin sample in the chamber base