Objectives: To determine the effect of toothpaste concentration on enamel and dentine wear in vitro and to model the effects of toothpaste abrasion upon dilution during toothbrushing in vivo.
Methods: Polished human enamel/dentine specimens were indented with a Knoop diamond and the enamel-dentine junction profiled. Specimens were brushed for 1200s with toothpastes with differing relative dentine abrasivity (RDA), either Toothpaste A (RDA=90) or Toothpaste B (RDA=200), using a toothbrush mounted in a brushing machine.