SUMMARY The reported incidence of tooth erosion caused by acidic soft drinks has been increasingly documented. Citric and phosphoric acids are the two main dietary acids present in these soft drinks. Many variables need to be determined in order to assess risk factors for dental erosion caused by beverage consumption including pH, titratable acid- ity, pKa, buffering capacity, hence the aim of these in vitro investigations. Methodologies included pro- ®ling ̄at enamel and dentine samples (<