of cut at an average of 1 millimetre per 100,000 brush strokes onto dentine. This comparison generates abrasive values for the dentifrices that would be safe for daily use. Since 1998, the RDA value is set by the standards DIN EN ISO 11609. Currently, the claim on products such as toothpaste are not regulated by law, however a dentifrice is required to have a level lower than 250 to be considered safe and before being given the ADA seal of approval. The vast majority of toothpastes commercially available have RDA values of 250 or less and are unlikely to have a significant impact on abrasion of tooth structure over a lifetime of use. On average, data suggests less than 400 μm of tooth wear occurs over a lifetime using toothpastes of RDA 250 or less. The RDA score of a toothpaste is not the primary factor to consider when managing and preventing dental abrasion. Other factors such as the amount of pressure used whilst brushing, the type, thickness and dispersion of bristle in the toothbrush and the time spent brushing are significant factors that contribute to the risk of dental abrasion. Treatment There are several reasons to treat abrasion lesion(s) (also known as ‘Class V cavity’) such as: Sensitivity. Presence of carious lesion. Aesthetically unpleasant. Arresting the progression of the lesion. Reducing potential onset of caries or periodontal disease as these lesions can present as a plaque retention factor. Where there is a risk of pulpal exposure if lesion depth is severe enough. When retention of a removable appliance is interfered, i.e. denture To improve denture clasp(s) retention. Overall integrity of tooth structure is compromised. In order for successful treatment of abrasion to occur, the aetiology first needs to be identified. The most accurate way of doing so is completing a thorough medical, dental, social and diet history. All aspects need to be investigated as in many cases the cause of abrasion can be multi-factorial. Once a definitive diagnosis is completed the appropriate treatment can commence. Treatment for abrasion can present in varying difficulties depending on the current degree or progress caused by the abrasion. Abrasion often presents in conjunction with other dental conditions such as attrition, decay and erosion. Evidence suggest there is a decrease in the effect of dental abrasion with dental erosion when fluoride varnish is applied onto teeth. Successful treatment focuses on the prevention and progression