Dental erosion means progressive, ireversible loss of hard teeth substance caused by acid action. Etiology of dental erosion is multifactorial and risk factors include extrinsic and intrinsic factors. Extrinsic causes taken (in organism) from the environment are most commonly associated with acidic beverages and food, medicines and oral hygiene products. Intrinsic causes of dental erosion are gastric acid, its return to the oral cavity by gastric reflux, vomiting in pregnancy or as part of eating disorders. Extrinsic factors lead to erosive changes on labial and incisical surfaces of incisors and canines, more often in upper jaw, while palatal and occlusal surfaces in all upper jaw teeth are the first to be affected in patients with primay endogenous source of acid. In the initial stage an erosion can be asymptomatic. Through extensive anamnesis of the health condition of each individual, his dietary habits and profesional environment it is possible to recognize the risk factors and how to influence them. With preventive and interceptive measures it is possible to remineralize initial lesions and to stop further progression. With progressive tooth wear the approach is restorative and prothetic treatment. This thesis shows a case of a patient with dental erosion after recuperating from anorexia and bulimia. Treatment with composite restorations stopped further tooth wear and aesthetic effect was achieved. Considering that dental erosion is increasing in the modern society and affects the younger population, the dentist has an important role in recognizing and preventing it.