The aim of this study is to bring a discussion about dental erosion in marathon athletes. To be able to explore the prevalence of dental erosion and its characteristics. In addition, analyzing the athletes diet and their routine in dealing with erosion, suggesting actions adopted by dentists in the practice of neutralizing dental erosion and providing guidance to patients who are marathon athletes. The methodology that was used in this study was a narrative literature review. It is evident that athletes are often considered to be highly healthy beings, however, when their oral health is analyzed it is considered to be downfalling. For athletes to perform perfectly well in their activities, in addition to their physical health, there needs to be routine monitoring with a multidisciplinary team, which should include a dentist specialized in Sports Dentistry. This way, complications and dental pain will not interfere with their running performance. When starting a race, it is essential to stay hydrated, and sports drinks are capable of replacing salts and body fluids that were eliminated through sweat, in addition to promoting muscular energy. Dental erosion is diagnosed when the surface of the tooth suffers frequent and prolonged exposure to acidic elements such as citrus fruits, reflux, coffee, soft drinks and sports drinks. Isotonic drinks have an average hydrogen potential (pH) of 2, becoming highly erosive to the tooth enamel. It has yet not been found in research a way to replace the isotonic drink with another, less acetic sports drink. It is necessary for the dentist to have an understanding about the pathology to be able to act with preventive measures, treatment methods and a diagnosis. Patients who are athletes must be aware and willing to be a good collaborator so that together with the dental professional they can complete the treatment with success.