A Anorexia nervosa and bulimia are included in eating disorders. A person with anorexia or bulimia worries if he or she is gaining weight. Usually, these disorders are found primarily in preadolescent and adolescent girls, but in certain cases, some children are also having these disorders. They admitted that these disorders have begun since they were in primary school. These disorders are affected by several factors, such as biological, social, psychological, and personality factors. This problem is getting bigger in our society and needs an early precaution to avoid further complication. Besides the physical appearance, oral clinical description of these disorders is clear enough, such as erosion on palatal surfaces of anterior teeth, erosion on occlusal surfaces of posterior teeth, and caries increase. The complexions of anorexia nervosa and bulimia are serious and need both medical and psychological therapy. The tooth and oral therapy that need to be given is topical fluoride and tooth conservation with materials that fit to the location of destruction. The deficiency on child's tooth, needs not only esthetics consideration but also physiological consideration. Dental material such as glass ionomer cement that release fluor can help remineralization process.