People with eating disorders suffer from a mental disorder that negatively affects their physical and/or mental health. The three most frequent eating disorders are binge eating disorder, bulimia nervosa, and anorexia nervosa. Environmental and genetic factors are involved in the pathogenesis of eating disorders in vulnerable persons. Although treatment varies among different types of eating disorders, nutrition, medical care combined with psychotherapy and medications are standard of care. The aim of this review is to give an overview of the oral health impact of eating disorders with a special emphasis on the periodontium. Oral health professionals have a unique role to play in the early diagnosis of eating disorders because of the important impact that eating disorders have on the oral cavity. In vomiting-associated eating disorders, the risk of erosive tooth wear is mainly localized to the palatal surfaces of the incisors. Emerging evidence also indicates a high frequency of gingivitis and gingival recessions associated with compulsive toothbrushing. A holistic approach, including oral health and functional rehabilitation, should be promoted by physicians, psychiatrists, and dentists for people with eating disorders.