Smooth, lustrous nails are a sign of health and beauty in our society and fuel the US$6-billion nail salon industry in the United States. Although many women can use nail cosmetics without adverse consequences, when problems occur it is important to recognize the causes and treat the problem condition. The cornerstone of management of nail cosmetic problems is prevention through education. In spite of efforts to that end, nail salon procedures and materials can cause nail disease that must be recognized and treated in order to restore the nails to health.