The disappearance of the white moon can be made up. The disappearance of the white of the moon may be related to vitamin deficiency, malnutrition, anemia, and can be gradually replenished through supplementation or symptomatic treatment. The white moon, medically called the nail arc shadow, belongs to the growth area of the nail and is related to the degree of bonding between the nail and the nail bed. If the bond is looser, the crescent white will appear. The loss of the crescent white may be due to pathological factors, such as calcium deficiency, which can easily affect the development of the nail and lead to the loss of the crescent white. Generally, calcium can be supplemented by taking calcium gluconate or calcium carbonate chewable tablets to make up for the loss of white moon. In addition, the disappearance of lunar whites may be due to physiological factors, such as the relatively large area of lunar whites in young people; older people have smaller lunar whites, or even none. By supplementing nutrition, eating a balanced diet, eating more food with protein, such as eggs, lean meat, milk, etc., keeping a happy mood, and ensuring sleep time and sleep quality, you can also make up for the lunar whites. If there is a lack of lunar white, you can first go to the hospital for a trace element test or a serum electrolyte test. If the examination reveals that it is not caused by disease, no treatment is needed and there is no need to worry too much.