A missing crescent is the disappearance or decrease in size of the half-moon at the root of the nail. It is mainly because of the lack of micronutrients in the growth process of the nail does not have enough micronutrients to participate in the formation of the nail half-moon or the nail half-moon volume is too small by the nail small skin cover, from the appearance of the crescent moon can not be seen. May also be caused by a lack of vitamins, need to go to the local hospital to do trace element testing, found the lack of trace elements targeted supplementation can be, when the body’s minerals and vitamins to be supplemented, the nail half moon disappears or shrinkage of the symptoms will gradually recover, the cycle of treatment is relatively slow, it takes 2-3 months to achieve the desired results. Do not be picky in your diet, you can take balanced nutrients from food.