There is usually no direct relationship between finger lunulae and health, but there are some diseases that can cause color changes in finger lunulae, such as congestive heart failure, malignant tumors, and yellow nail syndrome. Structurally, finger crescents are part of the nail matrix, and the size of the nail half-moon is related to the growth rate of the nail. However, in terms of nutrition, the number of finger crescents is not directly related to an individual’s nutritional status and gastrointestinal digestive function. Therefore, there is no scientific basis for judging health based on the number and size of finger crescents. When the number, size and color of finger crescent teeth change dramatically within a short period of time, it is necessary to consider the possibility of other diseases, such as congestive heart failure can lead to red crescent teeth; malignant tumors can change the shape of the finger crescent teeth; the finger crescent teeth of the patients with yellow fingernail syndrome are inconspicuous and so on. If the crescent moon suddenly appears abnormal and is accompanied by other physical discomfort, it is recommended to consult a doctor in time for investigation.