The crescent, the white part at the root of the nail, is commonly known as the “Circle of Health”, and it is normal for it to disappear without any other abnormalities or discomforts. 1. The crescent is actually the newborn keratin at the root of the nail, which is called the crescent because its upper part is curved and its shape is similar to that of a crescent moon. There are obvious individual differences in the number and amount of crescent teeth, which are not directly related to health, and it is normal for them to disappear without any other abnormalities or discomforts. 2. The number of crescent teeth is also related to the growth rate of nails, for some people with faster metabolism, the area of crescent teeth will be larger and more, such as adolescents, children and so on. For people with a slower metabolic rate, the crescent area will be small and the number of crescents will be small, or even disappear gradually. If the number of crescent teeth decreases or disappears, there is no need to worry too much. If necessary, we can ask the doctor to consult us and analyze the situation together with other clinical manifestations.