The absence of a crescent on the nail does not mean that the body is unhealthy. Newly grown nails are white, and then they slowly become transparent, with transparent nails coming through as a light pink. Therefore, the whiter the crescent is actually the newer the nail. In general, a person’s thumb usually has a crescent because it is highly used, wears out quickly, and grows faster. The little finger is less active and grows slower, so many people do not have a lunula on their little finger. The size and number of crescents in most people’s fingers are the result of individual differences, and there is no such thing as “healthy fingers with more crescents”. If the shape of the crescent changes significantly in a short period of time, such as becoming larger or smaller, or disappearing and then reappearing, you should be alerted to thyroid problems. In addition, poor nutrition and gradual ageing can slow down the metabolism, which can also make the crescent finger become less or even disappear.