Healthy people's nails are rectangular or square. They are about 1/2 of the length of the first knuckles. They are translucent and pale pink. They have no other colors or spots, dots and bands. Their color is even and the top is very fine. Parallel longitudinal lines, the nail surface is not cracked, the nail edges are neat, and there are no changes such as protrusions, depressions or defects. The back of the deck and the armor are tightly bonded, without separation and change, and the sides are connected to the ditch. At 1/5 below the nail, there is a white curved half moon mark.
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