Allah, may He be glorified, has created our nails with total perfection. Look at your nails right now and see the signs of Allah in them. If the nails were hard as the bones, then they would damage our skin when we scratch. At the same time, the nails are not so soft that we can’t get rid of the itchy feeling when we scratch. Allah has made the nail in such a way that it doesn’t damage our skin when we scratch and at the same time made it hard enough to get rid of the itchy feeling. Subhan Allah!
source : www.islamcan.com