If your nails are flaking or splitting, you have damaged nails. These are most commonly caused by severe dehydration but can also be caused by a heavy object dropping on your toes nails. Physical damage to your toenail may cause it to be thick until the damaged area grows out. This is why thickening of the big toenails is common in young men. Old people also often have thickened, hard toenails, probably because of the damage they have sustained over the years, and because their nails grow more slowly, it takes longer to repair the damage.
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