When you use your fingers and toes the nails naturally wear down. This is what they are for. So long nails were not such a big problem when most people did manual labor. But if you get long nails you can use knives to cut them. They had these back in the stone ages. There are also files used for filing down the nails, which were also available in the stone age. You can also tear off parts of your nail using the nail on your other finger, typically a thumb. Other ways of trimming your nails is to use your teeth.
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