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The results also showed that fingernails now grow by 3.47mm every month â almost twice as fast as toenails. The nails of younger people and men grow faster. The little finger nail grows much more slowly than other fingernails, at a rate of 3.08mm each month. The middle finger has the fastest-growing nail.
1 A fingernail will take half a year to grow back if you lose one because of an injury. If you lose a toenail, it might take a year and a half to grow back!  Fingernails grow faster on your larger fingers and on your right hand if you're right-handed, and your left hand if you're left-handed.