When people get white spots on the fingernail, is this a calcium deposit?

White spots on the nails have usually been associated with
calcium deposits or a deficiency of calcium. This is not the correct cause for these. In
a majority of cases these marks are the result of injuries to the nail bed. The injuries
take a long time to show up as marks on the nails and people usually forget that they
had been hurt. The minor injuries could be something like the fingernail being squeezed
below a heavy bag, injuries during a manicure or the alike. In a minority of cases the
white marks are a result of zinc deficiency or infections.