Don’t panic! Those little white marks on your fingernails are almost always caused by a small zinc deficiency, taking daily vitamins usually help combat, and often even fix these. Just be aware, it will take at least two months for them to start getting better or going away all on their own, because of how slow the fingernails grow. Fun fact! did you know the nails on your good hand often grow faster than the nails on the hand you don’t use very often?