If You Have White Marks On Your Fingernails, Read This!
White spots on your nails is  very common, everyone at some point in their lives will get them. These spots can indicate a few different things, because the different patterns of white spots may be symptomatic of different causative conditions, but the underlying theme is that your body is trying to tell you that you are not healthy. It’s essential to know the causes and take respective measures to treat them.
Don’t worry, you aren’t going to die,  One of the most common causes for these little white spots, which can show up on both fingernails and toenails, is a condition called leukonychia , Some say leukonychia is a sign of excess or deficiency of calcium, zinc, or other vitamins in the diet, while others say it isn’t.
There is a ton of info and a lot of links for further reading and studies that have been carried out. Either way, I think it’s cool that something so small could have such a scary medical name.