Why do my fingernails turn under?

My finger nails used to be strong long healthy nails. Lately they have become brittle and now they turn under so I have to keep them clipped short. They have deep groves in them also.Why do my fingernails turn under?
Just as our eyes do, nails can tell a doctor a lot about the overall health of their patient. Curved nails are caused by:








Insufficient Vitamin B12


It can indicate Cardiopulmonary disease or asthma


It MAY indicate heart, liver or arsenic poisoningWhy do my fingernails turn under?
You take more calcium.

make up