It may happen that certain minor marks appear on the nails. As a nail technician, it is important to know how to identify them before any service. But what are they due to and where do they come from? Keep reading, the nail supply expert Maryton will give you ideas in this article. Lines on the nail: ridged nails are generally the result of aging due to keratin, which retains water less well at the origin of a smooth nail. It can also be a sign of iron and vitamin deficiencies. White spots under the nail: the small white spots that we see appear…