Vertical ridges on the nails — also considered as longitudinal striations — are raised lines that run from the cuticle to the tip of the nail. These ridges can vary in depth and number and are often more visible as we age.Nail strengthening treatment
For most people, these ridges are a normal part of aging. Just like skin removes elasticity and hair turns gray, nails also deal with structural changes over time. The production of keratin — the protein that forms nails — may slow down or become uneven, leading to changes in nail texture.