Re: why do i have ridges in my thumb nails
It depends on your genetics, but mostly what you are seeing is age related. As we age, the nail bed does not supply the nail plate with the same amount of oils and moisture and the nailplate becomes dried out to a certain extent. The ridges are actually the 'rails and grooves' upon which the nail plate rides forward on the nail bed. The rails are on the surface of the nail bed and the grooves are on the underside of the nail plate. These will never 'go away' but you can make them less prominent by applying a good quality nail and cuticle oil at least twice daily. Try Botanical Oil which is available in the nail department of Sally Beauty Supply.
Also, the nail plate can become dried out if you work with a lot of textiles (paper, fabric, etc.) or use strong solvents (household cleaning solutions) without wearing gloves.