Ypur nail are keratin. The condition of yur nails will tell a doctor the condition of your health. My Doctor told me to buff my nails 3 times a day. I bought a revlon nail buffer and carried in my bag. I buffed and buffed for a long time. I was a nailbiter years ago. Now I can use my thumb nails as a screw driver. Buff-buff-buff ladies.The action brings blood to your nailbeds and feeds them.