Www Masage Watcher.com Why Should You Masage Your Scalp With Your Fingertips And Not Your Nails !!??!?

Why Should You Masage your scalp with your fingertips and not your nails !!??!? - www masage watcher.com

I was told that it is healthy for your hair / scalp massage your scalp .. but does not seem to use, do the nails ...... But his fingers ............ Why is this problem ?....