What Does 'Saw'-Filing Fingernails Do?

Question

Why is it often advised not to file fingernails in a 'saw' motion and to file them in the one direction? What problems, if any, does it cause?

Thanks. :-)

Answer 1

It makes them brake easily and also flake.

Answer 2

Hiya, if you saw at your nails you will weaken them, which will cause them to snap or split.

Answer 3

if you saw you split

Answer 4

it does less damage to you nail that way