My nails have recently started to peel and split - on two fingers on one hand, the other hand is fine. There is a vertical line which has split the nail, so have cut it right back, but also is flaky - I've been using the Sally Hansen nail treatment for the last few weeks, but it doesn't seem to be working. I read with interest the thread about flaky nails - does anyone think that it is a defiency in some vitamin? And is it possible to overbuff your nails?