I'm slightly obsessive about this, having posted my own 'please help my nails fall to bits' thread back in may...
I now have glorious nails - the year 10 girls at school even comment on them "are they real miss?"! I could never wear polish unless I fancied a six week wait each time for them to grow back and then it would involve whole sheets of nail lifting off - they were awful!
Then I read (on here) about mavala scientific nail hardener, but even so didn't buy it for about 4 months because the bottle is small and funds were tight, ironically I probably wasted way more than it costs (around £6) on all sorts of other stuff!
It has TRANSFORMED my nails - I'm constantly having to file them short! (a new, exciting experience). I wear polish! And take it off again! And wear another colour! All things I could never have imagined before :D
Basically it's a tiny blue bottle of glory, which ive been using at least weekly since July and which looks as though it hasn't even been used - it is literally going to last forever I think!
I also bought some Leighton Denny polish remover from amazon which is said to be kind to nails.
And as a total new can I recommend Essie polishes- oh my goodness they're a revelation!
Ok, sermon over, good luck!
Oh, one ps - Sally Hanson topcoat, in the orange bottle (not that Essie polishes NEED a topcoat mind you!)