Because I believe nails are just as important as your outfit or hairdo I paint them every week (also never forget your toes especially when you show them!!)
One of my best friends has her own beauty salon and she introduced me with OPI a few years ago. And since then I have been true to this brand.
As you can see I use the bubble bath colour the most.
Before painting my nails I always file them in a round shape. I believe a round shape helps to not break my nails as fast as when in a square shape. I also always use a glass file, I was told this also helps to prevent your nails from breaking. This file also last very long!