Have bitten my nails my whole life and am (for the hundredth time) attempting to grow them. Am 10 days in and doing really well but I've never got past 2 or 3 weeks before, mainly because my nails are so soft (imagine a newborn baby's nails) and so as soon as they start to grow they flake and tear. Am using a normal nail varnish type hardener on them daily but what else can I use/take/eat/do to strengthen them?