Hello there! Thank you very much. :) Please refer to this previous post for nail maintenance. If that doesn’t answer your questions, feel free to shoot me another! Have a great day. - Mandie

*Edit: I have never used any nail-hardener products before. If your nails are brittle, try your best to keep them hydrated regularly so they don’t crack. I like to use cuticle oil, or even petroleum jelly. Also, if you have white spots on your nails, it could be a sign of low zinc/calcium, which in turn leads to soft nails (I am not a doctor - this conclusion is solely based on research on the Internet). I get my daily vitamins in the form of gummy, and I believe it helps promote nail growth as well as stronger nails. Again, just my opinion, but I believe it works. :) Good luck!