I want to put a plug in for Flexinails. I have had recurring issues with nail breakage and splitting over the past year since I took up classical playing again after a long hiatus. I had been looking for something to make my nails stronger, and even considered using a nail hardener product which goes on like nail polish. Fake nails are an absolutely impossible option as that process ruins the natural nails and cuticles, and should be avoided at all costs. So I bought four bottles of Flexinail from their website almost 3 months ago and have used it as directed, applying twice per day and leaving on for 30 minutes. They claim that the solution is able to penetrate the nail and fortifies the nail matrix to encourage the growth of strong healthy nails. So, after 3 months, my nails are the strongest an healthiest I can ever remember them being. Supposedly, they are claimed to become more flexible, although I have not experienced that effect, but they are strong and visibly thicker. It is also claimed that with continued use your nails become stronger as the nail grows out. Although this stuff is not cheap, it works as claimed and I find the results to be well worth the price. You also have to be patient with this stuff, and use it as directed. I only recently started to see the results and I even broke a nail about a month into it, which made me wonder if the stuff was really all that good, but I'm glad I stuck with the program. My nails look and feel great now and they sound even better.