From about the age of 13 to 15 I bit my nails badly (raging hormones??), then applied the nasty bitter-tasting stuff to them, and stopped abruptly.Nails have been good and strong ever since.Side note: The nails on my right hand grow faster than on my left, Toenails grow equally on each foot. That may be too much information Anyway, as a mostly righty, I'd prefer the left hand nails to grow fastest as that's my opening hand. What to do