Powder manicures are safe when performed by a properly trained manicurist," said Dr. Joshua Zeichner, director of cosmetic and clinical research in the Department of Dermatology at The Mount Sinai Hospital. "In fact, they may be safer than traditional gel manicures that use you the light that can be harmful to the skin. I would be cautious with these manicures if you already have dry or brittle nails or suffer from conditions like psoriasis, which can cause thickening of the nails."
So, like with anything else, it's best to try in moderation. Go for dip powder nails every once in the while, but be sure give your nails a break sometimes, too!