Bx is a new 38 revolutionary two part system that acts as a protective shield for the natural nail under any gel polish coating and can also be used as a natural nail strengthening system to grow natural nails more readily on their own ibx is the first system of it39s kindthis penetrative toughening system works inside the nailinstead of top is cured with led light and forms an interpenetrating polymer network that fuses the upper layers of the nail together the result is a tougher