Cause it doesn't hurt, when your toenails fall it's because the zone is ready to let the nail go, it's already healed. The pain comes way before losing the nail, weeks I would say. By the time the nail falls on its own is because the zone already started growing a healthy nail under the bad one and the rest of the finger has healed so it won't get infected. But if you try to take the fingernail out before the zone healed, now that would hurt like a bitch. The body cells know what they're doing, we should always let them work.

People People toenails don't just fall sometimes, if your toenails fall go see a doctor (⊙…⊙ ) ... how is he not in pain!!??