Polydactyl questions:

It normally doesn't hurt. I have a purrsonal theory that polydactyly (Is that a word??) is the evolution of opposable thumbs in cats.

Sometimes a tiny toe will grow between the main and side "paw". Care must be taken to clip this claw, or it will become ingrown. In my sole exception to be anti-declaw, sometimes it's best that this toe be amputated.

Of course, there are several more toenails to clip!