Today's clue ladder, gentlest first. In the game each rung is worth fewer points, so open only what you need — the answer stays hidden until you ask for it.
I carry thousands of teeth on a hidden ribbon inside me, filing each meal one scrape at a time.
I am small and soft, and I move so slowly my name has become a byword for it.
I travel on a single muscular foot and leave a glistening silver trail behind me.
I haul my whole house on my back and never once rush to get anywhere.
I appear on garden lettuce after rain, shell on my back, the gardener's least welcome guest.
5 letters, starts with “S”.