I'm with Nightwalker on this one. Regardless of how many teeth he had, it was the desperation to get the ring which gave Gollum the ability to get the finger off. And sharpening stones make things sharp for cutting and slicing, whereas to get through bone you need an edge and a bit of force (like a cleaver). Gollum certainly had a strength greater than his small frame suggested. The existence of the stone is well remembered but beside the point.
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