Get a shit ton of lye, chop it up in small pieces (a hacksaw works best), dump all of the parts in a tub, dump the lye in there, wait for 2 or 3 days. Get some thick plastic gloves up to your elbow, start gathering the teeth an pieces of bone from the bottom. The rest, scoop and into the toilet. Flush, a few times after every drop. Scatter tge oieces of bone and teeth in a river.

Or you could just watch Breaking Bad.