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its not the silicone i'm worried about, its the rest of the body
take your hand and start chopping a watermelon, unless you're a karate champ or whatever its gonna hurt
now imagine that besides muscle and sinue, you got this piece of jiggly silicone in between your skin and the bones, which, as far as i know, does not bond with living tissue, so its going to want to move around... causing some damage along the way.