The bad thing is not the material itself, which many people can't accept. When another substance is sent into the body, there will be some rejection, rupture or yellow water, so some adverse reactions may occur in these cases, but it will not cause cancer. Prosthetic materials will not produce exactly the same adverse reactions according to the silica gel or pot degree of the materials used.
So in any case, we can't say whether a material is good or bad, we can only say what advantages this material wants to use and what disadvantages it wants to avoid.