hi sirs. i have an human arm, i have to do some emersion of metal liquid from the skin? someone have some guidelines?

happy of that.
and please sorry me for my bad english

you are right man!

tell me if this is clear. you have the head in one geometry (aka one transform node) and every tooth in a single separated geometry.

you have done the blend shape for the head modifiyng the vertex...

that's not a problem.
go to the input connection and change the position of the blendshape node.. take it behind the skinning node.