How can I split a mesh? I'm making a dog head and am trying to seperate where the mouth goes but can't figure it out. The entire head is solid. The part still needs to be connected to the head.
What you want is the rip tool: Select the edge loop, press V, select one of the parts with L, if you move it you can see it is now a separate mesh (but still part of the same object, to make a new object with this part, press P).