I'm very new to Blender but I'm trying to create a simple facemask. I am using a Head Mesh (using FaceBuilder add-on) and a simple hallow cylinder to create the profile of the mask that will sit against the face. I have intersected the cylinder with the face and have used the Boolean Modifier with the Difference Operation to create a cut in the cylinder using the Face mesh. The problem that I am having is that the front of the face is remaining after doing the Boolean Modifier. Is there any way of removing this? Maybe I am misunderstanding/misusing the Boolean Modifier.