Hello, I have black Edges and Vertex when smooth.

Hello, I’m new in Blender (sorry for my english)

I try to smooth the face I created according to this:
http://www.secondpicture.com/tutorials/3d/3d_modeling_of_a_human_head_3ds_max_01.html

but when I smooth it’s look like this:

http://rotter.name/User_files/nor/graphics/5082b95c2d483cbc.jpg

You can see the black Vertexes and the Edges.

I don’t this there is double beacause I tried to zoom and I cant see anything and it’s look fine.

http://rotter.name/User_files/nor/graphics/5082f6377e122c7f.jpg

what is the problem? can I fix it in an easy way?

Thank You!

Select all vertices and
Remove any doubles (W / remove doubles)
Recalculate face normals (Ctrl+N)

great it works! thank you!