I've recently started learning Blender and faced one problem.
After applying subdivision surface modifier I have plenty of extra faces.
I've watched some teaching videos and I suppose additional faces shouldn't be added.
Is it OK ? How to avoid this problem if it isn't.

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  • $\begingroup$ Have you tried bumping up the Merge limit in your mirror modifer? $\endgroup$ – Delagone Jan 26 '17 at 9:46
  • $\begingroup$ It's visible because you enabled the display modifier in viewport and Editmode. Maybe this answer or the manual helps. I also recommend to model with quads because tris (on the nose) and subsurf dont blend well. $\endgroup$ – Dan Jan 26 '17 at 11:00

I think you have some double vertices over there. shortcut W > remove doubles might solve your problem. Also try to keep faces as quads. Subdivision surface with triangles doesn't give optimal result.

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