big problem
 

here is my pronlem...my head is transparent and i checked in the material attribute but transparent is normal.its not supose to be like that.i just uv map that head when i saw that i really dpnt kno how it hapened.

You must have turned on x-ray shading. Go to shading->x-ray. (something like that). It is on the viewports toolbar.

Shading -> Shade Options -> X-Ray

ok thanx a lot .i dotn know why i didnt think to that lol.