Backface problems

[legatus]

ok i have been trying to fix this problem for 2 days now and to no hope nothing has worked,
the poblem is like in 3dsmax when you apply a material to an object and dont click 2sided, when you do click 2 sided the object is fine, i think it has something to with backfaces or something similiar, i have tried using reversing option in 02 but every time i do another section of the model gets hidden even though i only seleced a single face.
ive attached a pic to help explain what i mean
http://legatuslegionis.homestead.com/files/prob.jpg

[Scorpio]

Not sure what you mean still... but if it helps, Copy and paste the model in the same position and press W for reverse. It'll increase the poly count though, so you're better off just remodelling the thing.

[scousejedi]

Things like this seem to happen when people use mirror in 3dmax and then import.

I would go to vertex mode and slowly select individual faces by selecting 3 (or 4) vertecies and press W

It might take ages but it will get the job done.

Using face select it will highlight all visible faces beneath the mouth. Vertex select is a lot slower but its more precise.