Zbrush Face Model dis-apparent in Unity.

Hi, I've recently started modeling with Zbrush and I've edited one of the Default Face Models, I've Exported it to OBJ, and I Put it on Unity and the model Isn't There, It simply just doesn't show. No Matter the size, I've even looked at the Mesh in the Project panel, Nothing appears.So Because of that i tried Putting it in 3ds Max and th model works normally.just in Unity nothing appears and I Really Need help on this.

Chrifoldus

The vertex/poly count on ZBrush models can get really high, and I believe Unity will only handle meshes up to 65536 vertices. (You may have a warning in the error console when you try to import) If you dial down the sub-division in ZBrush and try to get the vertex count right down, Unity should then import it.