Check this one out
IronFace Mesh Lower Facemask Review - YouTube
Honestly, if you are really concerned about face shots than look at shemaghs like it was said before. Those things are not expensive and pretty universal, unless you are building specific impression and shemagh doesn't fit in it. Serious facial injuries are not common, at least where I play. BB hits are not as bad as one might think. Keep you mouth closed and your teeth will be fine.